Subjects -> MANUFACTURING AND TECHNOLOGY (Total: 363 journals)
    - CERAMICS, GLASS AND POTTERY (31 journals)
    - MACHINERY (34 journals)
    - MANUFACTURING AND TECHNOLOGY (223 journals)
    - METROLOGY AND STANDARDIZATION (6 journals)
    - PACKAGING (19 journals)
    - PAINTS AND PROTECTIVE COATINGS (4 journals)
    - PLASTICS (42 journals)
    - RUBBER (4 journals)

CERAMICS, GLASS AND POTTERY (31 journals)

Showing 1 - 29 of 29 Journals sorted alphabetically
Advances in Applied Ceramics     Hybrid Journal   (Followers: 4)
Boletín de la Sociedad Española de Cerámica y Vidrio     Open Access   (Followers: 1)
Ceramics     Open Access  
Ceramics International     Hybrid Journal   (Followers: 26)
CeROArt     Open Access   (Followers: 1)
Challenging Glass Conference Proceedings     Open Access   (Followers: 1)
Crystal Growth & Design     Hybrid Journal   (Followers: 13)
Glass and Ceramics     Hybrid Journal   (Followers: 3)
Glass Technology - European Journal of Glass Science and Technology Part A     Full-text available via subscription   (Followers: 1)
International Journal of Applied Glass Science     Hybrid Journal   (Followers: 2)
International Journal of Ceramic Engineering & Science     Open Access  
Journal of Advanced Ceramics     Open Access   (Followers: 9)
Journal of Asian Ceramic Societies     Open Access  
Journal of Ceramics     Open Access   (Followers: 3)
Journal of Non-Crystalline Solids     Hybrid Journal   (Followers: 7)
Journal of Non-Crystalline Solids : X     Open Access  
Journal of the American Ceramic Society     Hybrid Journal   (Followers: 24)
Journal of the Australian Ceramic Society     Hybrid Journal  
Journal of The Chinese Ceramic Society     Open Access  
Journal of the European Ceramic Society     Hybrid Journal   (Followers: 16)
Journal of the Korean Ceramic Society : 한국세라믹학회지     Hybrid Journal  
Liquid Crystals Today     Hybrid Journal   (Followers: 1)
Molecular Crystals and Liquid Crystals     Hybrid Journal   (Followers: 1)
New Journal of Glass and Ceramics     Open Access   (Followers: 6)
Old Potter's Almanack     Open Access  
Open Ceramics     Open Access  
Powder Metallurgy and Metal Ceramics     Hybrid Journal   (Followers: 7)
Progress in Crystal Growth and Characterization of Materials     Full-text available via subscription   (Followers: 8)
Transactions of the Indian Ceramic Society     Partially Free   (Followers: 1)
Similar Journals
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Journal of the Korean Ceramic Society : 한국세라믹학회지
Number of Followers: 0  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1229-7801 - ISSN (Online) 2234-0491
Published by Springer-Verlag Homepage  [2469 journals]
  • Preparation, characterization, and photocatalytic degradation of methylene
           blue of SnO2/RGO nanocomposite produced by facile hydrothermal process

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      Abstract: Abstract A facile hydrothermal route has been used to produce a SnO2 (tin oxide)/RGO (reduced graphene oxide) nanocomposite. The microstructure and properties of the prepared nanocomposite were studied by an X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), Fourier transformed infrared (FTIR), UV–Vis analysis, and transmission electron microscope (TEM). The formation of SnO2 phase over RGO is confirmed by the XRD and FTIR results. The absence of a distinct peak of GO in the SnO2/RGO nanocomposite produced hydrothermally shows the reduction of GO to RGO completely. FE-SEM and TEM images show that SnO2 nanoparticles with size about 20 nm distributed homogeneously on the graphene surface. UV–Vis analysis of the SnO2/RGO sample exhibits broad absorption in the visible range (400–700 nm) indicating the SnO2 formation on the sheets of reduced graphene oxide. Moreover, the nanocomposite was employed as a photocatalyst under UV light irradiations to the removal of methylene blue (MB). The produced SnO2/RGO nanocomposite removes the absorption peak of MB at around 665 nm within 20 min, implying the nanocomposite possesses good photocatalytic efficiency under UV light irradiations.
      PubDate: 2022-05-10
       
  • Effect of LiBiO2 on low-temperature sintering of PZT-PZNN ceramics

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      Abstract: Abstract In this study, the sintering characteristics of 0.69Pb(Zr0.47Ti0.53)O3-0.31Pb[(Zn0.4Ni0.6)1/3Nb2/3] (PZT-PZNN) ceramics after the addition of LiBiO2 were studied. This addition lowered the sintering temperature from 1150 to 900 °C. The crystal structure changed from tetragonal to rhombohedral as the additive content increased by 0.7%. The polarization of the sintered specimen was conducted at an electric field of 3 kV/mm. When 0.7 wt% of LiBiO2 was added and sintered at 900 °C, the piezoelectric constant (d33) was 602 pC/N; moreover, the electromechanical coupling coefficient (kP), sintered density, and Curie temperature (Tc) at 1 kHz were 66.3%, 7.99 g/cm3, and 252.8 °C, respectively. When 0.7 wt% of LiBiO2 was added, the PZT-PZNN ceramic showed an increased strain curve of 0.118% at 2 kV/mm. The interdiffusion between the copper (Cu) electrode and ceramic material was not observed in the scanning electron microscopy (SEM) results; thus, the possibility of manufacturing an actuator using a Cu electrode using a novel composition was confirmed. The actuator displacement with the voltage 400 V was 1.2 μm. The thickness of the multi-layered actuator was 1 mm. Through this, the possibility of manufacturing a multi-layered actuator with a Cu electrode was confirmed through the composition of 0.69PZT-0.31PZNN (LiBiO2 0.7 wt%).
      PubDate: 2022-05-04
       
  • Production of high-quality glass foam from soda lime glass waste using
           SiC-AlN foaming agent

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      Abstract: Abstract This research presents the possibility of producing durable foam glasses from glass cullet using SiC/AlN foaming agent. The foaming agent generated by the SiC and AlN couple results in a more homogeneous microstructure and thus the emergence of foam glasses with better properties compared to the nitride foaming agent used alone in our previous work. The fabricated foam had a crack-free, 3-D cellular structure with macropores whose geometries varied between elliptical-, pentagonal-, and hexagonal-shaped constructions. It also had a lightweight (≥ 0.18 g/cm3), high cold crushing strength (≤ 4.5 MPa), low thermal conductivity (0.09–0.16 W/m K), and contained more than ~ 89 vol.% gas bubbles enclosed between 11 vol.% impervious glass walls. The properties accomplished by the foam prepared in this work conform with the requirements of international standard for commercial glass foams, demonstrating its strong capability to be utilized in potential applications in sustainable buildings and energy efficiency in industry.
      PubDate: 2022-05-02
       
  • Dielectric properties of silicon-doped α-alumina derived from
           sol–gel process

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      Abstract: Abstract In this study, silicon-doped alumina (Al2O3) was synthesized using the sol–gel method. The composition and structure of silicon-doped alumina were analyzed using thermogravimetric-differential thermal analysis, X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy. As a result, it was found that the particle size of the silicon-doped alumina was uniform, and the silicon doped in the α-Al2O3 lattice occupied the space of the oxygen octahedron to form a structure based on the Al–O–Si bond. Also, because of measuring the change in dielectric constant according to the amount of doped silicon, a value of the dielectric constant of 3.1 at 1 GHz frequency when the silicon doping amount was 2%. Therefore, it is thought to be applicable to the fields of microelectronics, electronic packaging and interconnection, small antenna arrays, and capacitors that require low-k materials.
      PubDate: 2022-05-02
       
  • Progress and perspectives of metal-ion-substituted hydroxyapatite for bone
           tissue engineering: comparison with hydroxyapatite

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      Abstract: Abstract Hydroxyapatite (HA) is one of the most common bioceramics and is abundant in human bones. HA is composed of calcium phosphate, which is prevalent in biomedical processes, particularly bone formation, osteogenesis, and angiogenesis. As HA is one of the core materials that makes up the human body, there has been considerable research on methods of synthesizing HA while changing its properties by substituting various types of metal ions. In particular, previous studies have intensively investigated the size, crystallinities, and morphologies generated using various synthesis methods to change the characteristics of HA by substituting different metal ions. This review summarizes the findings of these studies on HA, including findings on the characteristics of HA in natural bone, methods of synthesizing HA, and findings on metal-ion-substituted HA. Furthermore, the characteristics and applications of HA that were investigated in previous studies are summarized, and the latest trends and perspectives on the future of the field are also presented.
      PubDate: 2022-05-02
       
  • Effect of heat treatment on the wear behavior of WC-Ni-Cr and
           

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      Abstract: Abstract In this study, a tungsten carbide (WC)-Ni-Cr composite and a coating composition of Cr3C2 in WC-Ni-Cr were selected and fabricated using a high-velocity oxy-fuel (HVOF) method, to explore their applicability as wear-resistant coatings on cast iron substrates used in automotive brakes. Furthermore, to investigate the effect of post-annealing on the wear performance of the coatings, the coated samples were heat-treated at 500 and 850 °C. The microstructure, phase formation behavior, composition, and wear rate of the coated samples and post-annealed coatings were analyzed. Furthermore, the wear characteristics of the coatings were analyzed using a ball-on-disk method with a Si3N4 ball. By comparing the wear and friction characteristics of each coating, before and after heat treatment, the wear resistance performance of the coating could be related to the surface oxidation caused by heat treatment. In summary, the oxidation and phase change caused by the heat treatment reduced the wear resistance; however, if appropriate heat treatment conditions are satisfied, the frictional force required for automotive braking can be increased. Furthermore, the WC-Ni-Cr + Cr3C2 coating, where Cr3C2 was added to WC-Ni-Cr, exhibited an improved wear resistance compared to the coating with only WC-Ni-Cr. This was predicted to be an enhancement effect produced by the addition of Cr3C2.
      PubDate: 2022-04-27
       
  • Enhanced photocatalytic activity of CuxNi1−xFe2O4 -rGO composite

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      Abstract: Here in this article, we reported the effect of divalent metal cations Cu2+ on photocatalytic properties of spinel nickel ferrite (NiFe2O4). Copper substituted, and unsubstituted nickel ferrite particles were prepared by a wet chemical route. X-ray diffraction (XRD) and Raman spectroscopy confirmed the successful formation of Cu-NiFe2O4 and their composite with reduced graphene oxide (rGO). The rGO was used as conducting matrix as well as to enhance the catalytic sites on the surface of copper substituted nickel ferrites. The scanning electron microscopy (SEM) was used to confirm the preparation of Cu-NiFe2O4/rGO nanocomposite. The enhanced surface area of the prepared nanocomposite showed a drastic increase in their photocatalytic property. It was observed that photocatalytic activity of nickel NiFe2O4 was enhanced up to about 30% when the crystal lattice of pure nickel ferrite was substituted by divalent copper metal ions. The Cu-NiFe2O4/rGO nanocomposite exhibited much higher degradation efficiency as compared to bare NiFe2O4. The photocatalytic activity of prepared copper substituted nickel ferrite, and their nanocomposite with reduced graphene oxide was further confirmed by electrochemical measurements. These included the electrochemical impedance spectroscopy, photocurrent response, and Mott–Schottky measurements. Graphical abstract
      PubDate: 2022-04-27
       
  • Structural, spectral, dielectric and magnetic properties of
           Co–Cr-substituted hexagonal ferrites with X-type structure

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      Abstract: Abstract Co2+ and Cr3+-substituted SrBaCu2-xCoxCryFe28-yO46 X-type hexaferrite with x = y = 0, 0.1 to 0.5 (step = 0.1) were prepared through auto-combustion sol–gel method and sintered at 1250 °C for 5 h which was found from thermal analysis. The thermal investigation, phase detection, spectral, magnetic, and dielectric characteristics of the prepared composition were investigated by TGA, XRD, FTIR, VSM, and dielectric measurement. XRD patterns of the entire composition confirmed the development of a single phase of X-type structure. The enhancement in the lattice parameters and cell volume was observed by varying the Co–Cr concentration, attributed to the larger ionic radii substitution. FTIR\spectra of all samples exhibit two absorption peaks in the wavenumber range of 500–550 cm−1 and 418–425 cm−1 that confirm the formation of hexaferrite. The dielectric properties have been inspected based on frequency and substitution variation in the sample. The dielectric constant exhibits the increasing trend with the Co–Cr ratio. The enhancement in Ac conductivity was also found by increased substitution ions. Single semi-circles were examined in Nyquist plots, attributed to the contribution of the grain boundaries. Detailed magnetic parameters such as saturation magnetization, remanence, squareness ratio, coercivity, and magneto-crystalline anisotropy constant were measured. By the increase in Co–Cr substitution the increased of saturation magnetization (Ms) from 61.12 emu/g to 64.89 emu/g, the remanence (Mr) from 27.43 emu/g to 30.71 emu/g, and coercivity (Hc) from 1654.56 Oe to 1863.54 Oe was found. Therefore, the synthesized SrBaCu2 X-type hexagonal ferrites with the appropriate amount of Co–Cr substitution are suitable candidates for microwave devices and valuable in longitudinal recording media.
      PubDate: 2022-04-20
       
  • Investigating biological impact of HAp from goat femur reinforced with
           Zr–Ag for bone tissue engineering application

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      Abstract: Abstract In this study, the different weight percentages of ZrO2–Ag-reinforced HAp were prepared by the planetary mill and calcinated at 800 °C for 5 h. Synthesized nano-composites evolved the hexagonal phase of HAp in addition to ZrO2 and Ag peaks. Raman spectroscopy confirmed the high-intensity band of PO4−3 group and major bands of Zr and Ag. Staphylococcus epidermidis and Pseudomonas aeruginosa bacterial growth were arrested in HA20Zr10Ag nano-composites evaluated by in vitro antibacterial activity. Hemocompatible behavior of the reinforced HAp revealed that the nanocomposites was non-hemolytic with distinct RBC morphology and this effect was more pronounced while increasing ZrO2 concentration. Biocompatibility studies, such as protein adsorption, cell viability, fluorescence staining, mineralization, and quantification of BMP-2, were analyzed with MG-63. The nanocomposites have adsorbed a high amount of proteins (~ 300 to 700 µg) from the serum. MTT assay revealed the percentage of the viability of the cells was ~ 70% to 80%. In vitro cytotoxic behavior of MG-63 cells illustrated that HA20Zr10Ag nanocomposites expressed polygonal structure with elongated morphology by Alexa Fluor 488 phalloidin and DAPI staining. Similarly, nano-composites powder proved its mineralization capability through intracellular calcium uptake up to the 5th day of MG-63 incubation. While, BMP-2 expression was slightly higher in HA20Zr10Ag nano-composite at 5th day of incubation. From the results, it is illustrated that HAp with 20 wt% of ZrO2 and 10 wt% Ag nanocomposites has an important role in osteoblastic bone formation.
      PubDate: 2022-04-20
       
  • Tuning the photoluminescence spectral properties of Ce and Sm co-doped YAG
           ceramic for optical applications

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      Abstract: Abstract This work reports on the luminescence properties of cerium and samarium co-doped in yttrium–aluminum–garnet ceramic. Single and co-doped YAG nanocrystals have been prepared at different contents of Ce ions. The X-ray diffraction (XRD) confirms the formation of the crystallites and the phase purity. The ceramic has been fabricated by sintering using spark plasma sintering technique. It is found that the photoluminescence (PL) spectral features of ceramic sample are strongly dependent on the excitation wavelength. Broad emission band from Ce3+, is superimposed with the emission lines from Sm3+, thanks to significant spectral overlapping of their excitation lines. Consequently, the emitted color parameters can be widely controlled, as demonstrated from the chromaticity diagram. In addition, cathodoluminescence (CL) has been performed and evidenced the superimposed CL signal from both ions. Moreover, the time-resolved photoluminescence (TRPL) result indicates the influence of such spectral overlapping on the luminescence decay kinetics.
      PubDate: 2022-04-20
       
  • Green synthesis and characterization of Ag-doped ZnO nanofibers for
           photodegradation of MB, RhB and MO dye molecules

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      Abstract: Abstract In this study, silver (Ag)-doped zinc oxide (ZnO) nanofiber photocatalysts were synthesized using electrospinning method. To understand the effect of Ag doping on the photocatalytic efficiencies, ZnO nanofibers were prepared with different loading ratios (0, 0.3, 0.5, 1.0 at.% Ag). The synthesized nanofibers were characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), ultraviolet–visible (UV–Vis) spectroscopy and photoluminescence (PL) spectroscopy techniques. The photocatalytic performances of the fibers were first evaluated by measuring the photodegradation of methylene blue (MB) under the UV light irradiation. It was found that the amount of dopant ions has a crucial effect on the degradation process of MB. The results show that 0.5 at.% Ag dopant dosage is the ideal to achieve maximum catalytic efficiency against MB dye molecules with nearly complete decolorization just after 75 min UV light irradiation. During the degradation process, the substitutional incorporation of dopant ions provides better photocatalytic efficiency due to forming higher number of charge carriers and so delaying the recombination process. The recycling experiments for MB dye degradation were performed to determine the conservation of the catalytic efficiency and chemical stability of the nanofibers. To compare the photocatalytic efficiency of nanofibers against different dye molecules, the degradation performance of 0.5 at.% Ag-doped ZnO nanofibers was also experimentally examined by the measuring the photocatalytic degradation rates of various harmful organic dyes such as Rhodamine B (RhB) and methylene orange (MO) under the UV light irradiation. It was found that the photodegradation rates of RhB and MO synthetic dye solutions are determined as follows: ~ 66% and ~ 51% decomposition after 120 min UV light irradiation, respectively. A possible mechanism for the improvement of the photocatalytic performance of ZnO nanofibers by Ag loading is proposed.
      PubDate: 2022-04-13
       
  • Electrochemical characteristics of La0.8Sr0.2MnO3
           (LSM)–scandia-stabilized zirconia (ScSZ) composite cathode

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      Abstract: Abstract LSM–ScSZ composite electrode for solid oxide fuel cells (SOFCs) cathode application has been investigated for its oxygen reduction reaction (ORR) performance. The composition and sintering temperature of LSM–ScSZ were controlled to determine the optimized microstructure of the LSM–ScSZ electrode layer, considering its length of triple-phase boundaries (TPBs), and transfer of oxygen for cathode reaction. The electrochemical impedance spectroscopy (EIS) method with an equivalent circuit model was introduced to characterize the specific impedance of each sample. The results demonstrated that volume ratio of LSM:ScSZ = 6:4 sintered at 1200 °C sample showed the lowest total impedance of 0.031 Ω cm2 at 900 °C operating temperature, compensating slightly increased high-frequency impedance (RHF) of TPBs region with drastically improved the active surface of LSM area and their connectivity, which correspond to middle- and low-frequency impedance (RMF and RLF) value, respectively. This study suggests an integrated approach in the development of the SOFCs cathode design with the proper compositional ratio and sintering process via using commercial materials.
      PubDate: 2022-04-12
       
  • A new design of SiO2–Na2O–Al2O3 glass–ceramic and determination of
           elastic modulus and density of states via molecular dynamics simulations
           based on density functional tight-binding calculations

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      Abstract: Abstract In this study, the SiO2–Na2O–Al2O3 system was designed by a quantum mechanical method based on density functional theory (DFT). The Na2O and Al2O3 were located on specific sites of silika (SiO2) structure. The geometrical optimization was applied to the system through self-consistent charge density functional tight binding (SCC-DFTB) to obtain the most stable structure. SCC-DFTB based molecular dynamics (MD) method was performed to create a SiO2–Na2O–Al2O3 glassy structure. In this context, the temperature of the model system was dropped from 2000 to 300 K with a high cooling rate and the model system was waited at 300 K for relaxation of the glassy structure. For understanding the glass–ceramic formation, the structural characterization was analysed by partial radial distribution function (RDF). The elastic modulus and total density of states (DOS) were calculated for realizing the mechanical and electronic properties of system. As a result, these results can provide a reference for modeling SiO2–Na2O–Al2O3 glass–ceramic.
      PubDate: 2022-04-12
       
  • Effects of di-ammonium citrate: polyvinylpyrrolidone as a complexion
           dispersants on 3Y-TZP slurries and sintered body properties

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      Abstract: Abstract A wide application of 3 mol% Yttria-stabilized Tetragonal Zirconia Poly-crystalline (3Y-TZP) makes the concern of ceramic processing required to produce strong and reliable engineering ceramic products. In this study, we successfully improved the 3Y-TZP mechanical properties by paying great concern to the early processing of 3Y-TZP powder. Here, we used the concept of colloidal processing by manipulating the 3Y-TZP inter-particle force as a combination of steric and depletion stabilization. Di-ammonium citrate (DAC) was used to induce steric stabilization utilizing the DAC’s carboxyl group to strongly bond with the OH group of the 3Y-TZP. While Polyvinylpyrrolidone (PVP) which could not bond with 3Y-TZP, leaves it freely as an un-attached polymer in slurries and induces a depletion stabilization mechanism. Using the combination of steric and depletion stabilization, the YSZ slurries stability is improved, and a uniform and smaller particle size can be obtained. As the result, better microstructure and high mechanical properties of the sintered body, such as higher density and Vickers hardness, can be achieved. By comparing to the sintered body of 3Y-TZP containing just DAC and 3Y-TZP containing a combination of DAC and PVP, better-sintered body properties can be found for the 3Y-TZP containing the combination of DAC and PVP, and the results can be listed as follows: grain size reduced from 0.420 to 0.281 um, density is increased from 94.5 to 99.3%, and Vickers hardness increases from 1190 to 1305 HV.
      PubDate: 2022-04-10
       
  • Tailoring the characteristics of CeO2 nanoparticles doped ZrC
           nanostructures for photodetectors nanodevices

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      Abstract: Abstract Thin films of CeO2/ZrC ceramics nanostructures were fabricated using spray pyrolysis technique due to economy method, simple, easy fabrication and high equity. The CeO2 thin films were synthesized with various contents (0.02, 0.04, 0.06 and 0.08)g/25 ml. The ZrC NPs have been added to the CeO2 nanoceramics with ratios are 12.5%, 25% and 37.5% by different concentrations are (0.02, 0.04, 0.06 and 0.08) g/25 ml. Structure and optical characteristics of CeO2/ZrC ceramics nanostructures were studied. Structure characteristics were examined using the optical microscope (100×). Optical characteristics were tested in the wavelength (300–800) nm. The results indicated that the absorption and optical conductivity CeO2 nanostructure were increased with the increase in ZrC nanostructure content. The absorption increased about 30.8% and optical conductivity increased about 17.3%. The energy gap of CeO2 nanostructure was decreased with rise in the ZrC NPs content about 34.5%. In addition, the electrical conductivity of CeO2 was rise as the ZrC NPs ratio rise. The final results showed that the CeO2/ZrC ceramics nanostructures can be utilized for various fields in the electronic and photonics applications.
      PubDate: 2022-04-08
       
  • Effects of impurities on the slip viscosity and sintered properties of
           low-soda easy-sintered α-alumina

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      Abstract: Abstract The effects of the impurity on the rheological behavior of the aqueous slip and the resulting sintering properties of low-soda easy-sintered alumina were examined. The addition of Na+, Ca2+, Mg2+, Fe3+, and Si4+ resulted in a change in slip viscosity, where Na+ and Mg2+ increased the viscosity significantly. On the other hand, the changes in the zeta potential of the particles upon impurity addition were insignificant. The addition of Mg2+ and Fe3+ revealed a denser sintered microstructure along with more uniform grain sizes, whereas Na+, Ca2+, and Si4+ addition resulted in a lower sintered density and abnormal grain growth compared to those of the as-received powder. Overall, the impurity affected the slip viscosity and sintered microstructure of alumina significantly, while the color difference of sintered sample existed in two kinds of powders was difficult to explain only using the type and content of impurities.
      PubDate: 2022-03-28
       
  • Synthesis and characterization of Cr substituted Mn–Zn nanoferrites with
           improved dielectric, electrical conductivity and impedance properties for
           electronic device applications

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      Abstract: Abstract In the present study, the impact of Cr ion substitution on Mn–Zn soft nanoferrites has enhanced the dielectric, electrical conductivity, and impedance properties. The nanoferrites have been synthesized via a non-conventional wet chemical-based co-precipitation technique. Raman scattering confirms the spinel nature and also reveals a positive frequency shift with the Cr ion substitution. As Cr ion concentration increases, the dielectric constant (ε′) increases significantly at room temperature. At 100 Hz, x = 0.5 [Mn0.5Cr0.5Fe2O4] resulted in higher value of ε′ ~ 104 and a lower value of loss (tan δ) ~ 3.9. Frequency modulated ac conductivity rises with increasing Cr substitution in Mn–Zn nanoferrites. Electric modulus, impedance spectra, and conduction nature were found to improve with increasing Cr ions. The Nyquist plot shows two semicircle responses in the high and mid-frequency regions, which is due to a conduction mechanism of charges (Fe2+ ↔ Fe3+) that is related to bulk grains and grain boundary contribution, respectively. High dielectric constants and minimum electric loss in soft nanoferrite materials are useful for electronic device applications.
      PubDate: 2022-03-28
       
  • Correction to: Energy materials for energy conversion and storage: focus
           on research conducted in Korea

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      PubDate: 2022-03-10
       
  • Effects of sintering temperature and zirconia content on the mechanical
           and microstructural properties of MgO, TiO2 and CeO2 doped
           alumina–zirconia (ZTA) ceramic

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      Abstract: Abstract The effects of sintering temperature and ZrO2 addition on the hardness and fracture toughness of zirconia toughened alumina (ZTA)–MgO–TiO2 composite was investigated. 5 wt.% CeO2 was added to ZTA containing 5 wt.% of MgO and 5 wt.% of TiO2. Two sets of composition A5ZMTC and A15ZMTC were used consisting of 5 wt.% and 15 wt.% of 3YSZ, respectively, to analyze the effect of CeO2 on the base composition. The powders were pressed into pellets and sintered at different temperatures of 1450 °C, 1500 °C, 1600 °C and 1650 °C for 3 h. Density, hardness and fracture toughness increased to a maximum value and then decreased. From the XRD analysis, Ce0.7Zr0.3O2 in only A5ZMTC and CeAl11O18 in only A15ZMTC are evident. The highest fracture toughness of 12.03 MPam1/2 (Casellas) was achieved at 1500 °C in A15ZMTC and maximum hardness of 14.15 GPa was obtained in A5ZMTC sintered at 1450 °C.
      PubDate: 2022-03-09
       
  • Dielectric, electrical and optical properties of aluminosilicate ceramics
           synthesized by solid-state reaction route

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      Abstract: Abstract The conventional high-temperature solid-state reaction technique is used to synthesize aluminosilicate ceramics of three different compositions (Al0.70Si0.30O, Al0.73Si0.27O, Al0.75Si0.25O). These aluminosilicate ceramics are systematically investigated by XRD, FTIR, SEM, dielectric, electrical, and UV–visible analysis. The polycrystalline ceramics are well synthesized at a sintering temperature of 1450 °C, confirmed from XRD studies. The IR interferogram reveals the presence of mullite (3Al2O3⋅2SiO2)-type molecules in these aluminosilicate ceramics. The SEM images show the formation of homogeneous microstructures with appreciable density. The room temperature dielectric constant values for Al0.70Si0.30O, Al0.73Si0.27O, Al0.75Si0.25O ceramics are 1.5, 1.8, and 1.7 at 1 MHz frequency with dielectric loss values of 0.02, 0.04, and 0.06 respectively. The ac conductivity spectrum of these samples obeys the Arrhenius equation and the classical correlated barrier hopping model governs the conduction mechanism in these ceramics. Complex impedance analysis confirms the contribution of both grain and grain boundary towards transport processes in these ceramics. The UV–visible spectrum reveals that the synthesized ceramics, Al0.70Si0.30O, Al0.73Si0.27O, and Al0.75Si0.25O have a wide-band-gap of the order of 3.45 eV, 3.42 eV, and 3.39 eV respectively. These ceramics can be preferably used as electronic substrates, packaging material for high-frequency circuits, and infrared transmitting window materials.
      PubDate: 2022-03-04
      DOI: 10.1007/s43207-022-00193-1
       
 
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