Subjects -> EARTH SCIENCES (Total: 771 journals)     - EARTH SCIENCES (527 journals)    - GEOLOGY (94 journals)    - GEOPHYSICS (33 journals)    - HYDROLOGY (29 journals)    - OCEANOGRAPHY (88 journals) EARTH SCIENCES (527 journals)            First | 1 2 3
 Showing 401 - 371 of 371 Journals sorted alphabetically Physical Geography       (Followers: 8) Physical Science International Journal Physics in Medicine & Biology       (Followers: 15) Physics of Life Reviews       (Followers: 1) Physics of Metals and Metallography       (Followers: 18) Physics of Plasmas       (Followers: 10) Physics of the Earth and Planetary Interiors       (Followers: 34) Physics of the Solid State       (Followers: 4) Physics of Wave Phenomena Physics World       (Followers: 18) Physik in unserer Zeit       (Followers: 9) Pirineos Planet       (Followers: 4) Plasma Physics and Controlled Fusion       (Followers: 6) Plasma Physics Reports       (Followers: 7) Polar Record       (Followers: 2) Positioning       (Followers: 4) Pramana       (Followers: 13) Precambrian Research       (Followers: 7) Preview Proceedings of the Geologists' Association       (Followers: 6) Proceedings of the Linnean Society of New South Wales       (Followers: 2) Proceedings of the Yorkshire Geological Society       (Followers: 1) Progress in Earth and Planetary Science       (Followers: 15) Pure and Applied Geophysics       (Followers: 12) Quarterly Journal of Engineering Geology and Hydrogeology       (Followers: 4) Quaternary Quaternary Australasia Quaternary Geochronology       (Followers: 8) Quaternary International       (Followers: 14) Quaternary Research       (Followers: 19) Quaternary Science Advances Quaternary Science Reviews       (Followers: 26) Radiocarbon       (Followers: 12) Remote Sensing       (Followers: 57) Remote Sensing Applications : Society and Environment       (Followers: 9) Remote Sensing in Earth Systems Sciences       (Followers: 5) Remote Sensing Letters       (Followers: 45) Remote Sensing Science       (Followers: 29) Rendiconti Lincei Reports on Geodesy and Geoinformatics       (Followers: 8) Reports on Mathematical Physics       (Followers: 2) Research & Reviews : Journal of Space Science & Technology       (Followers: 18) Resource Geology       (Followers: 6) Resources, Environment and Sustainability       (Followers: 1) Results in Geochemistry Results in Geophysical Sciences Reviews in Mineralogy and Geochemistry       (Followers: 4) Reviews of Modern Physics       (Followers: 31) Revista Cerrados Revista de Ciências Exatas Aplicadas e Tecnológicas da Universidade de Passo Fundo : CIATEC-UPF Revista de Ingenieria Sismica Revista de Investigaciones en Energía, Medio Ambiente y Tecnología Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales Revista de Teledetección Revista Geológica de Chile Revue Française de Géotechnique Rock Mechanics and Rock Engineering       (Followers: 7) Rocks & Minerals       (Followers: 3) Russian Geology and Geophysics       (Followers: 2) Russian Journal of Mathematical Physics Russian Journal of Pacific Geology Russian Physics Journal       (Followers: 1) Science China Earth Sciences       (Followers: 3) Science News       (Followers: 11) Science of Remote Sensing       (Followers: 7) Scientific Annals of Stefan cel Mare University of Suceava. 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Similar Journals
 Physics of the Solid StateJournal Prestige (SJR): 0.415 Citation Impact (citeScore): 1Number of Followers: 4      Hybrid journal (It can contain Open Access articles) ISSN (Print) 1090-6460 - ISSN (Online) 1063-7834 Published by Springer-Verlag  [2469 journals]
• Josephson Tunnel Junctions with an Integral
Superconductor–Insulator–Normal Metal Shunt

Abstract: This study is devoted to the investigation of tunneling superconductor–insulator–superconductor (SIS) Josephson junctions with a new type of shunt based on an additional superconductor–insulator–normal metal (SIN) junction placed around the SIS junction. In the course of study, the parameters of such shunted junctions are numerically calculated and their current–voltage characteristics (IVC) are simulated. The designed structures are assembled in real samples and their parameters are studied; the IVC of junctions with different degrees of shunting are measured, and the behavior of these junctions under the influence of high-frequency signals in the subterahertz range is studied.
PubDate: 2022-09-09

• Phase Transitions in the Diluted Two-Dimensional Potts Model with the
Number of Spin States q = 3 on a Square Lattice

Abstract: The phase transitions in the two-dimensional diluted Potts model with the number of spin states q = 3 are studied by computer simulation method. The systems with linear sizes L × L = N, L = 10–160 at spin concentrations p = 1.00, 0.80 are considered. The obtained numerical data show that the second-order phase transition takes place in the pure Potts model with the number of spin states q = 3, according to the theory. The introduction of a disorder in the form of nonmagnetic impurities (p = 0.80) in the Potts model with q = 3 conserves the second-order phase transition.
PubDate: 2022-09-09

• Lattice Dynamics of BCC Titanium and Its Nonlinear Response to High
Temperature Deformations in Ab Initio Molecular Dynamics

Abstract: Using the ab initio molecular dynamics method, the dynamics of the bcc titanium lattice and its response to high temperature deformations are studied. The results of calculation of phonon spectra with use of the harmonic Hamiltonian and the Hamiltonian containing third-order force constants are compared. It is shown that the lattice dynamics of bcc titanium cannot be correctly described without taking into account the anharmonic terms. Stress–strain curves are calculated for specified deformation scheme η1 = η11 = η, η6 = 2η12= η. Analytical expressions of the dependence of the nonzero components of the stress tensor on the strain magnitude are given for this deformation scheme, which take into account the elastic constants up to the fourth order inclusive. All second-order elastic constants, three third-order elastic constants, and four fourth-order elastic constants of bcc titanium are calculated.
PubDate: 2022-09-09

• Point Defects of Bismuth in TlInTe2 Crystals: Electrophysical and
Dielectric Properties of Solid Solutions

Abstract: The TlInTe2–Bi phase diagram was studied in the concentration region of 0–10 at % of Bi by complex methods of physicochemical analysis, and the bismuth solubility in TlInTe2 at room temperature was established to be 5 at %. The electrophysical and dielectric properties of (TlInTe2)1 – xBix solid solutions were studied. Using the (TlInTe2)1 – xBix composition, where x = 0.05, as an example, bismuth impurities were shown to increase the conductivity in direction (001), change the hole conductivity of a TlInTe2 crystal for electron type, and strongly increase the electric anisotropy of a TlInTe2 crystal ρ⊥/ρ by more than 103 times. The effect of bismuth impurities on the dielectric properties of TlInTe2 crystals was also observed. Bismuth impurities formed barriers on the migration way of thallium ions and increased the temperature Ti of phase transition into the ion-conducting phase by 69 K in crystallographic direction [001] and 87 K in direction [110].
PubDate: 2022-09-09

• Phonon Spectrum of La2Ge2O7: Ab Initio Calculation

Abstract: Within the density functional theory, ab initio calculation of the crystal structure, phonon spectrum, and elastic properties of lanthanum germanate La2Ge2O7 with triclinic structure (space group $$P\bar {1}$$ , no. 2). Frequencies and types of fundamental vibrations are determined. The degree of involvement of ions in each mode is determined by analyzing calculated displacement vectors. The calculations are performed for the first time. Experimental data on IR and Raman spectra, as well as elastic constants of La2Ge2O7 are absent in the literature. The program CRYSTAL17 intended for ab initio calculations of periodic structures within the MO LCAO (molecular orbital as a linear combination of atomic orbitals) approach is used.
PubDate: 2022-09-09

• Binary and Ternary Alloy Nanowires: Correlation of Structural and Magnetic
Properties

Abstract: Several types of nanowires from alloys of various compositions obtained by the method of matrix synthesis based on track membranes are investigated in this study. Electrolytes are selected to obtain nanowires of the desired composition. The control of electrodeposition by chronoamperograms has made it possible to systemically vary the geometric parameters and morphology. The topographies of the resulting nanowire arrays and their elemental composition are studied using electron microscopy with an X-ray spectral analyzer. The magnetic properties of the samples (hysteresis loops and the coercive force and residual magnetization values) are measured on a vibrating magnetometer. The structures of binary alloys are studied, and the dependence of the coercive force on the composition is analyzed for nanowires of FeCo alloys. The resulting dependence has two maxima (the coercive force is about 300 Oe) at an equiatomic composition and at a cobalt content of about 90%. For Fe0.3Co0.7 nanopowders, the dependence of the coercive force on the diameter is studied, and a sharp increase in the former from 200 to 1300 Oe is found with a decrease in the nanowire diameter from 100 nm to 30 nm, respectively. The increase in the coercivity with a decrease in the diameter is caused by the formation of single-domain crystallites, the processes of magnetization reversal of which are associated with uniform rotation of the magnetization. For nanowires made of FeNi alloys, the effect of the aspect ratio on the coercive force is revealed. As found from the results of studying ternary alloys of the FeCoCu system, the addition of copper substantially increases the coercive force, which reaches a maximum (500 Oe) at a copper content of about 5%. The obtained X-ray diffraction data suggest that the effect of an increase in the coercive force is associated with the formation of fine-grained inclusions based on copper, which leads to effective retardation of domain walls. The obtained data expand the range of possibilities for controlling the magnetic properties of NW arrays prepared by template synthesis.
PubDate: 2022-09-09

• Mechanisms of Magnetoelectric Effects in Oxide Multiferroics with a
Perovskite Praphase

Abstract: Magnetoelectric effects in multiferroics with a perovskite structure, such as bismuth ferrite, rare-earth orthochromites, and Ruddlesden–Popper structures belonging to the trigonal, orthorhombic, and tetragonal systems are discussed. The influence of structural distortions on magnetic and ferroelectric properties is studied; possible magnetoelectric linear, quadratic, nonuniform effects are determined in these materials; and the expressions for the linear magnetoelectric effect tensor are presented. The macroscopic manifestations of the nonuniform magnetoelectric effect in nanoelements based on multiferroics are considered.
PubDate: 2022-09-09

• Specific Features of Synthesis, Structure, Magnetometry, and NMR
Spectroscopy of Different-Type Nanowires

Abstract: Nanowires of different types (homogeneous (made of iron) and heterogeneous (layered)), obtained by the template synthesis method, have been investigated. A technique for preparation of layered nanowire arrays with alternating thin layers of magnetic and nonmagnetic metals (Co/Cu and Ni/Cu) has been developed and described. Microscopy methods (SEM and TEM with elemental analysis) are used to study topography of the obtained structures, nanowire diameters, individual-layer thicknesses, and specific features of layer interfaces. Several ways of synthesis of nanowires with thin layers and sharp interfaces are proposed: dilution of electrolyte, use of a reference electrode, and monitoring of the charge passage. Layered nanowires are investigated by magnetometry; it is shown that the magnetic properties of a layered nanowire array (in particular, direction of the easy magnetization axis in the Co/Cu nanowire array) depend not only on the aspect ratio of the magnetic layer but also on the thickness ratio between the magnetic-metal layer and the nonmagnetic spacer (copper interlayer). Nanowires of the two types are studied using the nuclear magnetic resonance (NMR) method. Layered Co/Cu structures are analyzed by 59Co NMR: it is shown that nanowires with smaller-thickness layers (and, accordingly, with a larger contribution from the interfaces) are characterized by a larger fraction of Co atoms coordinated by Cu atoms. The large fraction of the Cu-coordinated atoms suggests that copper impurity enters cobalt layers. Homogeneous nanowires made of iron are compared with bulk iron samples (57Fe NMR). The line is found to be shifted to higher frequencies (by 0.3 MHz), which is indicative of an increase in the field by about 0.2 T. A significant line broadening and a decrease in the spin–lattice relaxation time may indicate that there is a large dispersion between the local magnetic field values.
PubDate: 2022-09-09

• Influence of Transverse π–π-Bridging on Formation Properties of
High-Modulus Carbon Nanotube Fibers

Abstract: A theoretical model that interprets the increase in the elastic modulus of carbon nanotube fibers upon the formation of π–π cross links between individual nanotubes in the fiber is proposed. It is shown that the following three factors affect the elastic modulus of a fiber: the elastic modulus of the initial nanotubes; the degree of interaction between individual nanotubes in the fiber; and its aspect ratio, i.e., the ratio of the fiber length to its diameter. At the point of transition of these interactions from repulsion to attraction, the elastic modulus of the fiber reaches the corresponding value for an individual carbon nanotube and exceeds it in the region of attractive interactions. The basic factor for the rigidity of carbon nanotube fibers is their structure, which is characterized by fractal dimension.
PubDate: 2022-08-10

• Graphene/Nanotube Quasi-1D-Structures in Strong Electric Fields

Abstract: Energetically stable atomistic models of graphene/nanotube quasi-one-dimensional (1D) structures based on the chiral carbon nanotube (6,5), graphene nanoribbons, and graphene flakes are constructed. In silico studies of the density distribution of the electron charge, band structure, and conductance of quasi-1D-structures are performed. It was found that, in contrast to nanotubes and graphene, the transmission function of quasi-1D-structures has an intensity peak at the Fermi level. The effect of strong electric fields of 107–108 V/cm on the atomic and electronic structure of quasi-1D-structures is also studied. As a result of quantum molecular-dynamics simulation, systematic features of atomic core deformation and destruction under a ponderomotive force are determined. A critical strength at which electric field detaches graphene from a tube is determined. It is ~2 × 108 V/cm. A further increase results in graphene detachment from a tube with its simultaneous fracture.
PubDate: 2022-08-10

• Microstructure and Physical and Mechanical Properties of the Al90Gd10
Binary Alloy after Barothermal Treatment

Abstract: Using the microindentation, X-ray diffraction, optical microscopy, and electron microscopy methods, the microstructure and bulk physical and mechanical properties (hardness, reduced elastic modulus, plasticity index, elastic recovery parameter) of two samples of the Al90Gd10 binary hypereutectic alloy (hereinafter, formula indices correspond to at %) are studied. The first sample is obtained by rapid cooling of the melt at a rate of 1000 degree/s at a high pressure of 10 GPa; the hardening temperature is 1800 K. The second sample is obtained by pressing the original sample with a high pressure of 5 GPa without melting. Compared to the intial sample, the microstructure of both samples is crushed and compacted. The structure of the initial sample is comprised of two equilibrium phases of α-Al and Al3Gd. In the sample prepared without melting, a phase with composition Gd55Al45 is found in addition to the α-Al and Al3Gd phases; in the sample prepared with melting, a phase with composition Al92Gd8 is found. Features of the structure morphology and changes in the phase composition of the samples prepared under high pressure lead to changes in the physical and mechanical properties of the studied alloy.
PubDate: 2022-08-10

• Changes in the Ferromagnetic Resonance Spectra and Magnetic Anisotropy of
the [CoFeB/SiO2 Bi2Te3]47 Multilayer Heterostructures upon the Deposition
of Fe/Fe3O4 Nanoparticles on Their Surface

Abstract: An increase in the anisotropy constant of the [CoFeB/SiO2 Bi2Te3]47 heterostructure under the influence of magnetic Fe/Fe3O4 nanoparticles deposited on the surface of the heterostructure to 20 wt % is detected by ferromagnetic resonance. It is established that a layer of Fe/Fe3O4 nanoparticles with a thickness of about 27 nm on a diamagnetic GaAs substrate has its own magnetic anisotropy caused by the magnetic dipole interaction between the particles. A layer of nanoparticles bound by magnetic dipole interaction forms the equivalent magnetic film, the stray field of which changes the effective magnetic anisotropy of the [CoFeB/SiO2 Bi2Te3]47 heterostructure.
PubDate: 2022-08-10

• Generation of Optically Addressable Spin Centers in Hexagonal Boron

Abstract: The possibility of creating defects with spin-dependent fluorescence in a van der Waals material, namely, hexagonal boron nitride (hBN), by irradiating the latter with high-energy protons (EP = 15 MeV) is studied. The microphotoluminescence and electron paramagnetic resonance methods show that such irradiation leads to the emergence of boron vacancies in the negatively charged state ( $$V_{{\text{B}}}^{ - }$$ centers), the ground triplet spin state (S = 1) of which exhibits an optically induced population inversion.
PubDate: 2022-08-10

• Ab Initio Study of NaMFe(MoO4)3 (M = Mn, Fe, Co, Ni, Zn): Electron
Structure, Sodium Diffusion and Potentials

Abstract: The electronic structures of NaMFe(MoO4)3 (M = Mn, Fe, Co, Ni, Zn) molybdates isostructural to α-NaFe2(MoO4)3 or β-NaFe2(MoO4)3 is studied. Taking into account the electronic correlation in the Hubbard model, it is shown that these compounds are semiconductors with the band gap of 1.2–2.6 eV. The sodium diffusion pathways in the α-NaFe2(MoO4)3 and β-NaFe2(MoO4)3 structures are determined, and it is shown that the energy barrier in the compounds with the β-NaFe2(MoO4)3 structure is almost twice lower. The simulation of sodium extraction shows that these molybdates must have a high potential from 3 to 5 V and insignificant changes in the volume and the formation enthalpy depend on the sodium content. According to the obtained data, low-symmetry NaMFe(MoO4)3 (M = Mn, Fe, Co, Ni, Zn) molybdates exhibit diffusion properties and cathode voltage similar to those in the compounds of the NASICON structural type and also can be promising materials for sodium-ion batteries.
PubDate: 2022-08-10

• Magnetic and Magnetocaloric Properties of
Ho1 – xYx(Co0.84Fe0.16)2 Compounds

Abstract: Crystal structure, temperature and field dependences of magnetization, high-field susceptibility, and magnetocaloric effect (MCE) of Ho1 – xYx(Co0.84Fe0.16)2 polycrystalline compounds (x = 0–1) in magnetic fields up to 90 kOe in a temperature range of 5–400 K are investigated. An analysis of temperature dependences of magnetization (σ) showed that, depending on the yttrium content (x), up to three “critical” temperatures can be simultaneously present in the studied samples: spin-reorientation (Tsr), magnetic compensation point (Tcomp), and Curie temperature (TC). The temperature dependence of the high-field susceptibility (χhf) of all samples with x < 1 has an extremum in the vicinity of 100 K, where a significant MCE is observed, associated with a sharp change in the magnetization of the rare-earth sublattice. The temperature dependences of the magnetic entropy change (ΔSm) and the adiabatic temperature change (ΔTad) have a complex shape and reflect all the above-mentioned “critical” temperatures observed at different x.
PubDate: 2022-08-10

• Effect of High Pressures on the Formation of New Compounds in the
Al86Ni2Co6Gd6 Alloy

Abstract: Using the X-ray diffraction and electron microscopy methods, the structure and the elemental and phase compositions of hypereutectic alloy Al86Ni2Co6Gd6 (hereinafter, elemental composition in at %) are studied during melt solidification from 1500°C at a rate of 1000 degree/s under high pressures of 3 and 7 GPa. Melt solidification under high pressure leads to a change in the phase composition of the alloy and the formation of an abnormally supersaturated α-Al(Gd) solid solution. The following new phases were synthesized at a pressure of 7 GPa: the Al3Gd* phase (of the Al3U type) containing Co and Ni, which has primitive cubic structure cP4/2 with a lattice parameter of a = 4.285 ± 0.002 Å; the Al8Co4Gd* phase (of the Al8Cr4Gd type), which has tetragonal structure tI26/1 with parameters of a = 8.906 ± 0.003 Å and c = 5.150 ± 0.003 Å. The structure of all obtained samples is homogeneous, densely packed, and finely dispersed, without shrinkage cavities and pores. The average microhardness of the samples is high due to the formation of a solid solution and dispersion strengthening.
PubDate: 2022-08-10

• Radiation Stability of Nickel Doped Solar Cells

Abstract: The effect of doping with nickel on the radiation stability of silicon solar cells has been studied within a γ-radiation dose range of 105–108 rad. It has been shown that the diffusion doping of silicon with impurity nickel atoms increases the radiation stability of the parameters of silicon solar cells. It is implied that a reason of increase in the radiation stability of such solar cells is the existence of clusters, which are composed of impurity nickel atoms and serve as sinks for radiation defects.
PubDate: 2022-06-29
DOI: 10.1134/S1063783422040011

• Dielectric Properties of Composites Based on Oligomeric Diisocyanate and
Barium Titanate

Abstract: A number of composites based on oligomeric diisocyanate with different content of submicrometer particles of ferroelectric filler barium titanate (BaTiO3) are synthesized. Extremum behavior of the dependence of the dielectric characteristics of the obtained composites on the content of the filler with a sharp m-inimum of the dielectric permittivity and a maximum of the dielectric loss tangent at a BaTiO3 content of 30 vol % is established. A study of the morphology of composite layers by confocal microscopy showed that the observed dependences of their dielectric properties on composition are associated with changes in the structure of composites with percolation, and the formation of a single infinite cluster and structures of the matrix–island and chain types at certain critical concentrations.
PubDate: 2022-06-29
DOI: 10.1134/S1063783422040023

• Structure and Magnetic Properties of 09G2S Steel Obtained by the Selective
Laser Melting Method

Abstract: The structure, magnetic, and electrical properties of the 09G2S steel prepared by selective laser melting (3D steel) and casting are studied. It is found that the 3D 09G2S steel becomes similar in structure to the cast steel after normalization at 980°C for 30 min; in this case, the hardness decreases by 70% as compared to the annealed 3D steel. The surface stresses are maximal in the 3D steel after its preparation and 3-hour annealing. The normalization enables us to substantially decrease the residual stresses, which is confirmed by the X-ray diffraction and magnetometric measurements. The coercive force and the remanence of the normalized 09G2S steel are comparable with similar properties of the normalized cast 09G2S steel, which demonstrates the similarity of the structural and stress–strain states of the cast and 3D steels.
PubDate: 2022-06-08
DOI: 10.1134/S1063783422030076

• Structure and Magnetodielectric Properties of Composite Ceramics Based on

Abstract: In this research, the structural, electrodynamic, and magnetodielectric properties of composite ceramic materials based on lead ferroniobate Pb(Fe0.5Nb0.5)O3 have been studied. The experimentally obtained temperature and frequency dependences of the dielectric constant indicate the presence of a low-temperature polar state, large values of the dielectric constant in the microwave range, and high electrical conductivity of the materials studied.
PubDate: 2022-06-08
DOI: 10.1134/S1063783422030039

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