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Debye model
About: Debye model is a research topic. Over the lifetime, 7462 publications have been published within this topic receiving 133987 citations.
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TL;DR: In this article, the specific heat of the superconductors La1.85Sr0.15CuO4 and YBa2Cu3O7 was measured from 1 to 350 K.
Abstract: The specific heat of the superconductors La1.85Sr0.15CuO4 and YBa2Cu3O7 was measured from 1 to 350 K. A maximum in C/T3 near 22 K indicates enhanced phonon density of states at energies ω~11 meV. A lattice specific heat still below 3R at room temperature implies the existence of high energy phonon states at ~50 meV or beyond. The initial Debye temperature lies in the 380–400 K range. At low temperatures, abnormal electronic contributions are seen, mainly in YBa2Cu3O7. The specific heat jumps are resolved in six samples: ΔC/Tc14 mJK-2mole–Cu-1 in La1.85Sr0.15CuO4 and ΔC/Tc13 mJK-2mole–Cu-1 in YBa2Cu3O7.
47 citations
TL;DR: In this article, the Debye model and the Stokes-Einstein-Debye relation in conjunction with the Maxwell-Garnett equation were used for free-solution identification through molecular finger-printing.
Abstract: Aqueous solutions of a variety of proteins at different concentrations are examined through microwave spectroscopy and compared to sodium chloride and polystyrene nanospheres. The complex permittivity is analysed in terms of the Debye model and the Stokes-Einstein-Debye relation in conjunction with the Maxwell-Garnett equation. According to Einstein’s classical theory of viscosity with Brenner’s adaptation [H. Brenner, Chem. Eng. Sci. 27, 1069 (1972)] for arbitrary solute shapes, the ratio of the alterations of static permittivity and relaxation time of low concentration solutions is found to be independent of concentration and determined by the molecular shape. Our results represent a route towards free-solution identification through molecular finger-printing.
47 citations
TL;DR: In this paper, the structural, electronic, mechanical and thermodynamic properties of (Ti1−xMox)2AlC (0 ≤ x ≤ 0.20) were explored using density functional theory.
Abstract: The structural, electronic, mechanical and thermodynamic properties of (Ti1−xMox)2AlC (0 ≤ x ≤ 0.20) were explored using density functional theory. The obtained lattice constants agree well with the experimental values. The electronic band structure confirms the metallic nature. Strengthening of covalent bonds due to Mo substitution is confirmed from the study of band structure, electronic density of states and charge density mapping. The elastic constants satisfy the mechanical stability criteria. Strengthening of covalent bonds leads to enhanced mechanical properties. (Ti1−xMox)2AlC compounds are found to exhibit brittle behavior. The anisotropic nature of (Ti1−xMox)2AlC is revealed from the direction dependent Young's modulus, compressibility, shear modulus and Poisson's ratio as well as the shear anisotropic constants and the universal anisotropic factor. The Debye temperature, minimum thermal conductivity, Gruneisen parameter and melting temperature of (Ti1−xMox)2AlC have been calculated for different Mo contents. Our calculated values are compared with reported values, where available.
47 citations
TL;DR: In this paper, transmission and reflection measurements on various polymer films were performed in the THz frequency region, and the dielectric function was calculated by the Debye model to interpret the data.
47 citations
TL;DR: In this article, the physical properties of the sigma-phase in Fe-Cr and Fe-V alloy systems are discussed both with experimental and theoretical methods, and the following questions relevant to the issue have been addressed: identification of sigma and determination of its structural properties.
Abstract: A review is presented on physical properties of the sigma-phase in Fe-Cr and Fe-V alloy systems as revealed both with experimental -- mostly with the Mossbauer spectroscopy -- and theoretical methods. In particular, the following questions relevant to the issue have been addressed: identification of sigma and determination of its structural properties, kinetics of alpha-to-sigma and sigma-to-alpha phase transformations, Debye temperature and Fe-partial phonon density of states, Curie temperature and magnetization, hyperfine fields, isomer shifts and electric field gradients.
47 citations