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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 paper, a new fct phase of disordered Fe-Pd Invar alloys was found at low temperatures, and the low temperature phase diagram was obtained from X-ray diffraction experiments (4.2 K to 300 K).
Abstract: A new fct phase of disordered Fe–Pd Invar alloys was found at low temperatures. The low temperature phase diagram was obtained from X-ray diffraction experiments (4.2 K to 300 K). The fct phase ranges from 28% to 33.5% Pd at 0 K and the temperature dependence of lattice constants was determined. A decrease of the X-ray Debye temperature associated with a lattice softening was observed for 34% Pd in the low temperature region.
54 citations
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54 citations
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SIDI1
TL;DR: In this article, structural, elastic, thermodynamic, electronic, and magnetic properties of the full-Heusler compound Ag2CeAl were determined using generalized gradient approximation with exchange-correlation functional GGA (PBEsol) with spin-orbit coupling (SOC) correction.
Abstract: Structural, elastic, thermodynamic, electronic, and magnetic properties of the full-Heusler compound Ag2CeAl were determined using generalized gradient approximation with exchange-correlation functional GGA (PBEsol) with spin-orbit coupling (SOC) correction. The elastic modulus and their pressure dependence are calculated. From the elastic parameter behavior, it is inferred that this compound is elastically stable and ductile in nature. Through the quasi-harmonic Debye model, in which the phononic effect is considered the effect of pressure P (0 to 50) and temperature T (0 to 1000) on the lattice constant, the elastic parameters, bulk modulus B, heat capacity and thermal expansion α, internal energy U, entropy S, Debye temperature 𝜃D, Helmholtz free energy A, and Gibbs free energy G are investigated. The thermodynamic properties show that the compound Ag2CeAl is a heavy fermion material. The density of state (DOS), magnetic momentum, and band structure are computed, to investigate the magnetic and metallic characteristics. The calculated polarization of the compound is 77.34%. The obtained results are the first predictions of the physical properties for the rare-earth-based (Ce) full-Heusler Ag2CeAl.
54 citations
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TL;DR: In this paper, single phase Bi2FeMnO6 was synthesized on Si substrates by an electrospray method and three peaks were observed in the temperature dependence of magnetization curve, which were attributed to the inhomogeneous distribution of Fe3+ and Mn3+ The observed magnetic peaks at 150 K, 260 K, and 440 K correspond to orderings of the ferrimagnetic Fe-O-Mn, and antiferromagnetic Mn-Omn, respectively Heat capacity measurements were carried out to confirm these magnetic transitions.
Abstract: Single phase Bi2FeMnO6 was synthesized on Si substrates by an electrospray method Three peaks were observed in the temperature dependence of magnetization curve, which is attributed to the inhomogeneous distribution of Fe3+ and Mn3+ The observed magnetic peaks at 150 K, 260 K, and 440 K correspond to orderings of the ferrimagnetic Fe–O–Mn, and antiferromagnetic Mn–O–Mn and Fe–O–Fe, respectively Heat capacity measurements were carried out to confirm these magnetic transitions The Debye temperature of Bi2FeMnO6 is 339 K, calculated from Debye–Einstein fitting
53 citations
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TL;DR: In this article, the compositional dependence of the crystal structure and lattice thermal conductivity in the Cu3SbSe4-SbS4 system has been studied.
Abstract: The compositional dependence of the crystal structure and lattice thermal conductivity in the Cu3SbSe4-Cu3SbS4 system has been studied. The lattice parameters of the Cu3SbSe4-xSx compounds decrease linearly with x, and the tetragonal structure (space group 14−2m no. 121) of the end compounds is maintained at all compositions. The lattice thermal conductivity is much lower than that predicted by a simple rule of mixtures, which is typical for a solid solution. The Debye model produces a very reasonable fit to the experimental lattice thermal conductivity data when phonon scattering due to atomic mass and size differences between Se and S is taken into account. Compounds in this series are likely to improve upon the thermoelectric performance of Cu3SbSe4, which has shown ZT = 0.72 when optimized.
53 citations