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- W2012091770 abstract "Inelastic neutron-scattering spectra and neutron-diffraction patterns were measured on the alloy ${mathrm{Co}}_{3}mathrm{V}$ at temperatures from 1073--1513 K, where the $mathrm{hP}24$ (ordered hexagonal) and fcc structures are the equilibrium states of the alloy. Phonon density of states (DOS) curves were calculated from the inelastic-scattering spectra, allowing estimates of the vibrational entropy in the harmonic and quasiharmonic approximations. The vibrational entropy of the $mathrm{hP}24--mathrm{fcc}$ phase transition at 1323 K was found to be ${0.07k}_{B}/mathrm{atom}.$ The anharmonic contributions to the entropy over a temperature range of 100 K were comparable to the vibrational entropy of this phase transition. The anharmonic softening of the phonon DOS was only slightly larger for the $mathrm{hP}24$ than the fcc phase, however, so the anharmonic effects contribute only slightly to the difference in entropy of the two phases. The simple Gruneisen approximation was inadequate for predicting the thermal softening of the phonon DOS." @default.
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- W2012091770 date "1999-10-01" @default.
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- W2012091770 title "Phonon contributions to the entropies of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>hP</mml:mi><mml:mn>24</mml:mn><mml:mn /></mml:math>and fcc<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Co</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi mathvariant=normal>V</mml:mi></mml:math>" @default.
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- W2012091770 doi "https://doi.org/10.1103/physrevb.60.9329" @default.
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