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- W2036705900 endingPage "3321" @default.
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- W2036705900 abstract "We performed inelastic neutron-scattering measurements on powdered ${mathrm{Ni}}_{3}$Al. The alloy was prepared in two states of chemical order: (1) with equilibrium L${1}_{2}$ order, and (2) with disorder (the material was a fcc solid solution prepared by high-energy ball milling). Procedures to convert the energy loss spectra into approximate phonon density of states (DOS) curves for ${mathrm{Ni}}_{3}$Al in the two states of chemical order were guided by Born--von K'arm'an analyses with force constants obtained from previous single-crystal experiments on L${1}_{2}$-ordered ${mathrm{Ni}}_{3}$Al and fcc Ni metal. The main difference in the phonon DOS of the ordered and disordered alloys occurs near 39 meV, the energy of a peak arising from optical modes in the ordered alloy. These high-frequency optical modes involve primarily the vibrations of the aluminum-rich sublattice. The disordered alloy, which does not have such a sublattice, shows much less intensity at this energy. This difference in the phonon DOS around 39 meV is the main contributor to the difference in vibrational entropy of disordered and ordered ${mathrm{Ni}}_{3}$Al, which we estimate to be ${mathit{S}}_{mathrm{vib}}^{mathrm{dis}}$-${mathit{S}}_{mathrm{vib}}^{mathrm{ord}}$=(+0.2ifmmodepmelsetextpmfi{}0.1)${mathit{k}}_{mathit{B}}$/atom at high temperatures." @default.
- W2036705900 created "2016-06-24" @default.
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- W2036705900 date "1995-08-01" @default.
- W2036705900 modified "2023-10-09" @default.
- W2036705900 title "Phonon densities of states and vibrational entropies of ordered and disordered<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Ni</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Al" @default.
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- W2036705900 doi "https://doi.org/10.1103/physrevb.52.3315" @default.
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