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- W2054210918 abstract "Phonons in sodium fluoride have been studied at room temperature using inelastic neutron scattering techniques. Consistent results were obtained using a cold neutron time-of-flight apparatus and a triple-axis spectrometer. The time-of-flight results were interpolated on to symmetry directions from the observed scattering surfaces. The frequencies in units of ${10}^{12}$ ${mathrm{sec}}^{ensuremath{-}1}$ of some typical phonons are: TA(0,0,1), $ensuremath{nu}=4.39ifmmodepmelsetextpmfi{}0.04$; LO(0,0,0.984), $ensuremath{nu}=8.52ifmmodepmelsetextpmfi{}0.15$; LA(0,0,0.972), $ensuremath{nu}=7.94ifmmodepmelsetextpmfi{}0.18$; TO(0.488, 0.488, 0.488), $ensuremath{nu}=6.19ifmmodepmelsetextpmfi{}0.07$. The optical branches extrapolated to small wave vector are in agreement with the infrared absorption frequency and the Lyddane-Sachs-Teller relation. Hardy and Karo's deformation-dipole model is in agreement with the results to within 6%, but the rigid-ion model differs by as much as 19%. The results are well fitted by a shell model containing nine parameters in which the ionic charge is 0.91." @default.
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- W2054210918 date "1967-01-15" @default.
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- W2054210918 title "Lattice Dynamics of Sodium Fluoride" @default.
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- W2054210918 doi "https://doi.org/10.1103/physrev.153.923" @default.
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