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The first measurements of phonon frequencies in a metal as a function of temperature, at constant values of the atomic volume, are reported. The [ζ00]T, ζ=0.2 mode exhibits considerable temperature dependence at constant volume, whereas modes in the [ζ00]L, [ζζ0]L, and [ζζ0]T1 branches show little such dependence. The mode Gr\"uneisen parameters are also determined.
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Copley et al. (1974) studied this question.
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