The mean-square atomic displacements (u~,) and (u~ z ) are calculated in the range 0-600K from thermodynamic and inelastic neutron-scattering data. Thermodynamic data alone give (2u~ + z u~), which is separated into its components 2(u~) and (u~) with the aid of the lattice-dynamical model of DeWames, Wolfram & Lehman and the neutron-diffraction data on which it is based. Earlier values derived from the Debye-Waller effect in X-ray scattering are discussed briefly.
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Barron et al. (1967) studied this question.