Abstract
The Debye-Waller parameters, the effective valuesBeff, the dynamic component,Bd, and the static component,Bs, of each constituent atom and also of the bulk were measured for some diatomic crystals with NaCl- and zinc blende-type structures. The dominant effect of heavy constituent atoms on the dynamic component of bulk crystals was found, and the mean square displacement in bulk crystals was approximated well by the atomic mass averaged mean square displacements of the constituent atoms. A remarkable effect of structural defects onBeff, particularly onBs, was observed in NiO samples with different degrees of non-stoichiometry. The different extents of the SiC-forming reaction between solid carbon and fused silicon resulted in quite differentBeff values; the larger theBeff value the smaller the extent of the reaction.
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