Abstract
The Debye-Waller exponent B and the Debye temperature ΘD for a powdered sample of MgO has been determined at room temperature by elastic neutron scattering using a triple-axis spectrometer. Detailed calculations were performed to estimate the thermal diffuse scattering (TDS) under the Bragg peaks. The TDS contribution proved to be negligible. The value obtained for B is 0.354 ± 0.008 A2 which corresponds to a ΘD of 743 ± 8 K. The ΘD value obtained here for a powdered sample is about two percent lower than the corresponding value obtained from the inelastic neutron scattering for a single-crystal sample.
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