Abstract
Results of a diffuse neutron scattering experiment on powder under pressure are presented. A sapphire anvil pressure cell was used and pressures up to 1.6 GPa were applied. The results confirm that an orientational order - disorder transition occurs at room temperature under high pressure. The data indicate a 70% occupancy of the orientational variant in under high pressure. The presence of elastic diffuse scattering shows that static orientational disorder persists at least up to 1.3 GPa which is the highest pressure up to which the diffuse scattering was investigated. The compressibility at room temperature was determined to be in agreement with results of Duclos et al.
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