Abstract
Several single crystals near the composition MgCd3 were prepared in vacuum by the Tammann-Bridgman method. Using these single crystals, we measured the thermal expansion through the order-disorder transformation in the two crystallographic directions, namely, in the directions parallel and perpendicular to the principal hexagonal axis. It was found for MgCd3, containing 74,5 atomic%Cd, that the transformation from an ordered state to a random state was accompanied by a remarkable anisotropy in the thermal expansion, viz, an expansion of about 4.3% was found in the direction parallel to c-axis, while a contraction of about 1.5% was found in the direction perpendicular to c-axis. The net change of volume associated with the disordering process was thus found to be an expansion of approximately 1.3%. These data were compared with our previous results obtained by the dilatometric study of the polycrystalline specimens.
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