Abstract
Abstract Single crystals of Mg3Pt have been obtained from the elements by high pressure-high temperature reaction in a modified Belt-type apparatus. The compound crystallizes hexagonally, space group P63cm, with a=7.9103(8) A , c=8.3223(16) A , c/a=1.0521 and Z=6. The structure refinement (R=0.027, Rw=0.022 for 264 absorption-corrected reflections) shows unequivocally that Mg3Pt is isostructural with Cu3P and that the structure models proposed by Ferro and Rambaldi (Na3As type, space group P63/mmc) and Mansmann (anti-LaF3 type, space group P 3 c1 ) are wrong.
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