The crystal structure of ThPt and some related compounds

The crystal structures of several thorium alloys, including ThPt and ThRh, are reported. The alloys were prepared by arc-melting the component metals in a Zrgettered atmosphere. Powders were prepared by crushing in air. Powder patterns were obtained with a Guinier-type focusing camera using monochromatized Cu radiation, and the line intensities were estimated visually. (R.J.S.)