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Cadmium Arsenide

The freezing-point, density, and atomic volume curves, supplemented by an examination of the microstructure, confirm the existence of Cd3As2 and CdAs2. Cd3As2 is reddish grey, of density 6.25, and it melts at 721° C. Its hardness is less than 3.5. CdAs2 is bluish grey, of density 5.86, and it melts at 621° C. Its hardness is 3.5–4.0.

Cd3As2 has been prepared by subjecting cadmium and arsenic, in appropriate proportions, to a pressure of 6500 atmospheres. Some Cd6As was formed when cadmium and arsenic were melted together, but Cd3As2 is readily formed by heating cadmium in arsenic vapour mixed with hydrogen or an inert gas. It was thus obtained in reddish octahedra of density 6.211 at 15° C. It reacts with acids and the halogens like the arsenides in general.

Descamps obtained Cd3As by reducing cadmium arsenate with potassium cyanide. It was white, with a slight reddish colour and a metallic lustre.

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