Überblick über die Phosphide des Strontiums

The method of the reaction in a stainless steel cube which was used for the first time in the preparation of barium phosphides is also applicable to phosphide-producing mixtures of strontium and phosphorus. In connection with high temperature experiments it served to obtain a survey of the binary system strontium—phosphorus. This binary system is largely analogous to the binary system barium—phosphorus. The compounds found were: “Sr₂P”, Sr₃P₂, Sr₄P₃? Sr_1,1P, SrP, Sr₄P₅ and SrP². The strontium-rich phosphides have melting or decomposing temperatures which are higher than those of the analogous barium phosphides. The powders of Sr₃P₂, Sr₄P₃ and SrP are brown to blackviolet. Sr₃P₂ cristallizes isostructurally with Ba₃P₂. Some properties indicate that the bonding is more ionic than in Ba₃P₂. The structural relationship of the alkaline earth pnietides with the lanthanide chalogenides is discussed. Sr₃P₂ and Ba₃P₂ complete the inverse isostructures of these compounds.