Prepd by warming a mixture of phosphorus and selenium in the correct proportions: Hahn, J. Prakt. Chem. [1] 93, 430 (1864); Muthmann, Clever, Z. Anorg. Chem. 13, 191 (1897); Meyer, ibid. 30, 258 (1902); 61B, 1807 (1928).
This monograph has been retired and is no longer subject to revision or update.