Citation: Tofield, B.C.; Newsam, J.M.; Cheetham, A.K. (1980). Structural studies of the high-temperature modifications of sodium and silver orthophosphates, II-Na3 P O4 and II-Ag3 P O4, and of the low-temperature form I-Ag3 P O4. Solid State Ionics, 1, pp. 377-393.