Sr.oP"0 2,(OH),, (Hex. a = 9.765 A, c = 7.280 A), and Ba.oP602,(O H}" (Hex. a = 10.177 A, c = 7.73 1 A), undergo cell parameter co ntracti ons a t e le vated temperatures in air. These ca n be co rre lated with progressive dehydroxylation, althou gh ne ith er can be co mpl ete ly dehydrated. Pb.oP6 0 24 (O H}" (Hex. a = 9.878 ..t, c = 7.432 A), a lso does not co mpl e tely dehydrate in air.
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Negas et al. (1968) studied this question.