High Temperature Dehydroxylation of Apatitic Phosphates.

Abstract

Sr10P6O24(OH)2, (Hex. a = 9.765 Å, c = 7.280 Å), and Ba10P6O24(OH)2, (Hex. a = 10.177 Å, c = 7.731 Å), undergo cell parameter contractions at elevated temperatures in air. These can be correlated with progressive dehydroxylation, although neither can be completely dehydrated. Pb10P6O24(OH)2, (Hex. a = 9.878 Å, c = 7.432 Å), also does not completely dehydrate in air. A new apatite-like strontium phosphate, (Hex. a = 9.872 Å, c = 7.199 Å), was prepared at elevated temperatures in vacuum.