Topochemical Transformations of (NH4)9H(P3O10)2 multiplied by (times) 2H2O under Nonisothermal Conditions.

During nonisothermal vacuum treatment in the 60-95 degree C range the crystallohydrate (NH//4)//9H(P//3O//1//0)//2 multiplied by (times) 2H//2O is topochemically converted into the anhydrous salt (NH//4)//9H(P//3O//1//0)//2, which crystallizes together with other phosphate phases. In the presence of water vapor the process proceeds with the destruction of the cation and anion and is characterized by comparable rates of removal of water of crystallization and ammonia.