Phase Diagrams of the Me2O-P2O5(As2O5)-(H,D)2O Systems in the Crystallization Region of Mono-substituted Salts

The study of phase diagrams of physico-chemical systems in which crystallization is taking place and the investigaton of phases coexisting in such systems provide the basis for improving the growth techniques and perfecting the optical properties of crystals. As far as the Me₂O-P₂O₅(As₂O₅)-(H,D)₂O systems are concerned little research appears to have been done until now and there are still a considerable number of questions to be answered, particularly concerning heavy water systems.