Phase equilibria among acid calcium phosphates

摘要

The stable ternary system H_3PO_4-Ca(OH)_2-H_2O has been established further by determining the equilibria among the acidic calcium phosphates. In particular, equilibria involving CaHPO_42H_2O, CaHPO_4, Ca(H_2PO_4)_2H_2O, and Ca(H_2PO_4)_2.H_2O have been established. In contrast to Earlier opinions, Ca(H_2PO_4)_2 is not a stable phase in this System at any temperature below 100 deg C.