The phase diagram of the system Na2SO4 - CaSO4

Abstract

Quenching of Na₂SO₄ - CaSO₄ melts down to room temperature results in different forms of metastable solid solutions dependent on the CaSO₄ content. The transformation of these solid solutions into stable phases were investigated after various times and temperatures by X-ray powder diffraction and thermal analyses. An equilibrium phase diagram is derived, which is in accordance with all experimental facts.