THERMODYNAMIC STUDIES OF HIGH-TEMPERATURE EQUILIBRIA .22. DETERMINATION OF THE STABILITY OF BASIC ZINC-SULFATE (ZNO.2ZNSO4) BY SOLID-STATE EMF-MEASUREMENTS

The equilibrium 3ZnO(s) plus 2SO//2(g) plus 0//2(g) reversible reaction ZnO multiplied by (times) 2ZnSO//4(s) was studied by equilibrating the solid phases ZnO and ZnO multiplied by (times) 2ZnSO//4 with a continuously flowing SO//2-Ar gas mixture of known composition. A log K relationship, valid in the temperature range 900-1070 K, was obtained. By interpretation of X-ray powder diffraction data for the basic zinc sulfate ZnO multiplied by (times) 2ZnSO//4, the values of the cell parameters (monoclinic cell) were found.