An improved method for studying equilibria between solids and gases at high temperature has been developed.Measurements have been made of the equilibrium constants for the reduction of zinc oxide and zinc silicate by hydrogen in the temperature range 750°-~ooo0 C. The results lead to values of the free energy, heat, and entropy of formation of ZnO and Zn2Si0,, which are in good agreement with values calculated from other thermochemical data.
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