The phase diagram of the system indicates the presence of the solid‐state . Density vs. composition isotherms in the range 475°–650°C are approximately linear. Isotherms of equivalent conductivity deviate negatively from additivity when plotted against composition, the maximum negative deviation being found near . The heat of activation for ionic migration falls rapidly from that of until has reached 0.30, then slowly falls to the limiting value for pure .
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Duke et al. (1957) studied this question.