Phase Relations in Cu-RO_(1.5)-O (R = Ho,Er,Yb) and Gibbs Energy of Formation of Cu_2R_2O_5 (R = Ho,Er,Yb) Between 1000 and 1325K

摘要

Phase relations in Cu-RO_(1.5)-O(R = Ho,Er,Yb) ternary systems at 1273K have been established by isothermal equilibration of samples containing different ratios of Cu:R(R = Ho,Er,Yb) in flowing air or high purity argon atmosphere for four days. The samples were then rapidly cooled to ambient temperature and the coexisting phases were identified by powder x-ray diffraction analysis. Only one ternary oxide, Cu_2R_2O_5(R = Ho,Er,Yb) was found to be stable.