The Gibbs energies of formation of the inter‐oxide compounds in the Cu‐Sr‐O system have been obtained from solid‐state electrochemical measurements in the temperature range 900 to 1300 K. Cells employing yttria‐stabilized zirconia or single‐crystal calcium fluoride as electrolyte were used in studies of SrCu 2 O 2 , Sr 2 CuO 3 , SrCuO 2 , and “Sr 3 Cu 5 O 8+ z .” The oxygen potential vs stoichiometry dependence was studied, particularly for this last compound, by thermogravimetry at a few selected temperatures in the oxygen partial pressure interval 1 × 10 1 to 1 × 10 5 Pa. Based on the results of emf measurement, thermogravimetric study, and X‐ray powder diffraction, phase relations in this system were calculated.
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Alcock et al. (1990) studied this question.
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