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New data are presented on the phase equilibria of the binary systems CaO‐CuO and CaO‐Bi 2 O 3 . Corrected compositions are reported for Ca.Bi 6 O 13 and Ca 2 Bi 2 O 5 and a new metastable high‐temperature phase is reported for a composition near Ca 6 Bi 7 O 16.5 . The composition and decomposition temperatures for Ca 1–x .CuO 2 are given for both air and 1 atm of oxygen at 755 ± 5° and 835 ± 5°C, respectively.
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Roth et al. (1991) studied this question.
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