Ceramics-Silikáty 25, (2) 169 - 171 (1981) |
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PRASE EQUILIBRIA IN THE SYSTEM Ca-Cr-O
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Pánek Zdeněk
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Institute of Inorganic Chemistry, Slovak Academy of Sciences, 809 34 Bratislava, Dúbravská cesta 5
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The disagreement between the rates of shrinkage of powdered pressed specimens of the given system during their sintering, and the reactions specified in the equilibrium phase diagram necessitated its revision in the concentration region of 0-50 wt. % Cr₂O₃ . Ca₃(CrO₄)₂ was found to melt incongruently at 1255 ± 5 °C producing Ca₅(CrO₄)₃ and a melt. Ca₅(CrO₄)₃ likewise melts incongruently producing CaO and melts at 1275 ± 5 °C. An equilibrial phase diagram taking into account these new findings has been constructed. |
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