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Diffusion couples are used to study the reaction between CaO powder and Fe 2 O 3 All heat treatments were performed in air. The growth and morphology of calcium ferrites is studied at different temperatures. It is shown that CaO·2Fe 2 O 3 , starts to form at about 1125°C, while the accepted phase diagram for equilibrium with air predicts a temperature of 1155°C.
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Bill Bergman (1986) studied this question.
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