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Compositions in the system Fe 2 O3‐FeO‐BaO in the vicinity of the compound BaFe 12 O 19 were studied at temperatures from 1300° to 1550°C and oxygen pressures from 10 −2 to 10 2 atm. Equilibrium relations involving several barium ferrous ferrites are described. Barium ferrite can be crystallized congruently from the melt at 40 atm oxygen pressure and 15400°C.
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H. Jerrold Van Hook (1964) studied this question.
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