BaO・2FeO・8Fe<SUB>2</SUB>O<SUB>3</SUB> (W), BaO・FeO・7Fe<SUB>2</SUB>O<SUB>3</SUB> (X)六方晶フェライトの安定存在領域
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Equilibrium experiments were performed to determine thermally stable ranges of BaO⋅2FeO⋅8Fe<SUB>2</SUB>O<SUB>3</SUB> (W) and BaO⋅FeO⋅7Fe<SUB>2</SUB>O<SUB>3</SUB> (X) under various oxygen pressures. Ferrous contents of W and X compounds increas-ed with increasing temperature and with decreasing oxygen pressure. No significant changes in saturation magnetization were observed with variation of ferrous contents of W and X compounds. Upper and lower limits of the stablility ranges for W and X compounds were found to be expressed as follows:<BR>(1) W compound; W=Magnetite+Liq. RTlnPo<SUB>2</SUB>=-1030×10<SUP>3</SUP>+578T(1622-1728 K), 2W+O<SUB>2</SUB>=2M (BaO⋅Fe<SUB>2</SUB>O<SUB>3</SUB>)+6Fe<SUB>2</SUB>O<SUB>3</SUB> RTlnPo<SUB>2</SUB>=-444×10<SUP>3</SUP>+255T (1448-1622K)<BR>(2) X compound; X=W+Liq. RTlnPo<SUB>2</SUB>=-967×10<SUP>3</SUP>+553T (1587-1697K), 2X=W+M (BaO⋅6Fe<SUB>2</SUB>O<SUB>3</SUB>) RTlnPo<SUB>2</SUB>=-682×10<SUP>;3</SUP>+402T (1510-1633K)<BR>Here, Po<SUB>2</SUB>: the oxygen pressure in atm unit, T: temperature in K unit, and R: 8.3145J/mol⋅K.
- 社団法人 粉体粉末冶金協会の論文
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