BaO-Fe2O3凝相系平衡状態図について
スポンサーリンク
概要
- 論文の詳細を見る
The equilibrium of the system BaO-Fe<SUB>2</SUB>O<SUB>3</SUB> has been studied by ordinary mineralographic methods. In some of the specimens of this system, the dissociation of Fe<SUB>2</SUB>O<SUB>3</SUB> has been observed, and hence in such cases, the experiments were conducted under 1 atm. pressure of oxygen.<BR>The results obtained in the present studies are summarized in Fig. 1. The existence of three compounds BaO⋅6Fe<SUB>2</SUB>O<SUB>3</SUB>, BaO⋅Fe<SUB>2</SUB>O<SUB>3</SUB> and 2BaO-Fe<SUB>2</SUB>O<SUB>3</SUB> was confirmed. The two binary eutectic reactions, Liquid ?? BaO.6Fe<SUB>2</SUB>O<SUB>3</SUB>+BaO⋅Fe<SUB>2</SUB>O<SUB>3</SUB> at 1370°C and Liquid ?? BaO⋅Fe<SUB>2</SUB>O<SUB>3</SUB>+2BaO⋅Fe<SUB>2</SUB>O<SUB>3</SUB> at 1330°C ware observed at the composition of 60.0 mole% and 41.2 mole% Fe<SUB>2</SUB>O<SUB>3</SUB> respectively.<BR>BaO.6Fe<SUB>2</SUB>O<SUB>3</SUB> (85.7mole% Fe<SUB>2</SUB>O<SUB>3</SUB>) forms a solid solution by the dissolution of BaO⋅Fe<SUB>2</SUB>O<SUB>3</SUB>. The BaO: Fe<SUB>2</SUB>O<SUB>3</SUB> ratio of the solid solution was 18.2: 81.8 mole at 1350°C and 16.7: 83.3 mole at 800°C, but the solubility of Fe<SUB>2</SUB>O<SUB>3</SUB> in this phase was not observed. The solubility range of BaO.Fe<SUB>2</SUB>O<SUB>3</SUB> phase is very narrow and the solubility of BaO⋅Fe<SUB>2</SUB>O<SUB>3</SUB> in 2BaO⋅Fe<SUB>2</SUB>O<SUB>3</SUB> was not observed. The compound BaO⋅6Fe<SUB>2</SUB>O<SUB>3</SUB> is a hexagonal lattice, a =5.877, c=23.02Å, BaO⋅Fe<SUB>2</SUB>O<SUB>3</SUB> a tetragonal lattice, a=6.02, c=9.45Å, and 2BaO⋅Fe<SUB>2</SUB>O<SUB>3</SUB> a cubic lattice, a=8.07Å.
- 社団法人 粉体粉末冶金協会の論文
著者
関連論文
- チタン酸バリウムの相転移におよぼす一軸加圧効果
- チタン酸バリウム微粒子の構造と誘電性
- 1 粉末の粒子形態と焼結性,その他の物性
- 還元鉄粉の粒子形態の研究
- BaTiO_3-BaB_2O_4系状態図とその熔融物からのBaTiO_3結晶の育成
- BaO-Fe2O3凝相系平衡状態図について