Phase equilibria in Sm2O3-V2O3-V2O5 system at 1200.DEG.C.
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概要
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The phase equilibria in the Sm<SUB>2</SUB>O<SUB>3</SUB>–V<SUB>2</SUB>O<SUB>3</SUB>–V<SUB>2</SUB>O<SUB>5</SUB> system was established at 1200 °C. In this system, Sm<SUB>2</SUB>O<SUB>3</SUB>, Sm<SUB>10</SUB>V<SUB>2</SUB>O<SUB>20</SUB>, SmVO<SUB>3</SUB>, SmVO<SUB>4</SUB>, V<SUB>2</SUB>O<SUB>3</SUB>, V<SUB>3</SUB>O<SUB>5</SUB>, V<SUB>4</SUB>O<SUB>7</SUB>, V<SUB>5</SUB>O<SUB>9</SUB>, V<SUB>6</SUB>O<SUB>11</SUB> and VO<SUB>2</SUB> were stable and Sm<SUB>10</SUB>V<SUB>2</SUB>O<SUB>20</SUB>, SmVO<SUB>4</SUB>, V<SUB>2</SUB>O<SUB>3</SUB>, and VO<SUB>2</SUB> had the non-stoichiometry. On the basis of the phase equilibria, the Gibbs free energy for the reactions, SmVO<SUB>3</SUB>+1⁄2O<SUB>2</SUB>=SmVO<SUB>4</SUB> and 4 Sm<SUB>2</SUB>O<SUB>3</SUB>+2 SmVO<SUB>3</SUB>+O<SUB>2</SUB>=Sm<SUB>10</SUB>V<SUB>2</SUB>O<SUB>20</SUB>, were determined to be −30.4±0.1 and −76.8±0.1 kcal, respectively. Also, standard Gibbs free energies of oxidation of various vanadium oxides were calculated.
- 公益社団法人 日本化学会の論文
著者
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KATSURA Takashi
Department of Chemistry
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Kitayama Kenzo
Department Of Applied Chemistry And Biotechnology
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