Phase equilibria in the La2O3-V2O3-V2O5 system at 1200.DEG.C.
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概要
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The phase equilibria in the La<SUB>2</SUB>O<SUB>3</SUB>–V<SUB>2</SUB>O<SUB>3</SUB>–V<SUB>2</SUB>O<SUB>5</SUB> system were established at 1200 °C by changing oxygen partial pressures from －0.68 (air) to －13.00 in terms of log<I>P</I><SUB>O<SUB>2</SUB></SUB>. In this system, 0.81La<SUB>2</SUB>O<SUB>3</SUB>·0.19V<SUB>2</SUB>O<SUB>5</SUB>(La<SUB>1.62</SUB>V<SUB>0.38</SUB>O<SUB>3.38</SUB>), 3La<SUB>2</SUB>O<SUB>3</SUB>·V<SUB>2</SUB>O<SUB>5</SUB>(La<SUB>3</SUB>VO<SUB>7</SUB>), 0.71La<SUB>2</SUB>O<SUB>3</SUB>·0.29V<SUB>2</SUB>O<SUB>5</SUB>(La<SUB>1.42</SUB>V<SUB>0.58</SUB>O<SUB>3.58</SUB>), LaVO<SUB>4</SUB>, LaVO<SUB>3</SUB>, V<I><SUB>n</SUB></I>O<SUB>2<I>n</I>－1</SUB> (<I>n</I>=2–7), and VO<SUB>2</SUB> were stable. LaVO<SUB>3</SUB>, LaVO<SUB>4</SUB>, La<SUB>1.62</SUB>V<SUB>0.38</SUB>O<SUB>3.38</SUB>, La<SUB>3</SUB>VO<SUB>7</SUB>, and La<SUB>1.42</SUB>V<SUB>0.58</SUB>O<SUB>3.58</SUB> have nonstoichiometric compositions. On the basis of the phase equilibria, the Gibbs energies of the reactions:<BR>31⁄50La<SUB>2</SUB>O<SUB>3</SUB>+19⁄50LaVO<SUB>3</SUB>+19⁄100O<SUB>2</SUB>=La<SUB>1.62</SUB>V<SUB>0.38</SUB>O<SUB>3.38</SUB><BR>50⁄31La<SUB>1.62</SUB>V<SUB>0.38</SUB>O<SUB>3.38</SUB>+12⁄31LaVO<SUB>3</SUB>+6⁄31O<SUB>2</SUB>=La<SUB>3</SUB>VO<SUB>7</SUB><BR>21⁄50La<SUB>3</SUB>VO<SUB>7</SUB>+4⁄25 LaVO<SUB>3</SUB>+2⁄25O<SUB>2</SUB>=La<SUB>1.42</SUB>V<SUB>0.58</SUB>O<SUB>3.58</SUB><BR>LaVO<SUB>3</SUB>+1⁄2O<SUB>2</SUB>=LaVO<SUB>4</SUB><BR> were determined to be －64.0, －55.8, －21.6, and －131.5 kJ respectively.
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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Zoshima Daizo
Department of Chemistry, Faculty of Science, Tokyo Institute of Technology
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