Thermochemical Properties of Lanthanoid-Iron-Perovskite at High Temperatures
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概要
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The standard Gibbs energy of formation of \barCFeO<SUB>3</SUB>(\barC=La, Nd, Sm, Eu, Gd, Tb, and Dy) from metallic iron, \barC<SUB>2</SUB>O<SUB>3</SUB>, and oxygen has been determined at temperatures from 1473 to 1673 K. Based on the free-energy data, the heat of reaction and the entropy change resulting from the reaction have been calculated. The values of the heat of reaction of LaFeO<SUB>3</SUB>, NdFeO<SUB>3</SUB>, SmFeO<SUB>3</SUB>, EuFeO<SUB>3</SUB>, and GdFeO<SUB>3</SUB> (the first group) were identical, −107 kcal/mol, at the present temperature interval. However, the values of the heat of reaction of TbFeO<SUB>3</SUB> and DyFeO<SUB>3</SUB> (the second group) decreased with an increase in the temperature. The entropy change of each reaction in the first group was constant, independent of the temperature, and each value decreased in the sequence from LaFeO<SUB>3</SUB> to GdFeO<SUB>3</SUB>. The entropy change of the second group decreased with an increase in the temperature. The change of the standard Gibbs energy was intimately related to the ionic radii of \barC-ions, and the relationship between the Gibbs energy and the tolerance factor has been clarified.
- 公益社団法人 日本化学会の論文
著者
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KIMIZUKA Noboru
National Institute for Research in Inorganic Materials
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Sugihara Tadashi
Department Of Chemistry
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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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Sugihara Tadashi
Department of Chemistry, Tokyo Institute of Technology
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