The thermodynamics of nonstoichiometric Pr1-yGdyO1.5+.DELTA..
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概要
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In order to contribute to the study of the thermodynamics of point defects in ionic crystals, the nonstoichiometry, δ, of Pr<SUB>1−<I>y</I></SUB>Gd<I><SUB>y</SUB></I>O<SUB>1.5+δ</SUB> (<I>y</I>=0, 0.1, 0.2, and 0.4) with a wide nonstoichiometric composition range was measured as a function of the oxygen partial pressure. Assuming that excess oxygen ions preferentially occupy Z-sites of the bixbyite structure and that the Pr<SUP>3+</SUP> and Pr<SUP>4+</SUP> ions are distributed on cationic sites at random, the equilibrium constant, <I>K</I>, was calculated for<BR>2Pr^4++O_z^2-=2Pr^3++V_z+\frac12O_2<BR>It was found that ln<I>K</I> changes with δ in the relation;<BR>lnK=A+Bδ+Cδ^2<BR>The parabolic dependence of ln<I>K</I> on δ is interpreted in terms of the changes in the energy of the defect formation and in the interaction energy between defects with the volume.
- 公益社団法人 日本化学会の論文
著者
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Yamauchi Shigeru
Department Of Industrial Chemistry Faculty Of Engineering The University Of Tokyo
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Fueki Kazuo
Department Of Industrial Chemisrty Faculty Of Science And Technology Science University Of Tokyo
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Endo Kazuhiro
Department Of General Surgery Jichi Medical University
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Mukaibo Takashi
Department of Applied Chemistry Faculty of Engineering The University of Tokyo
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Yamauchi Shigeru
Department of Chemistry, Faculty of Science, The University of Tokyo
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Yamauchi Shigeru
Department of Industrial Chemistry, Faculty of Engineering, The University of Tokyo
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