Preparation and oxidation of europium(II) niobium bronze EuxNbO3-y.
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概要
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Mixed oxides containing bivalent europium, Eu<I><SUB>x</SUB></I>NbO<SUB>3−<I>y</I></SUB> (0.5<<I>x</I><1.0), were synthesized by the solid state reaction of Eu<SUB>2</SUB>O<SUB>3</SUB>, Nb<SUB>2</SUB>O<SUB>5</SUB>, and Nb powder. The structural change of Eu<I><SUB>x</SUB></I>NbO<SUB>3−<I>y</I></SUB> from a tetragonal to cubic form takes place at <I>x</I>=0.65. The mechanism of oxidation for the bronzes was studied. Each bronze shows different behavior in oxidation, the cubic bronze giving an amorphous phase and the tetragonal bronze complex crystalline products. EuNbO<SUB>4</SUB> was crystallized from both the amorphous and crystalline phases at 950 K and 1070 K, respectively. TG-DTA and magnetic studies indicated that the oxidized phases play an important role in the rate-determining step of oxidation for the bronzes.
- 公益社団法人 日本化学会の論文
著者
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Adachi Gin-ya
Department Of Applied Chemistry Faculty Of Engineering Osaka University
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Ishikawa Kenji
Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
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Shiokawa Jiro
Department of Applied Chemistry, Faculty of Engineering, Osaka University
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Tanida Midori
Department of Applied Chemistry, Faculty of Engineering, Osaka University
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