Preparation and physical properties of EuC2 and its solid solutions, RxEu1-xC2 (R=La and Gd)
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概要
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A cubic-tetragonal phase transformation of EuC<SUB>2</SUB> was observed at 623 K. The phase transition temperatures of metal dicarbides (MC<SUB>2</SUB>) were discussed in terms of the band structure proposed by previous authors. The compound EuC<SUB>2</SUB> was a ferromagnet with a zero field curie temperature of 20 K, which was close to the value expected from the Curie temperature <I>vs.</I> nearest neighbor Eu–Eu distance relation for the Eu chalcogenides. The solid solutions, La<I><SUB>x</SUB></I>Eu<SUB>1−<I>x</I></SUB>C<SUB>2</SUB>, became ferromagnetic at low temperatures over the whole composition range, while the solid solutions, Gd<I><SUB>x</SUB></I>Eu<SUB>1−<I>x</I></SUB>C<SUB>2</SUB>, have continuously changed the kind of magnetic order from ferromagnetic to antiferromagnetic. All the effective moments obtained for R<I><SUB>x</SUB></I>Eu<SUB>1−<I>x</I></SUB>C<SUB>2</SUB> were in good agreement with the theoretical values of Eu<SUP>2+</SUP> and R<SUP>3+</SUP> contained. The electrical resistivities of EuC<SUB>2</SUB> and its solid solutions had a sharp peak near the Curie temperature. When magnetic field was applied, the peak became broader and shifted to higher temperature.
- 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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Sakai Tetsuo
Department Of Biochemistry And Molecular Biology Kyorin University School Of Medicine
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Shiokawa Jiro
Department of Applied Chemistry, Faculty of Engineering, Osaka University
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Yoshida Takeshi
Department of Applied Chemistry, Faculty of Engineering, Kanagawa University
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Ueno Shin-ya
Department of Applied Chemistry, Faculty of Engineering, Osaka University
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