Eu^<2+>を高濃度に含むEuO-Al_2O_3-B_2O_3-SiO_2ガラスの磁気特性(<特集>希土類系物質の精密合成,形態制御および機能物性)

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概要

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• Fabrication of EuO-Al_2O_3-B_2O_3-SiO_2 glasses with high-concentration of Eu^<2+> ions was attempted in N_2 gas with an IR-image furnace and rapid quenching in twin rollers. Their magnetic susceptibilities of these glasses obeyed the Curie-Weiss law with the negative Curie temperature at temperatures higher than 50 K, while Eu^<2+> ions coupling by a superexchange-type mechanism involving oxygen ions at temperatures lower than 50 K showed a ferromagnetism. From their magnetization data at lower temperatures, we estimated an amount of Eu^<2+> ions in the glasses, in whose fabrication process a part of Eu^<2+> ions were oxidized to Eu^<3+>. We also measured FT-IR and Raman spectra and discussed the stable valence state of europium ions in the studied class-matrixes.

• 2007-10-01

著者

• 杉原 洋亮

  Department of Materials Science and Engineering, Nagoya institute of Technology

• 早川 知克

  Department of Materials Science and Engineering, Nagoya institute of Technology

• 野上 正行

  Department of Materials Science and Engineering, Nagoya institute of Technology

• 杉原 洋亮

  Department Of Materials Science And Engineering Nagoya Institute Of Technology

関連論文

• Eu^を高濃度に含むEuO-Al_2O_3-B_2O_3-SiO_2ガラスの磁気特性(希土類系物質の精密合成,形態制御および機能物性)

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