Magnetic Properties of EuO-Al2O3-B2O3-SiO2 Glasses with High Eu2+ Concentration

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概要

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• Fabrication of EuO-Al2O3-B2O3-SiO2 glasses with high-concentration of Eu2+ ions was attempted in N2 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 Eu2+ 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 Eu2+ ions in the glasses, in whose fabrication process a part of Eu2+ ions were oxidized to Eu3+. We also measured FT-IR and Raman spectra and discussed the stable valence state of europium ions in the studied glass-matrixes.

著者

• NOGAMI Masayuki

  Department of Materials Science and Engineering, Nagoya Institute of Technology

• Nogami Masayuki

  Department Of Materials Science And Engineering Graduate School Of Engineering Nagoya Institute Of T

• Hayakawa Tomokatsu

  Department of Materials Science and Engineering, Nagoya Institute of Technology, Gokiso, Showa, Nagoya 466-8555, Japan

• SUGIHARA Yousuke

  Department of Materials Science and Engineering, Nagoya institute of Technology

• HAYAKAWA Tomokatsu

  Department of Materials Science and Engineering, Nagoya institute of Technology

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