An XAFS study of the local structure of Eu3+ ions in glasses prepared by a levitation technique

Hiroyuki INOUE; Atsunobu MASUNO; Atsuki SAITO; Yasuhiro WATANABE; Kazuya TOKUDA; Yoshihiro SAITO; Junji IIHARA

doi:10.2109/jcersj2.20043

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An XAFS study of the local structure of Eu³⁺ ions in glasses prepared by a levitation technique

Hiroyuki INOUE, Atsunobu MASUNO, Atsuki SAITO, Yasuhiro WATANABE, Kazuya TOKUDA, Yoshihiro SAITO, Junji IIHARA

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Keywords: Aluminosilicate glass, Borate glass, Aluminate glass, Niobate glass, Titanate glass, Optical basicity

JOURNAL FREE ACCESS

2020 Volume 128 Issue 5 Pages 279-283

DOI https://doi.org/10.2109/jcersj2.20043

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Abstract

The local structure around Eu³⁺ ions in Eu-doped glasses prepared by a levitation technique was analyzed by X-ray absorption fine structure spectroscopy. The X-ray absorption near edge structure spectra demonstrated that Eu³⁺ ions in Al₂O₃–SiO₂ binary glasses were partly reduced during high-temperature melting. Extended X-ray absorption fine structure spectra indicated that in La₂O₃–Nb₂O₅, La₂O₃–Al₂O₃, and La₂O₃–TiO₂ glasses that contained a large amount of La₂O₃, the bond lengths between Eu and O were distributed from 2.34 to 2.39 Å. The coordinated polyhedra around the Eu ions could be fitted to a single coordination sphere. It was found that the bond lengths tend to become shorter as the optical basicity of the glass increases. In the Al₂O₃–SiO₂ glasses without any network modifiers, the local structure around the Eu was more complex, leading to the broader first correlation peak of radial structure function.

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