Electrical properties of (Na2O)35.7(RE2O3)7.2(GeO2)57.1 (RE = Sm, Gd, Dy, Y, Ho, Er and Yb) glasses

Yan Lin Aung; Kazunari Itani; Taro Asahi; Hajime Kiyono; Masatomi Sakamoto; Susumu Nakayama

doi:10.1016/j.matchemphys.2007.10.026

Electrical properties of (Na₂O)_35.7(RE₂O₃)_7.2(GeO₂)_57.1 (RE = Sm, Gd, Dy, Y, Ho, Er and Yb) glasses

Yan Lin Aung, Kazunari Itani, Taro Asahi, Hajime Kiyono, Masatomi Sakamoto, Susumu Nakayama

研究成果: Article › 査読

5 被引用数 (Scopus)

抄録

Seven kinds of sodium rare earth germanate glasses, (Na₂O)_35.7(RE₂O₃)_7.2(GeO₂)_57.1 (RE = Sm, Gd, Dy, Y, Ho, Er, and Yb), were prepared, and their properties as a Na⁺ ionic conductor were compared with those of the previously reported silicate glass analogues, (Na₂O)_35.7(RE₂O₃)_7.2(SiO₂)_57.1. Density was increased with increasing the atomic weight of rare earth element. Crystallization temperature for the (Na₂O)_35.7(Sm₂O₃)_7.2(GeO₂)_57.1 glass was about 600 °C, which was about 150 °C lower than that of the corresponding (Na₂O)_35.7(Sm₂O₃)_7.2(SiO₂)_57.1 glass. Conductivities of the Ge system glasses were little affected by the change in ionic radius of the rare earth. The conductivities of the (Na₂O)_35.7(Y₂O₃)_7.2(GeO₂)_57.1 and (Na₂O)_35.7(Y₂O₃)_7.2(SiO₂)_57.1 glasses were almost the same, though the covalent bond character between Na⁺ and oxide ions was found to be weakened in the Ge system from their ²³Na NMR spectra.

本文言語	English
ページ（範囲）	30-33
ページ数	4
ジャーナル	Materials Chemistry and Physics
巻	109
号	1
DOI	https://doi.org/10.1016/j.matchemphys.2007.10.026
出版ステータス	Published - 2008 5月 15
外部発表	はい

ASJC Scopus subject areas

材料科学（全般）
凝縮系物理学

文献へのアクセス

10.1016/j.matchemphys.2007.10.026

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引用スタイル

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title = "Electrical properties of (Na2O)35.7(RE2O3)7.2(GeO2)57.1 (RE = Sm, Gd, Dy, Y, Ho, Er and Yb) glasses",

abstract = "Seven kinds of sodium rare earth germanate glasses, (Na2O)35.7(RE2O3)7.2(GeO2)57.1 (RE = Sm, Gd, Dy, Y, Ho, Er, and Yb), were prepared, and their properties as a Na+ ionic conductor were compared with those of the previously reported silicate glass analogues, (Na2O)35.7(RE2O3)7.2(SiO2)57.1. Density was increased with increasing the atomic weight of rare earth element. Crystallization temperature for the (Na2O)35.7(Sm2O3)7.2(GeO2)57.1 glass was about 600 °C, which was about 150 °C lower than that of the corresponding (Na2O)35.7(Sm2O3)7.2(SiO2)57.1 glass. Conductivities of the Ge system glasses were little affected by the change in ionic radius of the rare earth. The conductivities of the (Na2O)35.7(Y2O3)7.2(GeO2)57.1 and (Na2O)35.7(Y2O3)7.2(SiO2)57.1 glasses were almost the same, though the covalent bond character between Na+ and oxide ions was found to be weakened in the Ge system from their 23Na NMR spectra.",

keywords = "Differential thermal analysis (DTA), Electrical conductivity, Nuclear magnetic resonance (NMR)",

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AU - Aung, Yan Lin

AU - Itani, Kazunari

AU - Asahi, Taro

AU - Kiyono, Hajime

AU - Sakamoto, Masatomi

AU - Nakayama, Susumu

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N2 - Seven kinds of sodium rare earth germanate glasses, (Na2O)35.7(RE2O3)7.2(GeO2)57.1 (RE = Sm, Gd, Dy, Y, Ho, Er, and Yb), were prepared, and their properties as a Na+ ionic conductor were compared with those of the previously reported silicate glass analogues, (Na2O)35.7(RE2O3)7.2(SiO2)57.1. Density was increased with increasing the atomic weight of rare earth element. Crystallization temperature for the (Na2O)35.7(Sm2O3)7.2(GeO2)57.1 glass was about 600 °C, which was about 150 °C lower than that of the corresponding (Na2O)35.7(Sm2O3)7.2(SiO2)57.1 glass. Conductivities of the Ge system glasses were little affected by the change in ionic radius of the rare earth. The conductivities of the (Na2O)35.7(Y2O3)7.2(GeO2)57.1 and (Na2O)35.7(Y2O3)7.2(SiO2)57.1 glasses were almost the same, though the covalent bond character between Na+ and oxide ions was found to be weakened in the Ge system from their 23Na NMR spectra.

AB - Seven kinds of sodium rare earth germanate glasses, (Na2O)35.7(RE2O3)7.2(GeO2)57.1 (RE = Sm, Gd, Dy, Y, Ho, Er, and Yb), were prepared, and their properties as a Na+ ionic conductor were compared with those of the previously reported silicate glass analogues, (Na2O)35.7(RE2O3)7.2(SiO2)57.1. Density was increased with increasing the atomic weight of rare earth element. Crystallization temperature for the (Na2O)35.7(Sm2O3)7.2(GeO2)57.1 glass was about 600 °C, which was about 150 °C lower than that of the corresponding (Na2O)35.7(Sm2O3)7.2(SiO2)57.1 glass. Conductivities of the Ge system glasses were little affected by the change in ionic radius of the rare earth. The conductivities of the (Na2O)35.7(Y2O3)7.2(GeO2)57.1 and (Na2O)35.7(Y2O3)7.2(SiO2)57.1 glasses were almost the same, though the covalent bond character between Na+ and oxide ions was found to be weakened in the Ge system from their 23Na NMR spectra.

KW - Differential thermal analysis (DTA)

KW - Electrical conductivity

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