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

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

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.

Original language	English
Pages (from-to)	30-33
Number of pages	4
Journal	Materials Chemistry and Physics
Volume	109
Issue number	1
DOIs	https://doi.org/10.1016/j.matchemphys.2007.10.026
Publication status	Published - 2008 May 15
Externally published	Yes

Keywords

Differential thermal analysis (DTA)
Electrical conductivity
Nuclear magnetic resonance (NMR)

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics

Access to Document

10.1016/j.matchemphys.2007.10.026

Cite this

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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)",

author = "Aung, {Yan Lin} and Kazunari Itani and Taro Asahi and Hajime Kiyono and Masatomi Sakamoto and Susumu Nakayama",

year = "2008",

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doi = "10.1016/j.matchemphys.2007.10.026",

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T1 - Electrical properties of (Na2O)35.7(RE2O3)7.2(GeO2)57.1 (RE = Sm, Gd, Dy, Y, Ho, Er and Yb) glasses

AU - Aung, Yan Lin

AU - Itani, Kazunari

AU - Asahi, Taro

AU - Kiyono, Hajime

AU - Sakamoto, Masatomi

AU - Nakayama, Susumu

PY - 2008/5/15

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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

KW - Nuclear magnetic resonance (NMR)

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