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 journalArticlepeer-review

5 Citations (Scopus)


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 languageEnglish
Pages (from-to)30-33
Number of pages4
JournalMaterials Chemistry and Physics
Issue number1
Publication statusPublished - 2008 May 15
Externally publishedYes


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

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics


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