Preparation of lanthanum silicate electrolyte with high conductivity and high chemical stability

Atsushi Mineshige, Hikaru Hayakawa, Takuma Nishimoto, Akie Heguri, Tetsuo Yazawa, Yuki Takayama, Yasushi Kagoshima, Hidekazu Takano, Shingo Takeda, Junji Matsui

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Effects of dopant content and synthesis temperature on phase relations and conducting behavior of lanthanum silicate, La9.33+xSi6O26+1.5x (LSO) electrolytes were investigated. The La-excess-type Fe-doped LSO, La10(Si5.5Fe0.5)O26.75 synthesized at 1973 K showed lower grain boundary as well as grain interior resistances, and then, had high total conductivity (6.9 × 10−3 S cm−1 at 873 K and 3.6 × 10−5 S cm−1 at 573 K). In addition, the chemical instability owing to a high lanthanum activity in the La-excess-type LSO (x = 0.67) specimen could be eliminated by incorporating iron into the specimen. The synchrotron radiation microbeam X-ray diffraction technique revealed that this specimen contains a small amount of new secondary phase, which differs from the situation found in a highly conductive but chemically unstable Al-doped LSO specimen with the same x value and the same synthesis temperature.

Original languageEnglish
Pages (from-to)223-227
Number of pages5
JournalSolid State Ionics
Volume319
DOIs
Publication statusPublished - 2018 Jun

Keywords

  • Apatite
  • Lanthanum silicate
  • Synchrotron radiation microbeam

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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