Oxide ion and electron transport properties in lanthanum silicate oxyapatite ceramics

Atsushi Mineshige, Hiroyuki Mieda, Mitsuaki Manabe, Takahiro Funahashi, Yusuke Daiko, Tetsuo Yazawa, Mina Nishi, Katsuhiko Yamaji, Teruhisa Horita, Koji Amezawa, Keiji Yashiro, Tatsuya Kawada, Hideki Yoshioka

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

An oxygen-excess-type lanthanum silicate (LSO) solid electrolyte with high chemical stability as well as high ion conductivity was developed by optimizing the chemical composition, La9.333 + x(Si6 - yAl y)O26 + 1.5x - 0.5y. It was found that La 10(Si5.8Al0.2)O26.9 (x = 0.667, y = 0.2) exhibited the highest conductivity among them, and addition of a small amount of iron was effective for the improvement of its chemical stability. The LSO specimen of x = 0.667 and y = 0.2 with iron addition (0.5 mol%) was chemically stable and had a conductivity of 5.6 × 10- 2 S cm- 1 under air at 1073 K, while its electronic conductivity was less than 2.0 × 10- 4 S cm- 1 at the same temperature. The oxygen tracer diffusion coefficient, DO* of this material was determined as 2.0 × 10- 8 cm2 s- 1 at 1073 K.

Original languageEnglish
Pages (from-to)555-558
Number of pages4
JournalSolid State Ionics
Volume262
DOIs
Publication statusPublished - 2014 Sep 1

Keywords

  • Apatite
  • Diffusion coefficient
  • Lanthanum silicate
  • Oxyapatite
  • Solid electrolyte
  • Solid oxide fuel cell

ASJC Scopus subject areas

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

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    Mineshige, A., Mieda, H., Manabe, M., Funahashi, T., Daiko, Y., Yazawa, T., Nishi, M., Yamaji, K., Horita, T., Amezawa, K., Yashiro, K., Kawada, T., & Yoshioka, H. (2014). Oxide ion and electron transport properties in lanthanum silicate oxyapatite ceramics. Solid State Ionics, 262, 555-558. https://doi.org/10.1016/j.ssi.2014.04.009