High-temperature defect and crystal structure of perovskite type oxide ion conductor La0.8Sr0.2Ga0.8Mg 0.15Co0.05O3-δ

S. Nakayama, S. Hashimoto, K. Sato, K. Yashiro, K. Amezawa, J. Mizusaki

研究成果: Conference contribution

7 被引用数 (Scopus)

抄録

A series of doped LaGaO3 perovskite type oxides is considered as the electrolyte of solid oxide fuel cells (SOFCs), due to their high oxide ionic conductivity. However, detailed defect chemistry, particularly the relationship between oxygen nonstoichiometry and lattice parameter under operating condition of SOFCs has not been understood well so far. To clarify the relationship, measurement was made on the oxygen nonstoichiometry of La 0.8Sr0.2Ga0.8Mg0.15Co 0.05O3-δ by high temperature gravimetry, and on the crystal structure by in-situ high temperature XRD. Oxygen vacancy concentration increases with decrease in log (P(O2)) and increase in temperature, finally converging on 3-δ=2.80. The large variation in the oxygen nonstoichiometry results from valence change of Co. The valence of Co at 3-δ=2.80 is nearly +2.0, whereas, the valence of Co at 3-δ=2.85 is considered close to +4.0. In-situ high temperature XRD confirmed that the oxygen vacancy formation led to increase in the lattice parameter, namely chemical expansion induced by oxygen nonstoichiometry.

本文言語English
ホスト出版物のタイトルECS Transactions - Solid Oxide Fuel Cells 11 (SOFC-XI)
ページ1701-1708
ページ数8
2 PART 2
DOI
出版ステータスPublished - 2009
イベント11th International Symposium on Solid Oxide Fuel Cells (SOFC-XI)- 216th ECS Meeting - Vienna, Austria
継続期間: 2009 10 42009 10 9

出版物シリーズ

名前ECS Transactions
番号2 PART 2
25
ISSN(印刷版)1938-5862
ISSN(電子版)1938-6737

Other

Other11th International Symposium on Solid Oxide Fuel Cells (SOFC-XI)- 216th ECS Meeting
国/地域Austria
CityVienna
Period09/10/409/10/9

ASJC Scopus subject areas

  • 工学(全般)

フィンガープリント

「High-temperature defect and crystal structure of perovskite type oxide ion conductor La<sub>0.8</sub>Sr<sub>0.2</sub>Ga<sub>0.8</sub>Mg <sub>0.15</sub>Co<sub>0.05</sub>O<sub>3-δ</sub>」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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