Preparation of Ba1−xLaxFeO3−δ (x = 0.1–0.6) with cubic perovskite phase and random distribution of oxide ion vacancy and their electrical conduction property and thermal expansion behavior

Takashi Okiba, Tsubasa Sato, Fumito Fujishiro, Eiki Niwa, Takuya Hashimoto

研究成果: Contribution to journalArticle査読

10 被引用数 (Scopus)

抄録

Single phase of Ba1−xLaxFeO3−δ (x = 0.1–0.6) with cubic perovskite structure and random arrangement of oxide ion vacancy was successfully prepared by sintering under N2 flow whose P(O2) was approximately 10−4 bar. It was revealed that chemical state of Fe was almost 3.0+ at room temperature regardless of La content, resulting in decrease of δ from 0.48 to 0.26 with increasing La content from 0.1 to 0.5. High temperature X-ray diffraction measurements indicated stability of the cubic structure from room temperature to 1000 °C under P(O2) of 10−2 bar. Electrical conductivity increased with increasing La content up to log (σ/S·cm−1) of about 1.5 for Ba0.5La0.5FeO3−δ, indicating high potential as electron and oxide ion mixed conducting material. The variation of electrical conduction behavior from semiconducting to semi-metallic and discontinuous variation of thermal expansion behavior at 300–400 °C under P(O2) of 10−2 bar could be attributed to abrupt oxygen uptake as large as Δδ = 0.185 at the temperature. The decrease of electrical conductivity with increasing temperature and deviation of linear thermal expansion above 400 °C could be ascribed to increase of δ above 400 °C.

本文言語英語
ページ(範囲)76-83
ページ数8
ジャーナルSolid State Ionics
320
DOI
出版ステータス出版済み - 7 2018
外部発表はい

All Science Journal Classification (ASJC) codes

  • 化学 (全般)
  • 材料科学(全般)
  • 凝縮系物理学

フィンガープリント

「Preparation of Ba<sub>1−x</sub>La<sub>x</sub>FeO<sub>3−δ</sub> (x = 0.1–0.6) with cubic perovskite phase and random distribution of oxide ion vacancy and their electrical conduction property and thermal expansion behavior」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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