In situ XRD study on oxygen-excess LaMnO3

Shogo Miyoshi, Atsushi Kaimai, Hiroshige Matsumoto, Keiji Yashiro, Yutaka Nigara, Tatsuya Kawada, Junichiro Mizusaki

研究成果: ジャーナルへの寄稿会議記事査読

21 被引用数 (Scopus)


For LaMnO3+δ with oxygen-excess nonstoichiometry, in situ X-ray diffractometry was performed under high temperatures and precisely controlled oxygen partial pressures, PO2. A rhombohedral phase was observed under most experimental conditions. With temperature rising, the lattice volume increased linearly in a low temperature region; the coefficient of linear thermal expansion (CTE) was 1.06×10-5K-1. In a high temperature region, the temperature dependence of the lattice volume upwardly deviated from the linearity, indicating that the unit cell expanded upon decrease in excess oxygen. The nonstoichiometry coefficient of the linear isothermal expansion was calculated at 5×10-2 using literature data on δ(T, PO2). The rhombohedral distortion escalated with temperature and PO2 decreasing. The dependence of cell volume and distortion on nonstoichiometry is well interpreted as the effect of variation in the ionic radius and tolerance factor.

ジャーナルSolid State Ionics
出版ステータス出版済み - 11月 30 2004
イベントFourteenth International Conference on Solid State Ionics - Monterey, CA., 米国
継続期間: 6月 22 20036月 27 2003

!!!All Science Journal Classification (ASJC) codes

  • 化学一般
  • 材料科学一般
  • 凝縮系物理学


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