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: Conference article査読

20 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Published - 2004 11月 30
イベントFourteenth International Conference on Solid State Ionics - Monterey, CA., United States
継続期間: 2003 6月 222003 6月 27

ASJC Scopus subject areas

  • 化学 (全般)
  • 材料科学(全般)
  • 凝縮系物理学


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