In situ XRD study on oxygen-excess LaMnO3

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

Research output: Contribution to journalConference articlepeer-review

21 Citations (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.

Original languageEnglish
Pages (from-to)383-386
Number of pages4
JournalSolid State Ionics
Issue number1-4
Publication statusPublished - Nov 30 2004
Externally publishedYes
EventFourteenth International Conference on Solid State Ionics - Monterey, CA., United States
Duration: Jun 22 2003Jun 27 2003

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics


Dive into the research topics of 'In situ XRD study on oxygen-excess LaMnO3'. Together they form a unique fingerprint.

Cite this