Lattice creation and annihilation of LaMnO3+δ caused by nonstoichiometry change

Shogo Miyoshi, Jeong Oh Hong, Keiji Yashiro, Atsushi Kaimai, Yutaka Nigara, Kenichi Kawamura, Tatsuya Kawada, Junichiro Mizusaki

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

In order to identify the majority ionic defect of La1-xSrxMnO3+δ in the oxygen-excess region, a dilatometry was made on La0.96MnO2.94+δ at a fixed temperature (1273 K) by varying the ambient oxygen partial pressure. The specimen of La0.96MnO2.94+δ expanded with increasing PO2 in the region of δ > 0, while the unit cell volume was known to decrease with increasing PO2. The morphological evolution was also observed on the surface of the La0.96MnO2.94+δ specimen after annealing in an oxidizing atmosphere, indicating that the new lattices were created. From these results, it is concluded that the majority ionic defect of the perovskite oxide, La1-xSrxMnO3+δ, is cation vacancies in the oxygen-excess region.

Original languageEnglish
Pages (from-to)257-263
Number of pages7
JournalSolid State Ionics
Volume154-155
DOIs
Publication statusPublished - 2002 Dec 2

Keywords

  • Cation vacancy
  • Dilatometry
  • LaMnO
  • Microstructure evolution
  • Oxygen-excess nonstoichiometry

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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