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 language | English |
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Pages (from-to) | 257-263 |
Number of pages | 7 |
Journal | Solid State Ionics |
Volume | 154-155 |
DOIs | |
Publication status | Published - 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