Phase behavior of lanthanum strontium manganites
The phase stability of Sr-doped LaMnO{sub 3} (LSM) perovskite in the La-Sr-Mn-O system was investigated as a function of Sr content and A/B cation ratio. The perovskite structure changed with both Sr content and A/B cation ratio. As the Sr content was increased to 0.2 mol, the perovskite structure adopted an orthorhombic distortion. This changed to a monoclinic or hexagonal structure for 0.2 {le} Sr {le} 0.3 mol. When the Sr content increased to 0.3 mol, the structure reverted to orthorhombic symmetry. Data from X-ray powder diffractometry, scanning electron microscopy, transmission electron microscopy, and energy-dispersive X-ray emission spectroscopy, showed that secondary phases in the La-Sr-Mn-O system were underdeveloped with respect to changes of the doped Sr content, A/B cation ratio, and thermal history. X-ray detectable minor phases present in the LSM material were Mn{sub 3}O{sub 4}, (La, Sr)Mn{sub 2}O{sub 4}, La{sub 2}O{sub 3}, La(OH){sub 3}, (La, Sr){sub 3}Mn{sub 2}O{sub 7}, and (La, Sr){sub 2}MnO{sub 4}.
- Research Organization:
- Univ. of Washington, Seattle, WA (US)
- Sponsoring Organization:
- US Department of Energy
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 20000086
- Journal Information:
- Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 8 Vol. 146; ISSN JESOAN; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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