褐铁矿
分压
分解
相(物质)
氧气
镧
分析化学(期刊)
氧化物
相变
化学
锶
材料科学
热分解
衍射
结晶学
钙钛矿(结构)
无机化学
热力学
冶金
有机化学
物理
光学
色谱法
作者
James Ovenstone,J. S. White,Scott T. Misture
标识
DOI:10.1016/j.jpowsour.2008.03.033
摘要
High-temperature X-ray diffraction has been used to investigate the phase stability of lanthanum strontium cobalt oxide (LSC) for a range of materials with the formula La1−xSrxCoO3−δ (x = 0.7, 0.4, and 0.2). The stability of LSC increases with La content in low oxygen partial pressures at high temperature. Oxygen vacancy ordering has been observed for all three compositions in either low oxygen pressure or under reducing gas, as evidenced by the formation of the brownmillerite phase. The crystal structure of the vacancy-ordered phase was determined using Rietveld analysis of synchrotron X-ray diffraction data. The decomposition products under low oxygen pressure and in reducing conditions have been identified and characterized, including the phase transition and thermal expansion of the primary decomposition products, LaSrCoO4 and LaSrCoO3.5.
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