Abstract By considering the fact that oxygen vacancies are always the integral part of oxides when prepared at high temperature, variation in oxygen vacancy concentration was introduced in KNbO3 by varying calcinations temperature of precursors. A similar kind of variation was also introduced in KNbO3 by varying La3+ doping concentration. Our analysis shows that the phase formation in KNbO3 greatly responds to the variation in concentration of oxygen vacancy. It was found that, when KNbO3 bears more oxygen vacancies orthorhombic phase formation at room temperature becomes favorite otherwise cubic phase is favored. The result seems to be highly important to look insight into the mechanism of paraelectric-ferroelectric phase transition.

中文翻译：

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KNbO 3 中氧空位依赖的结构相

摘要 考虑到在高温下制备时氧空位始终是氧化物的组成部分，通过改变前驱体的煅烧温度，在 KNbO3 中引入了氧空位浓度的变化。通过改变 La3+ 掺杂浓度，在 KNbO3 中也引入了类似的变化。我们的分析表明，KNbO3 中的相形成对氧空位浓度的变化有很大的响应。发现，当 KNbO3 具有更多的氧空位时，室温下斜方相的形成变得有利，否则立方相是有利的。结果似乎对于深入了解顺电-铁电相变机制非常重要。