用溶胶-凝胶方法在LaNiO3底电极上制备了纯的和10%A位La替代的BiFeO3薄膜.研究了室温下薄膜的介电与铁电性质和漏电流性质.铁电性研究表明,通过La替代,薄膜的铁电性得到显著增强,剩余极化强度由1.67 μC/cm2增加到2.20 μC/cm2.介电性质研究表明,在整个测试频率范围内,La替代的薄膜的介电性得到了增强.低频下的介电损耗增加而高频的介电损耗减少.而漏电流特性测试表明,La替代有效的限制了BiFeO3薄膜的漏电流.
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