采用固相合成法制备出致密的FeTiNbO6陶瓷,研究了材料的相结构与电学行为.结果显示,样品为四方金红石结构,晶胞参数a=b=0.4652 nm,c=0.3013 nm.相对于纯金红石型TiO2,FeTiNbO6陶瓷晶格畸变增大,诱发体系出现铁电行为.此外,样品呈现弥散相变与频率色散现象,这与金红石结构中等同八面体中心位不等价离子的占据相关.样品的直流电导率主要来源于氧空位的电离与迁移,其转变点靠近相变区域.研究表明FeTiNbO6是一种具有应用潜力的新型无铅弛豫铁电体.
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