多铁性材料BiFeO_3的高温铁电相转变研究进展

Research on high temperature ferroelectric phase transition of multiferroic BiFeO_3 and its progress

多铁性材料BiFeO3的高温铁电相转变研究中,无论是对于基础理论研究,还是对于BiFeO3材料的实际应用都具有重要的研究意义。本文系统论述了BiFeO3高温铁电相转变研究的历史、现状和最新进展。分析指出了目前该研究方向存在的关键性难题:由于BiFeO3陶瓷材料较差的高温稳定性,导致BiFeO3高温顺电β相和γ相的晶体结构类型难以确定。最后展望了该研究方向新的发展趋势:高质量BiFeO3单晶的出现有望解决目前存在的研究难题。

The ferroelectric phase transition of multiferroic BiFeO3 at high temperature has a significant impact on both the fundamental theory and practical applications of BiFeO3.This paper presents a systematic review on the history,current situation and the latest progress of studies on the ferroelectric phase transition of multiferroic BiFeO3 at high temperature.Then,the key problem currently existing in this topic is pointed out,which is the contradictory conclusion on the crystal structure of paraelectricβandγphase of BiFeO3 due to its poor stability at high temperature.Finally,an outlook of new trend in this topic is discussed that the above problem would be solved through the investigation on the phase transition of high quality BiFeO3 single crystal at high temperature.