层状类钙钛矿多铁性材料研究进展

Development of Multiferroic Layered-Perovskite-like Oxides

多铁性材料的自旋、电荷、轨道、晶格等多重有序存在着复杂的相互作用,且对磁场、电场、光场、应变和温度等多种外界环境敏感,从而表现出一些新奇的物理现象,使其在存储器、传感器、微波等领域中有重要的应用价值。随着对单相多铁材料研究的深入,人们已从简单钙钛矿结构的多铁性研究转向复杂的层状类钙钛矿体系,其丰富而复杂的结构给人们提供了更广泛的设计和调控空间。介绍并分析了如Double-Perovskite(DP)、Ruddlesden-Popper(RP)、Aurivillius(AU)以及A_nB_nO_(3n+2)系列等层状类钙钛矿多铁性特征的研究进展。人们已发现Bi_2FeCrO_6等DP体系、(1–x)(Ca_ySr_(1–y))_(1.15)Tb_(1.85)Fe_2O_7–xCa_3Ti_2O_7等RP体系、Bi_4NdTi_3Fe_(1–x)Co_xO_(15_–Bi_3NdTi_2Fe_(1–x)Co_xO_(12–δ)等AU体系以及La_6(Ti_(0.67)Fe_(0.33))_6O_(20)层状材料等,均具有室温或近室温多铁性。最后提出了当前面临的问题和对未来的展望。

Single phase multiferroic materials with the coexistence of spin, charge, orbit, and lattice orderings have some physical phenomena, which are sensitive to several external stimulations like magnetic field, electric field, optical field, strain and temperature. These materials can be thus used in the field of storage, sensors, microwave, etc. For room-temperature multiferroics, people pay attention to more complex systems, such as layered-perovskite-like systems, which may provide broader space for designing and controlling new multifunctional materials and devices. This review represented recent development on the multiferroic properties of Double-Perovskite（DP）, Ruddlesden-Popper（RP）, Aurivillius（AU） and AnBnO（3n＋2） series compounds, respectively. All these layered systems, such as DP phases Bi2FeCrO6, RP phases（1–x）（CaySr（1–y））（1.15）Tb（1.85）Fe2O7–xCa3Ti2O7, AU phases Bi4NdTi3Fe（1–x）CoxO（15）–Bi3NdTi2Fe（1–x）CoxO（12–δ） and La6（Ti（0.67）Fe（0.33））6O（20）, show the coexistence of ferroelectricity and ferromagnetism above or near room temperature. Finally, we put forward the current issues we are facing and the outlooks of the future.