A位有序四重钙钛矿氧化物:结构、物性和展望

A-Site Ordered Quadruple Perovskite Oxides:Structures,Properties and Prospects

A位有序四重钙钛矿氧化物AA′3B4O12具有丰富的物理性质和优异的材料性能,是当今凝聚态物理和材料科学的重要研究对象。相较于简单的ABO3型钙钛矿,在A位有序四重钙钛矿氧化物中,3/4的A位离子被过渡金属离子A′所取代,形成了1∶3的A/A′有序结构。因此,A位有序四重钙钛矿氧化物中的磁-电相互作用不再局限于B位子晶格内部,新颖的A′-A′、A′-B等磁-电相互作用也随之产生,从而展现出许多新现象和新物理机制,并为未来的实际应用提供了材料基础。围绕几种具有代表性的A位有序四重钙钛矿氧化物,回顾其研究脉络,对其晶体结构、物理性质和内在机理进行简单介绍,并对这类材料体系的研究方向和应用前景做出一些展望。

A-site ordered quadruple perovskite oxides with a formula as AA′3B4O12 exhibit multiple physical properties and superior performances,thus act as important subjects of current condensed matter physics and material science.Compared to the simple ABO3 perovskite,in the A-site ordered quadruple perovskite three quarters of the A atoms are replaced by transition metal Aʹ,forming ordered A/Aʹoccupancy with a 1∶3 ratio.As a result,the electric and magnetic interactions such as Aʹ-Aʹand Aʹ-B can occur,leading to novel phenomena and new physics.Here we focus on several representative A-site ordered quadruple perovskites,recall their researches,briefly introduce their structures,physical properties and inner mechanisms,and discuss the opportunities for both fundamental studies and potential applications.