多铁性与磁电耦合效应在新型电子器件方面有潜在应用前景。但已报导的大部分磁致铁电极化多铁性材料的磁电耦合温度都较低，探索开发新型高温多铁性材料对于推动此类材料的实用化至关重要。本项目采用高温高压方法制备A位为Mn离子的类钙钛矿氧化物Mn2BB՛O6。系统阐述B/B՛位离子种类、有序度，样品的制备工艺及后期热处理工艺等因素对样品晶体结构和磁结构的影响，探索与设计新型Mn2BB՛O6磁致铁电极化多铁性材料。通过磁性、电输运、介电、磁电耦合效应等宏观物性测量，结合中子衍射等先进实验方法，阐明新型磁致多铁性材料磁电耦合的微观物理机制。

Multiferroic and magnetoelectric effect has potential applications in novel electronic devices. However, most of the muiltiferroics reported to date have relatively low magnetoelectric coupling temperatures. It is very important to explore the novel high-temperature multiferroics for the practical application. In this project, the double perovskite like oxide Mn2BB՛O6 with Mn ions in the A site will be prepared by high temperature and high pressure method. The B/B՛ ion species, B/B՛ ion՛s degree of order, the sample preparation and annealing process, and other factors that affect the sample crystal structure and magnetic structure will thoroughly study. The purpose is to explore and design the new Mn2BB՛O6 multiferroics. In addition, the physical mechanism of the magnetoelectric coupling of the novel multiferroics will be studied by macroscopic physical measurements such as magnetic, electrical transport, dielectric and magnetoelectric coupling effects, combined with advanced experimental methods such as neutron diffraction.