锰铁酸钇基多铁性陶瓷的微观结构和电、磁性能

项目名称： 锰铁酸钇基多铁性陶瓷的微观结构和电、磁性能

项目编号： No.51202169

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 无机非金属材料学科

项目作者： 马妍

作者单位： 武汉科技大学

项目金额： 25万元

中文摘要： 寻找室温单相多铁性材料近年来一直都是材料科学和凝聚态物理领域的研究热点。备受关注的六方锰酸钇（YMnO3）具有较高的铁电转变温度（约950 K），且通过Fe部分置换YMnO3中的Mn可以在保持室温铁电性的同时将其较低的磁性转变温度（约77 K）提高到室温以上,然而因为Fe的引入也将使YMnO3的介电损耗和漏导电流增大，阻碍其在信息领域的应用。基于此，本项目拟对锰铁酸钇（YMn1-xFexO3）陶瓷进行阳离子部分置换和氧空位浓度控制来改变其微观结构，并通过系统研究YMn1-xFexO3基固溶体陶瓷的微观结构、多铁性、介电性能及漏导性能来阐明其电、磁性能随微观结构变化的规律，以揭示其电、磁性能的结构根源与物理本质。在此基础上，探讨YMn1-xFexO3基陶瓷的结构性能调控原理，为其电、磁性能优化提供理论依据，并为YMnO3基单相多铁性材料的发展与应用奠定基础。

中文关键词： 多铁性；陶瓷；微结构；磁性；电性能

英文摘要： Searching for room-temperature multiferroic materials with single phase has always been the hot research topic in the field of materials science and condense matter physics. Hexagonal YMnO3 has attracted much scientific attention because of its relatively high ferroelectric transition temperature (about 950 K). By partially substituting Mn for Fe in YMnO3, the room-temperature ferroelectric property can be maintained and the the relatively low magnetic transition temperature of YMnO3 (about 77 K) can be increased to room-temperature or higher. However, because of Fe introducing into YMnO3, the dielectric loss and leakage current are also increased, and this hinders the applications in the field of information. In this study, partial positive-ions substitution and control of oxygen vacancy concentration will be carried out in YMn1-xFexO3 ceramics to change the microstructure.By thoroughly investigating the microstructure, multiferroic, dielectric and leakage properties of YMn1-xFexO3 based ceramics, the dependence of electrical and magnetic properties on the microstructure will be clarified，and then the structural and physical origins for the electrical and magnetic properties will be indicated.On this basis, the controlling principles of structure and property will be discussed.This study will provide theory ev

英文关键词： Multiferroic properties；ceramics；microstructure；magnetic properties；electrical properties