多铁性复合材料的力磁电多场耦合与结构特性

项目名称： 多铁性复合材料的力磁电多场耦合与结构特性

项目编号： No.11272174

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 方菲

作者单位： 清华大学

项目金额： 95万元

中文摘要： 多铁性材料集铁弹、铁电、铁磁等特性为一身。它既能满足对材料多维度使用功能的要求，又契合了器件集成化、小型化的发展需求；是一种既具有巨大的商业应用前景，又蕴含丰富科学内涵的智能材料。本项目拟以多铁性复合材料（包括块状和薄膜）为研究对象，系统地研究在外场（力、热、磁或电场）下，铁电畴或磁畴结构的演化，及其与磁电耦合效应之间的内在联系。本项目将：研究影响多铁性复合材料磁电耦合性能的外场条件和微结构影响因素，为新型高性能磁电复合材料的设计提供实验依据；在实验基础上建立和发展基于微力学的磁电耦合理论，从而预测或评价磁电复合材料在服役环境下的性能。研究成果将为固体力学、材料制备学、显微观察学之间架设联系桥梁，使智能材料多场耦合力学的学科内涵得以拓展和延伸。同时，研究成果也将为新型磁电材料和器件的设计提供实验依据和理论指导。

中文关键词： 多铁性复合材料；磁电耦合；微结构；铁电畴；

英文摘要： Multiferroics is a kind of smart materials which combines at least ferroelectric and ferromagnetic behaviors. Multiferroics adds degree of freedom in the design of devices, and possesses both great marketing potentials and plenty of fundamental scientific research possibilities. The proposal aims at revealing the microstructure evolutions, and their relationship with the magnetoelectric coupling of the multiferroic composites (both of bulk and thin films), upon the applied thermal, mechanical, and magnetic (or electrical) fields. The effects of both the external fields and the microstructure characteristics of the multiferroic composites will be evaluated, providing the experimental basis in designing novel high performance multicomposites. Based on the experimental results, micromechanic model(s) of magnetoelectric coupling will be provided, which aims at predicting or evaluating the magnetoelectric behavior of the multiferroic composites under the application. The reults will be of great importance for the deepening and widening of the discipline of Mechanics of Smart Materials, bridging the gap between the two disiplines of Mechanics of solids, and Materials Science and Engineering. It will also of great importance for the design and development of the new generation magnetoelectric materials and devices.

英文关键词： Multiferroic composites；magnetoelectric coupling；microstructure；ferroelectric domain；