铁酸铋材料的相界调控、相组成优化及其与电学性能的关联研究

项目名称： 铁酸铋材料的相界调控、相组成优化及其与电学性能的关联研究

项目编号： No.51472169

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 一般工业技术

项目作者： 吴家刚

作者单位： 四川大学

项目金额： 83万元

中文摘要： 多铁材料是具潜在重要应用的关键功能材料，相关研究一直是材料科学与工程的国际前沿和热点之一。本项目选择铁酸铋材料体系，针对铁酸铋的相界调控、相组成优化与相变机理、铁酸铋的相变特性及其与电学性能增强的内在关联两个关键科学问题开展研究。本项目的核心思想是综合运用多种措施调控铁酸铋材料的相界，优化其相组成，实现其电学性能增强。主要研究内容包括：采用多种调控措施开展铁酸铋陶瓷和薄膜的相界调控；研究铁酸铋材料的相界调控规律和相变物理机制；阐明铁酸铋材料的相组成与电学性能的关联；掌握铁酸铋材料的相界调控、相组成优化与电学性能增强的规律，阐明其电学性能增强的物理机理。本项目重要且紧迫，以期在铁酸铋材料体系基础研究中有重要突破；发表高水平SCI收录论文15余篇；授权（或申请）发明专利2项以上；培养博硕士研究生8余人；使我国铁酸铋材料的相关研究成果继续处于国际前沿，并对我国铁电压电学发展具重要意义。

中文关键词： 多铁材料；铁酸铋；相界调控；电学性能；物理机制

英文摘要： Multiferroics are key materials with potential important applications, and the related research is one of the international forefronts and hot topics in the field of materials science and engineering. Choosing the bismuth ferrite material system,the related researches will be conducted against two key scientific questions, which are assigned to Phase boundary modification, phase compositions optimization, and phase transition mechanism of bismuth ferrite materials and Interrelationship between phase transition characteristics and enhanced electrical properties of bismuth ferrite materials. The core idea of this project is to modify the phase boundary by using the integrated use of a variety of measurements, to optimize the phase compositions, to realize the enhancement of electrical properties, and to explain the underlying physical mechanisms of bismuth ferrite materials.The research contents are listed as followed: Modifying the phase boundary of bismuth ferrite ceramics and thin films by several methods; Investigating the regulation of phase boundary modification and physical mechanisms of phase transition of bismuth ferrite materials; Illuminating the interrelationship between phase compositions and electrical properties of bismuth ferrite materials; Mastering the regulation of phase boundary modification, phase compostions optimization, and enhanced electrical properties of bismuth ferrite materials,and illuminating the physical mechanisms of its enhanced electrical properties. This project is both important and urgent, expected to achieve an important breakthrough in the basic researches of bismuth ferrite materials; more than fifteen papers cited by SCI will be published; over two invention patents will be authorized or applied; more than eight MSc and PhD candidates will be cultivated; keeping the related research achievement of bismuth ferrite materials in our country at the international forefront, having an important significance for the development of ferroelectrics and piezoelectrics.

英文关键词： Multiferroic Materials;Bismuth Ferrite;Phase Boundary Modification;Electrical Properties;Physical Mechanism