单相室温多铁性材料的关键基础问题与新体系探索

项目名称： 单相室温多铁性材料的关键基础问题与新体系探索

项目编号： No.51332006

项目类型： 重点项目

立项/批准年度： 2014

项目学科： 一般工业技术

项目作者： 陈湘明

作者单位： 浙江大学

项目金额： 300万元

中文摘要： 本项目拟从BiFeO3多铁性材料的结构性能调控、钨青铜多铁性材料新体系、以及RFeO3陶瓷的多铁性及其调控等三大方面展开系统的基础研究，以解决单相室温多铁性材料的若干基础问题，从不同视角探索室温多铁性材料新体系。揭示BiFeO3与RFeO3、SrTiO3及CaTiO3形成固溶体及多相界的规律，揭示改性BiFeO3-基材料的多铁性机制，找出实现BiFeO3多铁性材料协同改性的有效途径；揭示非充满型、充满型与全充满型钨青铜铁铌酸盐陶瓷的多铁性及其结构根源，探索出钨青铜室温多铁性材料新体系；揭示RFeO3陶瓷的多铁性及其结构根源，探索RFeO3基多铁性陶瓷新体系。本项目的实施，可望给铁电与多铁性理论带来突破，并有力促进我国多铁性材料领域的发展。

中文关键词： 多铁性材料;铁电性;铁磁性;磁电效应;微结构

英文摘要： In the present project, the systematical fundamental investigations are conducted on the modification of structures and properties of BiFeO3 multiferroic materials, exploring multiferroic new systems with tungsten bronze structure, and multiferroic characteristics and their modification of RFeO3 ceramics. Several fundamental key issues will be studied, and the new systems for room-temperature multiferroic materials will be explored from different points of view. The solid solution and MPB structure of RFeO3, SrTiO3 and/or CaTiO3-modified BiFeO3 materials are investigated together with the multiferroic mechanism, and the effective way for achieving the synergistic modification of BiFeO3 multiferroic materials will be determined. The multiferroic characteristics and their structural origin will be revealed for non-filled, filled and fully filled tungsten bronze ceramics, and the room-temperature multiferroic new material systems with tungsten bronze structure will be explored. Moreover, the multiferroic characteristics and their structural origin will be determined for RFeO3 ceramics, and the RFeO3-based multiferroic new material systems will be developed. The present project is expected to greatly contribute to the enrichment of ferroelectric and multiferroic physics, and subsequently the development in the field of multiferroic materials in China will be strongly promoted.

英文关键词： Multiferroic materials;Ferroelectricity;Ferromagnetism;Magnetoelectric effects;Microstructures