溶胶-凝胶法制备渗流型超高性能铁电铁磁复相陶瓷材料研究

项目名称： 溶胶-凝胶法制备渗流型超高性能铁电铁磁复相陶瓷材料研究

项目编号： No.50872120

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 化学工业

项目作者： 杜丕一

作者单位： 浙江大学

项目金额： 35万元

中文摘要： 多铁性材料由于其特殊的性能可用于多种功能器件。配合目前电子元器件及半导体电路制备工艺，复相多铁性全陶瓷的研发为多铁性材料应用的进一步拓展开辟了新途径。受两相复合定律影响，在复相材料中两相性能将明显下降。本项目以B(S)T/N(Z)FO为研究对象，引入渗流的概念，并通过调节铁磁相本身的电导性将其用作为导电相材料，特别是利用溶胶凝胶及原位形成技术，通过形成在极小尺度上均匀分布且铁磁相被极薄一层铁电相很好包裹的两相，成功解决了高渗流阈值的难题，成功制备了全陶瓷渗流型超高介高磁复合材料；更进一步，建立了通过抑制空间电荷传输降低损耗的思想，在系统中形成或引入高阻界面层，成功解决了在类似陶瓷体系中通常存在高损耗的难题，在高介高磁的基础上获得了低损耗全陶瓷复相材料，对进一步加快在新型电子元器件方面的应用将及具科学意义和使用价值，有利于促进相关科学领域的发展。特别在电场可调磁电器件等领域应用前景广阔。

中文关键词： 渗流;多铁性;高介高磁;低损耗;复相材料

英文摘要： Multi-ferro materials can be applied in many functional devices due to its special properties. The all ceramic multi-ferro composite, which is suitable to the technology of electronic and integrated circuit, is a new materials in application of multi-ferro devices. However, the property of each of the phases is normally decreased in a dual phase composite according to the complex law. In this project, introducing percolation effect successfully, we investigate the typical ferroelectric/ferromagnetic composite system of B(S)T/N(Z)FO, in which the ferromagnetic phase of N(Z)FO will be used as conductive phase after improving its conductivity. For the all ceramic composite with both high percolation effect and high percolation threshold, and thus high permittivity and high permeability, the sol-gel in situ route will be used, under which uniformly mixed phases with ferromagnetic being enwrapped by only a thin ferroelectric layer can be formed. Furthermore, for decreasing the dielectric loss of the ceramic composite which occurs commonly in the ceramic composite, the way of resisting against transportation of the space charge is designed and hence an obstructing layer with high resistance will be introduced into the interfaces among phase particles. Based on high dielectric constant and high magnetic permeability, the low dielectric loss in ceramic composite is of great importance in promoting the development of magnetoelectric devices.

英文关键词： Percolation;Multifferoic;High permittivity and high permeability;Low dielectric loss;Composite