0-3型锆钛酸铅/钴铁氧复合陶瓷纳米尺度的磁电效应

项目名称： 0-3型锆钛酸铅/钴铁氧复合陶瓷纳米尺度的磁电效应

项目编号： No.51202078

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： 张悦

作者单位： 华中科技大学

项目金额： 25万元

中文摘要： 二元复合磁电材料在信息存储和磁场探测等方面有较好的应用前景。然而，目前一些和其实用性有关的基础科学问题还没得到很好的解决。比如0-3复合磁电材料磁电电压系数的实验值一般比计算值小一到两个量级，这是因为0-3型材料制备工艺较复杂，因而很多因素（如颗粒尺寸，漏电流，界面反应生成的第二相等）都可能会对磁电性能产生较大影响。近期研究显示当铁磁颗粒尺寸减小到纳米量级，0-3型复合磁电材料的磁电性能会明显改善。因此，本项目计划结合化学方法和放电等离子烧结技术制备0-3型Pb(Zr0.52Ti0.48)O3(PZT) / CoFe2O4(CFO)复合磁电陶瓷，其中CFO以纳米颗粒形式无团聚地分散在PZT陶瓷基体中，进而系统研究其纳米尺寸下的磁电效应，包括CFO尺寸改变对磁电性能的影响，界面微观耦合对纳米尺度范围磁电效应的影响，CFO的尺寸纳米化对漏电流的调控等，并在此基础上有效改善复合陶瓷的磁电性能。

中文关键词： 钴铁氧；复合材料；磁电效应；交换弹簧效应；电场调控

英文摘要： The binary composite magnetoelectric material has good application foreground in the fields of information storage and detection for magnetic field. However,many fundermental scientific problems concerning its application have not been well resolved. For example, the measured magnetoelectric coefficient for the 0-3 type material is usually one or two magnitudes smaller than the calculated value. This is attributed to the complicated synthesis technology, and many factors, such as the particle size, leakage, the second phase due to reaction at boundary, etc, may greatly affect the magnetoelectric properties. The recent studies indicate that the magnetioelectric properties of the 0-3 type material can be greatly improved by controlling particle size on the nanometer scale. Therefore, we plan to prepare the 0-3 type Pb(Zr0.52Ti0.48)O3(PZT)/CoFe2O4(CFO) composite ceramic by combining chemical synthesis methods and Spark-Plasma-Sintering technology, and in the composite ceramic, the CFO nano-particles should be dispersed in PZT matrix without aggregation. Furthermore, the nanometer-scale magnetoelectric effect will also be studied in detail, including the impact of size changing on magnetoelectric effect, the effect of boundary micro-coupling on the nanometer-scale magnetoelectric effect, the manipulation of leakag

英文关键词： cobalt ferrite；composite materials；magnetoelectric effect；exchang spring effect；electric-field control