铁电/铁磁三相颗粒复合材料的磁电性能计算  

Calculations of magnetoelectric properties in three-phase ferroelectric and ferromagnetic particulate composites

作　　者：施展[1] 南策文[1] 

机构地区：[1]清华大学材料科学与工程系,新型陶瓷与精细工艺国家重点实验室,北京100084

出　　处：《物理学报》2004年第8期2766-2770,共5页Acta Physica Sinica

基　　金：国家自然科学基金 (批准号 :5 0 2 3 2 0 3 0 );国家重点基础研究发展规划 (批准号 :2 0 0 2CB613 3 0 3 )资助的课题~~

摘　　要：采用格林函数方法给出了三相复合材料的磁电系数的解析式 ,对稀土 铁合金 压电陶瓷 高分子 (Terfenol D PZT PVDF)三相颗粒复合材料的磁电系数进行了计算 .计算结果给出了复合材料的磁电性能与材料显微结构的关系 ,包括三相颗粒复合材料的磁电性能随组分、颗粒的长径比、PZT颗粒的电极化方向以及外磁场的变化趋势 ,可为实验设计提供参考和指导 .通过合理设计 ,三相磁电复合材料的性能可以达到数百mV A .作为一种新的磁电复合材料 。By the Green's function technique, we obtain the analytic expressions of the effective magnetoelectric property of composites and calculate the effective magnetoelectric properties of the three phase particulate composites made of rare earth iron alloys, piezoelectric ceramics and polymer (Terfenol D/PZT/PVDF). Our results show a strong influence of composite microstructure including the phase composition, aspect ratio of particles, orientation of polarization in PZT particles and applied bias field on the magnetoelectric properties. These numerical results provide guidelines for experimental design of the composites. After optimum design, the magnetoelectric voltage coefficient of these composites may reach as high as hundreds mV/A. As a new kind of magnetoelectric composite, such three phase composites are expected to be a novel important kind of magnetoelectric materials because of their good magnetic electrical response and easy fabrication.

关 键 词：铁电/铁磁三相颗粒复合材料 格林函数 磁电效应 压电陶瓷 磁导率 

分 类 号：TB331[一般工业技术—材料科学与工程]