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PMNNT/CoFe₂O₄复合材料的结构和磁电性能

STRUCTURE AND MAGNETIC ELECTRIC PROPERTIES OF PMNNT/CoFe₂O₄ COMPOSITES

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【Author】 ZHOU Jianping,HE Hongcai,SHI Zhan,ZHANG Xiaowen,PAN Jingsong,NAN Cewen(State Key Laboratory of Advance Ceramics and Fine Processing,Department of Materials Science and Engineering,Tsinghua University,Beijing 100084,China)

【机构】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；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；北京100084；

【摘要】采用固相法制备了Pb[(Mg1/3Nb2/3)0.536(Ni1/3Nb2/3)0.128Ti0.336]O3(PMNNT)和CoFe2O4不同组分的颗粒复合材料。复合材料在1200℃烧结后,仍保持PMNNT和CoFe2O4结构,没有新相生成,但由于不同相之间存在元素扩散,材料的性能有了改变。该材料具有铁电和铁磁特征,表现出较高的介电常数,高压电系数,较高的饱和磁化强度,低矫顽力和高磁致伸缩效应等特征,并表现出磁电效应。更多还原

【Abstract】 Magnetoelectric particulate composites of Pb[(Mg1/3Nb2/3)0.536(Ni1/3Nb2/3)0.128Ti0.336]O3(PMNNT)and CoFe2O4 with various compositions were prepared by conventional ceramic calcining.PMNNT and CoFe2O4 structures were kept and no new phases were formed in the samples after sintering at 1 200 ℃.However,element diffusion occurred between PMNNT and CoFe2O4 phases.The composites exhibit good ferroelectric and magnetic properties,such as higher dielectric constant,high piezoelectric con-stant,high saturation magnetization,low coercivity and high magnetostriction.The composites also demonstrated a magnetoelectric effect.更多还原