铌酸钾钠/铁酸钴铜多铁性磁电复合材料的制备及性能研究  

Fabrication and Properties of the Potassium Sodium Niobate/Cobalt Copper Ferritemultiferroic Magnetoelectric Composites

作　　者：轩敏杰[1] 刘心宇[1,2] 袁昌来[1,2] 许积文[3] 马家峰[1,2] 

机构地区：[1]桂林电子科技大学材料科学与工程学院,桂林541004 [2]中南大学材料科学与工程学院,长沙410083 [3]陕西师范大学材料科学与工程学院,西安710100

出　　处：《无机材料学报》2012年第10期1042-1046,共5页Journal of Inorganic Materials

基　　金：广西信息材料重点实验室主任基金(桂科能0710908-15-Z);广西自然科学基金(2010GXNSFD013007)~~

摘　　要：通过固相法制备了(1–x)(0.9462K0.5Na0.5NbO3-0.0498LiSbO3-0.004BiFeO3)-xCo0.85Cu0.15Fe2O4((1–x)(KNN-LS-BFO)-xCCFO)(x=0.1、0.2、0.3、0.4、0.5)复合多铁性磁电陶瓷.XRD分析表明:烧结后的样品为复合的钙钛矿和尖晶石结构,没有发现杂相产生.SEM照片显示KNN-LS-BFO晶粒生长完好尺寸较大,而CCFO晶粒尺寸较小.当x从0.1增加到0.5时,复合材料的压电系数从120 pC/N减小到33 pC/N,而饱和磁化强度和剩磁增加,饱和磁致伸缩系数从18×10–6增加到51.5×10–6左右.材料的磁电耦合系数随着外磁场的增加先增大到极大值后再减小;当交变磁场频率为1 kHz,x=0.3时材料的磁电电压系数达到最大值20.6 mV/A.（1–x）（0.9462K0.5Na0.5NbO3-0.0498LiSbO3-0.004BiFeO3）-xCo0.85Cu0.15Fe2O4（（1–x）（KNN-LS-BFO）-xCCFO）（x=0.1,0.2,0.3,0.4,0.5） multiferroic magnetoelectric ceramics were prepared by solid phase method.The presence of perovskite and spinel in the sintered composites were proved by XRD patterns and no impurity phase existed. SEM images show that particle size of KNN-LS-BFO is big and complete,while the particle size of CCFO is small. When x increases from 0.1 to 0.5,the piezoelectric coefficient of the composites decreases from 120 pC/N to 33 pC/N,While saturation magnetization and remanent magnetization increase and saturation magnetostriction constant increases from 18×10–6 to 52×10–6 approximately.When the applied magnetic field increases,the magnetoelectric properties of the composites increase to the maximum and then decrease.When the alternating magnetic field frequency is 1 kHz and x=0.3,the magnetoelectric voltage coefficient attains maximum value 20.6 mV/A.

关 键 词：多铁性复合材料 磁电耦合效应 磁电电压系数 

分 类 号：TQ174[化学工程—陶瓷工业]