Tb_(1-x)Dy_xFe_(2-y)-BaTi_(0.99)Mn_(0.01)O_(3+δ)层状复合材料的低频磁电耦合  

Low-frequency magnetoelectric coupling of Tb_(1-x)Dy_xFe_(2-y)-BaTi_(0.99)Mn_(0.01)O_(3+δ) layered composites

作　　者：曹鸿霞[1,2] 刘清惓[1,2] 王友保[1,2] 

机构地区：[1]南京信息工程大学,江苏省气象探测与信息处理重点实验室,南京210044 [2]南京信息工程大学电子与信息工程学院,南京210044

出　　处：《复合材料学报》2013年第6期146-152,共7页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(41075026;41275042;61072137);江苏高校优势学科建设工程资助项目

摘　　要：利用弹性力学模型,推导了低频下磁致伸缩-压电双层复合材料中磁电电压系数的表达式,计算了Tb1-x Dyx Fe2-y-BaTiO3层状复合材料中的横向磁电耦合。采用溶胶-凝胶法制备1.0%(摩尔分数)Mn掺杂BaTiO3(BaTi0.99Mn0.01O3+δ)压电陶瓷片。将Mn掺杂BaTiO3与Tb1-x Dyx Fe2-y胶合制成双层和三层复合材料,研究了复合材料在低频下的横向磁电效应。XRD和DSC分析结果表明,室温下Mn掺杂BaTiO3保持了其四方钙钛矿结构,降低了BaTiO3的居里点和相变潜热。在约33kA/m偏置磁场下,Tb1-x Dyx Fe2-y-BaTi0.99Mn0.01O3+δ和Tb1-x Dyx Fe2-y-BaTi0.99Mn0.01O3+δ-Tb1-x Dyx Fe2-y的横向磁电耦合峰值分别为529.4mV/A和1659.5mV/A,分别是Tb1-x Dyx Fe2-y-BaTiO3和Tb1-x Dyx Fe2-y-BaTiO3-Tb1-x Dyx Fe2-y的1.48和1.45倍。三层复合材料的横向磁电电压系数约是同类双层的3倍多。A elastic mechanics model was introduced to derive the magnetoelectric voltage coefficients of magnetostrictive-piezoelectric bilayer according to the constitutive equations. The transverse magnetoelectric coupling of Tb1-xDyxFe2-y-BaTiO3 layered composites were calculated by using the corresponding material parameters of individual phases. 1.0%（mole fraction） Mn doped BaTiO3 （BaTi0.99Mn0.01O3＋δ） was synthesized with sol-gel technique. Layered composites were fabricated by binding discs of rare earth alloy Tb1-xDyxFe2-y and Mn doped BaTiO3, and the transverse magnetoelectric was investigated. XRD and DSC analysis show that Mn doped BaTiO3 keeps the tetragonal structure at room temperature, and the phase transition temperature and the latent heat of ferroelectric to paraelectric are a little less than those of BaTiO3. The peak values of transverse magnetoelectric voltage coefficients for Tb1-xDyxFe2-y-BaTi0.99Mn0.01O3＋δ and Tb1-xDyxFe2-y-BaTi0.99Mn0.01O3＋δ-Tb1-xDyxFe2-y reach 529.4 mV/A and 1659.5 mV/A under a bias magnetic field of about 33 kA/m, which are 1.48 and 1.45 times of Tb1-xDyxFe2-y-BaTiO3 and Tb1-xDyxFe2-y-BaTiO3-Tb1-xDyxFe2-y, respectively. The transverse magnetoelectric voltage coefficient of trilayer composites is about three times as large as those for bilayers of the same kind.

关 键 词：磁电效应 层状复合物 掺杂BaTiO3 Tb1-x Dyx Fe2-y(TDF) 压电材料 

分 类 号：TB331[一般工业技术—材料科学与工程] TM201.3[电气工程—电工理论与新技术]