过渡族元素掺杂BaTiO3-Tb1-xDyxFe2-y层状复合材料中的磁电效应

用溶胶-凝胶法制备1.0%mol Mn，Cr，Co掺杂 BaTiO₃(BTO)粉体，在1350℃下烧结成多晶陶瓷样品.X射线衍射和差示扫描量热分析表明，室温下掺杂BaTiO₃具有四方钙钛矿结构；居里点和相变潜热随Cr，Mn，Co掺杂逐渐降低.将掺杂BaTiO₃与Tb_1-xDy_xFe_2-y(TDF)胶合制成双层磁电复合材料，并研究了Cr:BTO-TDF，Mn∶BTO-TDF，Co:BTO-TDF层状复合材料中的磁电效应.实验表明，在340×80 A·m^-1偏置磁场下， Cr:BTO-TDF的横向磁电电压系数达到最大值586 mV·cm^-1·(80 A·m^-1)^-1.在400×80 A·m^-1偏置磁场下，Mn∶BTO-TDF和Co:BTO-TDF的横向磁电电压系数的最大值分别为480 mV·cm^-1·(80 A·m^-1)^-1和445mV·cm^-1·(80 A·m^-1)^-1.研究表明掺杂BaTiO₃-TDF层状复合材料中具有较强的磁电耦合.作为无铅压电材料，掺杂BaTiO₃制备的磁电效应器件颇具应用前景. 关键词： 磁电效应 双层复合材料 3')" href="#">掺杂BaTiO₃ 1-xDy_xFe_2-y')" href="#">Tb_1-xDy_xFe_2-y

Magnetoelectric effect in transition-metal-doped BaTiO3-Tb1-xDyxFe2-y bilayer

1.0 mol% Mn(Cr,Co)-doped BaTiO₃ have been synthesized with sol-gel technique. The doped BaTiO₃ were found to have tetragonal structure at room temperature. The phase transition temperatures and the latent heat of ferroelectric to paraelectric transition were observed to decrease with Cr, Mn and Co doping in BaTiO₃. Magnetic characterizations including magnetostriction and magnetization were performed for Tb_1-xDy_xFe_2-y(TDF). Bonded bilayer composites Cr∶BTO-TDF, Mn∶BTO-TDF and Co:BTO-TDF have been fabricated and the transverse ME effect of the three bilayers have been investigated. The maximum transverse ME voltage coefficients for Cr∶BTO-TDF bilayer can reach 586mV·cm^-1·(80　A·m^-1)^-1 under a bias magnetic field of 340×80 A·m^-1, and that for Mn∶BTO-TDF and Co:BTO-TDF are 480 mV·cm^-1·(80 A·m^-1)^-1 and 445 mV·cm^-1·(80 A·m^-1)^-1 under a bias magnetic field of about 400×80　A·m^-1, respectively.