Tb_(1-x)Dy_xFe_(2-y)-Fe掺杂BaTiO_3多层膜中的磁电耦合

Magnetoelectric cuopling in laminate composites Tb_(1-x) Dy_xFe_(2-y) and Fe-doped BaTiO_3

用溶胶-凝胶法制备了Fe掺杂BaTiO3粉体,在1350℃下烧结成圆片状多晶样品,并与Tb1-xDyxFe2-y胶合成磁电(ME)双层膜或三层膜.实验分析表明Fe:BaTiO3依然是四方相钙钛矿结构,但是居里温度及相变潜热均略低于纯净BaTiO3.研究了Tb1-xDyxFe2-y-Fe∶BaTiO3双层膜和Tb1-xDyxFe2-y-Fe∶BaTiO3-Tb1-xDyxFe2-y三层膜的ME效应.在2.8×104A/m的磁场下,两者的横向ME电压系数均达其峰值,分别为6.225和26.25mV·(A·m-1)-1·cm-1.并且,用掺杂BaTiO3制备的双层膜和三层膜的横向ME电压系数均为相同条件下用纯净BaTiO3制备的双层膜和三层膜的横向ME电压系数的1.5倍.另外由于不含铅,锆等有害物质,符合环保要求,因此采用掺杂BaTiO3制备的磁电效应器件具有深入研究和应用价值.

Fe-doped BaTiO3 has been synthesized with sol-gel technique. The doped perovskite was found to have tetragonal structure. The transformation point of ferroelectric to paraelectric and the latent heat of the transformation were observed to be a little less than those for pure BaTiO3. Layered composites Tb1-x Dyx Fe2- y/Fe： BaTiO3 have been fabricated. Their mgnetoelectric （ME） effect has been investigated. The transverse ME voltage coefficient for the bilayer Tb1-xDyx Fe2-y-Fe ： BaTiO3 and the trilayer Tb1-x Dyx Fe2-y-Fe： BaTiO3-Tb1-x Dyx Fe2-y can reach 6. 225 adn 26.25 mV·（A· m^-1 ）^-1· cm^- 1 , respectively, under a bias magnetic field of 2.8 × 10^4 A/m at room temperature, which are about 50 % larger than those for the bilayer and trilayer composed of pure BaTiO3 .