二氧化硅掺杂钛酸锶钡陶瓷的介电性能与电卡效应  

Dielectric properties and electrocaloric effect of SiO2 doped Ba0.65Sr0.35TiO3 ceramics

作　　者：欧阳林虹 王文倩 王文伟 吴洁茹 薛昊[1] Ouyang Linhong;Wang Wenqian;Wang Wenwei;Wu Jieru;Xue Hao(College of Materials,Xiamen University 361005,China)

机构地区：[1]厦门大学材料学院

出　　处：《无机盐工业》2020年第3期39-44,共6页Inorganic Chemicals Industry

基　　金：福建省自然科学基金项目（2017J01098）

摘　　要：采用传统的固相反应法制备二氧化硅(SiO2)掺杂钛酸锶钡(Ba0.65Sr0.35TiO3,BST)陶瓷(BST+x%SiO2),研究了掺杂二氧化硅对BST陶瓷的物相、微观形貌、介电性能及电卡效应的影响。结果表明:掺杂二氧化硅并未改变BST陶瓷的晶型结构,但有助于提升晶粒的均匀性和材料介电性能频率的稳定性。随着二氧化硅掺杂量增加,BST陶瓷的介电常数呈现单调递减趋势,介电弥散特性逐渐增强。二氧化硅的掺杂有利于提升BST陶瓷的电卡性能,其中BST+3%SiO2陶瓷具有最优的电卡效应,在30℃下可获得最大电卡绝热温变(ΔTmax),ΔTmax和ΔTmax/ΔE分别为1.6℃、8.00×10^-7℃·m/V,电卡效应半峰宽(Tspan)为10℃左右。SiO2 doped barium strontium titanate(Ba0.65Sr0.35TiO3,BST)ceramics(BST+x%SiO2)were prepared by traditional solidstate reaction method.The effects of SiO2 doping on the phase,morphology,dielectric properties and electrocaloric effect of BST ceramics were studied.The results showed that doping SiO2 didn′t change the crystal structure of BST ceramics,but improved the uniformity of grain and the frequency stability of dielectric properties of BST ceramics.With the increase of SiO2 content,the dielectric constant decreased monotonously,the dielectric dispersion characteristics increased gradually.The doping of SiO2 was beneficial to improve the electrocaloric performance of BST ceramics.Among them,BST+3%SiO2 ceramic possessed the best electrocaloric effect,and the temperature of the maximum electrocaloric adiabatic temperature change(ΔTmax)was 30℃.ItsΔTmaxandΔTmax/ΔE were 1.6℃and 8.00×10^-7℃·m/V respectively,the half-width of the electrocaloric effect(Tspan)was about 10℃.

关 键 词：钛酸锶钡陶瓷 二氧化硅 介电性能 电卡效应 

分 类 号：TQ174.752[化学工程—陶瓷工业]