High permittivity of Ba(Ti_(1-x)Zr_(x))O_(3)-based Y5V-type nanopowders and ceramics synthesized using a one-step sol-gel method  

作　　者：Lulu Zhang Bin Cui Rong Ma Leilei Li Yan Wang Wenqing Yan Zhuguo Chang 

机构地区：[1]Key Laboratory of Synthetic and Natural Functional Molecule Chemistry(Ministry of Education)Shaanxi Key Laboratory of Physico-Inorganic Chemistry School of Chemistry&Materials Science,Northwest University 229 North Taibai Avenue,Xi’an 710069,P.R.China

出　　处：《Journal of Advanced Dielectrics》2013年第4期20-25,共6页先进电介质学报（英文）

基　　金：supported by the scientific research and projects program of the National Natural Science Foundation of China(No.21071115);by the Education Committee of Shaanxi province(No.09JC01).

摘　　要：We synthesized Ba(Ti_(1-x)Zr_(x))O_(3)-based(BTZ)nanopowders modified with Cu and Nb,and sintered ceramics using a one-step sol-gel process.Characterization using TG-DTG,XRD,SEM,and TEM analysis methods revealed that the powders formed at a nanometer scale.The process was controlled by the composition and calcining temperature.BaZrO3 formed earlier than BaTiO3 during the calcining,then a Ba(Ti_(1-x)Zr_(x))O_(3) solid solution formed incompletely,resulting in ceramics with huge permittivity and good temperature stability.Moreover,the maximum dielectric constant(εmax)first increased and then decreased as the Curie temperature(Tc)shifted to a lower temperature.When the Zr concentration was 5.4 mol%,εmax was greater than 24,000 and the dielectric loss(25℃)was only 0.005;this meets the Electronic Industries Alliance Y5V specifications.These nanopowders would permit a significant reduction in the thickness of multilayer ceramic capacitors and the huge pemittivity of the ceramics will help meet the current demand for device miniaturization in the electronics industry.

关 键 词：High permitivity sol-gel process Barium titanate dieletric properties Y5V-type 

分 类 号：TQ1[化学工程]