%0 Journal Article
%T Nonlinear Electrical Properties of TiO2<br>铌对(Y,Nb)掺杂的二氧化钛压敏-电容性能的影响
%A LI Chang-Peng
%A WANG Jin-Feng
%A CHEN Hong-Cun
%A SU Wen-Bin
%A <br>李长鹏
%A 王矜奉
%A 陈洪存
%A 苏文斌
%J 无机材料学报
%D 2001
%I Science Press
%X The nonlinear electrical properties of TiO2·Y2O3·Nb2O5 ceramics were investigated as a new varistor material. An optimal doping composition of 99.75%TiO2·0.60%Y2O3·0.10%Nb2O 5was obtained with low breakdown electrical field of 8.8V/mm, high nonlinear constant of 7.0 and ultrahigh relative dielectric constant of 7.6×104, being consistent with the highest and narrowest grain boundary barriers of the ceramic. The frequency dependence of the capacitance and the resistivity shows that the samples doped with 0.10%mol Nb2O5 exhibit the highest capacitance and resistivity at low frequencies and comparatively low in comparison with other samples at high frequencies. In view of these electrical characteristics; the ceramic of 99.75%TiO2·0.60%Y2O3·0.10%Nb2O5 is a viable candidate for capacitor-varistor functional devices. The characteristics of the ceramics can be explained by the effect and the maximum of the substitution of Ti4+ with Nb5+. In order to illustrate the grain boundary barriers formation in TiO2·Y2O3·Nb2O5 varistors, a grain-boundary defect barrier model was also introduced.
%K varistors
%K titania
%K electrical properties
%K frequency dependence<br>压敏材料
%K 二氧化钛
%K 电学性能
%K 频谱
%K 压敏性能
%K 陶瓷
%K 铌
%K 掺杂
%K 电容性能
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=84529CA2B2E519AC&jid=ABC0063016AF57E1C73EF43C8D2212BD&aid=88F63DFDB024863E&yid=14E7EF987E4155E6&vid=7801E6FC5AE9020C&iid=E158A972A605785F&sid=19402779123D7C0E&eid=4D1A534FF6CD5D9A&journal_id=1000-324X&journal_name=无机材料学报&referenced_num=7&reference_num=14