铌对(Y,Nb)掺杂的二氧化钛压敏-电容性能的影响

无机材料学报, 2001, 16(4): 723-728.

铌对(Y,Nb)掺杂的二氧化钛压敏-电容性能的影响

李长鹏 , 王矜奉 , 陈洪存 , 苏文斌

山东大学物理系, 济南 250100

Department of Physics

Shandong University

Jinan 250100

China

关键词：敏材料 , titania , electrical properties , frequency dependence

Nonlinear Electrical Properties of TiO₂·Y₂O₃·Nb₂O₅Capacitor-Varistor Ceramics

LI Chang-Peng , WANG Jin-Feng , CHEN Hong-Cun , SU Wen-Bin

Keywords： varistors , 二氧化钛 , 电学性能 , 频谱

研究了铌对（Ｙ，Ｎｂ）掺杂的二氧化钛压敏－电容性能的影响．研究中发现掺入０．１０ｍｏｌ％Ｎｂ_２Ｏ_５的样品显示出最低的视在电场（Ｅ_Ｂ＝８．８Ｖ／ｍｍ）、最高的非线性常数（α＝７．０）以及最高的相对介电常数（ε_ｒ＝７．６×１０４），与样品的晶界缺陷势垒特性、电容和电阻的频谱特性相一致．样品的性能变化可用Ｎｂ^５＋对Ｔｉ^４＋的掺杂取代和该取代存在的饱和值来解释．

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.

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