摘要
研究了Ｃｏ２Ｏ３掺杂剂及工艺条件等对低压ＷＯ３基压敏电阻性能的影响。在保持ＭｎＯ２及Ｎａ２ＣＯ３含量不变的前提下，我们发现，对于ＷＯ３－ＭｎＯ２－Ｎａ２ＣＯ３系列，掺入Ａｌ２Ｏ３可以明显改善其电学稳定性，但同时也失去了非线性，而Ｃｏ２Ｏ３的掺入可以明显提高非线性，以１％（摩尔分数）的Ｃｏ２Ｏ３含量为最好，其α值约为５．５（从Ｕ１ｍＡ到Ｕ０．１ｍＡ），击穿场强小于１０Ｖ／ｍｍ。最高烧结温度应不低于１１００℃～１１５０℃，低于１０５０℃时会破坏非线性。简单的数值估算及已有的实验结果表明，需要建立一个有别于ＺｎＯ的非线性传导模型以解释ＷＯ３的非线性现象。
Effects of additives and fabrication conditions on low voltage WO3-based varistor have been studied in present paper.For the system of WO3-MnO2-Na2CO3,it is found that,when the amounts of MnO2 and Na2CO3 are unchanged,Al2O3 can greatly improve the stability of sample,but at the same time sample become ohmic resister.However,doping of 1mol% Co2O3 can obviously improve the nonlinearity with nonlinear coefficient about 5.5 (from U 1mA to U 0.1mA) and breakdown field below 10V/mm.The maximum sintering temperature is between 11001150,and nonlinearity will vanish below 1050.Simple theoretical calculation and present experimental results indicate that a new nonlinear transport model different from these models for zinc oxide varistor should be established for WO3-based varistor.
出处
《功能材料》
EI
CAS
CSCD
北大核心
1999年第3期299-301,共3页
Journal of Functional Materials
基金
湖北省自然科学基金
关键词
钨氧化物
压敏电阻
掺杂
制备条件
tungsten oxide
varistor
doping
fabricating conditions
