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采用溶胶 凝胶工艺在α Fe2 O3 K2 O复合体系中掺入SiO2 .XRD、BET比表面吸附、Archimede排水法等对α Fe2 O3 K2 O SiO2 陶瓷表征结果表明 ,适量掺杂SiO2 ,材料仍以刚玉结构的α Fe2 O3为主晶相 ,但抑制了主晶相晶粒粗化 ,增大了材料比表面积及孔隙率 .湿敏性能测试发现 ,掺杂摩尔分数 6%的SiO2 ,可获得全湿区范围内阻—湿特性曲线线性关系良好、灵敏度适中、湿滞小、稳定性较高的新型湿敏材料 .其中 ,K+被吸收分散在主晶相晶界硅玻璃相中是改善材料湿滞效应及性能稳定性的主要原因 .
The results of XRD, BET specific surface adsorption, Archimede drainage and so on indicate that the proper amount of SiO2 is doped, the material is still corundum Structure of α Fe2 O3 as the main crystalline phase, but inhibited the primary crystal grain coarsening, increasing the specific surface area and porosity of the material.Humidity sensitivity test found that doping mole fraction of 6% SiO2, can be fully wet In the region, a new type of humidity-sensitive material with good linearity, moderate sensitivity, low humidity hysteresis and high stability was found in the range of resistance-humidity characteristic curve, of which, K + was absorbed and dispersed in the main crystalline phase boundary silicon glass phase, Effect and stability of the main reasons.