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采用硬脂酸凝胶法这种化学新工艺制备了α Fe2 O3 TiO2 K2 O复合氧化物纳米湿敏陶瓷元件 ;研究了该元件在不同湿度下的复阻抗谱 ,并建立相应的模拟等效电路 ;材料晶粒电阻、晶界电阻等特征参数计算结果表明 ,晶粒电阻基本不随湿度变化 ,晶界电阻随湿度升高而降低 .从晶界电阻角度探讨了本系材料的湿敏导电机制 ,低湿阶段导电载流子为电子和自由H+,自由H+以氢桥键过渡态机制迁移 ,中、高湿阶段导电载流子以H3O+为主 .
The α-Fe2 O3 TiO2 K2 O composite oxide nano-humidity-sensitive ceramic element was prepared by a new stearic acid gel method. The complex impedance spectroscopy of the element at different humidity was studied and the corresponding analog equivalent circuit The calculation results of the characteristic parameters of the grain resistance and the grain boundary resistance show that the grain resistance does not change with the humidity basically and the grain boundary resistance decreases with the increase of the humidity.The mechanism of humidity- In the low-humidity stage, the conductive carriers are electrons and free H +, and free H + migrates through the hydrogen-bridge transition state mechanism. In the middle and high humidity stages, the conductive carriers are dominated by H3O +.