MgO改性PbCrO_4基湿敏电阻机理研究  

Mechanism on MgO-modified PbCrO_4 series humidity-sensing resistors

作　　者：黎步银[1] 周东祥[1] 龚树萍[1] 吕文中[1] 

机构地区：[1]华中科技大学电子科学与技术系,湖北武汉430074

出　　处：《功能材料》2001年第6期647-648,共2页Journal of Functional Materials

摘　　要：对MgO改性的PbCrO4 基湿敏电阻进行了研究。随着MgO含量的增加使得该系列湿敏电阻在低、中湿范围内感湿灵敏度增大 ,当MgO含量超过 0 .5mol时 ,在全湿度范围内 ,湿阻特性曲线接近直线。结合X ray衍射分析及扫描电镜分析 ,探讨了MgO改性的PbCrO4MgO modified PbCrO 4 series humidity sensing resistors were investigated. Experiments indicate that the change of crystal structure from PbCrO 4 to Pb 2CrO 5 occurs with the increasing amounts of MgO so that the sensitivity was improved because Pb 2CrO 5 is more moisture retentive than PbCrO 4, and at the same time, the grain size also decreases, therefore, the capillary action increases with the increasing amounts of MgO, and the humidity sensibility of the sample doped with more amount of MgO is bigger than that of the sample doped with less amount of MgO in the middle and lower relative humidity concentration due to the formation of more humidity sensing elements Mg OH.

关 键 词：铬酸铅 湿敏电阻 碱士金属 湿度传感器 氧化镍改性 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TN304.82[自动化与计算机技术—控制科学与工程]