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采用化学共沉淀的方法合成了Sn~(4+),Ti~(4+),Zr~(4+)掺杂的。α-Fe_2O_3气敏陶瓷材料。用X射线衍射仪和透射电子显微镜分析了材料的微观结构及化学组成。用RQ-1型气敏元件特性测试仪测试了掺杂元素、掺杂量、工作温度,检测气体等对α-Fe_2O_3气体灵敏度和工作阻值的关系。结果表明:少量MO_2(M=Sn,Ti,Zr)的掺杂能显著提高α-Fe_2O_3的气体灵敏度,并且能够降低。α-Fe_2O_3气敏元件的工作电阻,有利于α-Fe_2O_3气敏材料的实用化。
Sn ~ (4 +), Ti ~ (4 +) and Zr ~ (4 +) were synthesized by chemical coprecipitation method. α-Fe_2O_3 gas-sensitive ceramic material. The microstructure and chemical composition of the material were analyzed by X-ray diffraction and transmission electron microscopy. The relationship between the sensitivity of α-Fe_2O_3 gas and the working resistance was tested by RQ-1 gas sensor’s characteristic tester, such as doping element, doping amount, working temperature and gas. The results show that the doping amount of MO 2 (M = Sn, Ti, Zr) can significantly increase the gas sensitivity of α-Fe 2 O 3 and decrease it. α-Fe 2 O 3 gas sensor working resistance, is conducive to the practical use of α-Fe 2 O 3 gas-sensitive materials.