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Gas Sensitive Mechanism of Ultrafine α-Fe_2O_3 Powder

Xu Jiaqiang (Dept.Chem.Eng.Zhengzhou Institute of Light Industry)Shen Yusheng (Dept.of Mater.Sci.and Eng.,University of Science and Technology of China)  
The adsorption quantity and state of oxygen on the surface of ultrafine α-Fe_2O_3powders at different temperatures were measured by XPS method.The conduc-tance- temperature curve of the powders was interpreted.According to the relation-ships between its gas sensitive effect and operating conditions:such as temperature,enviroment atmosphere and its oxygen adsorption activation energy,surface resista-nce controlled mode can be considered as the gas sensitive mechanism of ultrafinea-Fe_2O_3 powders.
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