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《CHINESE JOURNAL OF MATERIAL RESEARCH》 1999-05
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STRUCTURAL PHASE TRANSITION AND THERMAL STABILITY OF BROOKITE BASED NANOCRYSTALLINE TiO_2

YE Xisheng 1** JIAO Zhengkuan 2 ZHANG Lide 3 SHA Jian 2 LIN Dongsheng 1 ( 1. Northwest Institute of Nuclear Technology, Xi'an 710024 2. Zhejiang University 3. Institute of Solid State Physics, The Chinese Academy of Scienc  
The thermal stability of brookite based nanocrystalline TiO 2 with a certain amount of anatase and rutile has been studied. From TG DTA (differential thermoanalytical analysis) experiment, it was found that there exist two endothermic peaks on the DTA curve of the specimen. From XRD measurement, grain sizes and phase contents of the original and heat treated specimens, it was confirmed that, the first peak in the temperature range of 30~160℃ corresponds to the desorption of physical or chemical absorption, the second one in the temperature range of 780~845℃ is related to the rapid first order phase transitions from brookite to anatase then to rutile. Before occurrence of the second peak appears, there exists slow transition from brookite to anatase. The transitions are beneficial to the grain growth.
【Fund】: 国家自然科学基金;西北核技术研究所科学基金
【CateGory Index】: TB383
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