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《Acta Armamentarii》 2007-02
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A Study on the Crystallization Behavior of ZnO-Al_2O_3-SiO_2 Transparent Glass-Ceramics

HOU Zhao-xia1,2,SU Chun-hui2,3,ZHANG Hua-shan2,ZHANG Hong-bo2(1.School of Chemical and Material Engineering,Jilin Institute of Chemical Technology,Jilin 132022,Jilin,China;2.School of Chemical and Environmental Engineering,Changchun University of Science and Technology,Changchun 130022,Jilin,China;3.Jilin Teacher's Institute of Engineering and Technology,Changchun 130000,Jilin,China)  
Li2O-ZnO-Al2O3-SiO2 glass was melted in a platinum crucible at 1 600 ℃ for 2 h,and then a two-step heat treatment for the nucleation and crystal growth was used to prepare transparent glass-ceramics.The characterizations were performed by differential thermal analysis,X-ray diffraction,Fourier transmission infrared spectroscopy,scanning electron microscopy and UV-Vis-NIR scanning spectrophotometer.Only one crystal phase namely cubic gahnite ZnAl2O4 exists when heat-treated below 970 ℃,and tetrahedral β-quartz phase begins to precipitate at 970 ℃ and becomes the main crystal phase at 1 100 ℃,at the same time,gahnite ZnAl2O4 becomes the minor crystal phase.The grain size distributes normally,and the standard deviation increases with the heat treatment temperature increasing.The lattice parameter of cubic gahnite calculated by the XRD data is 0.809 3 nm(±0.000 7),which is very close to that of the standard sample.
【Fund】: 教育部优秀青年教师资助项目(KB20026)
【CateGory Index】: TQ174.1
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