Pressure-induced crystallization of amorphous SiO2 with silicon-hydroxy group and the quick synthesis of coesite under lower temperature

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	Pressure-induced crystallization of amorphous SiO2 with silicon-hydroxy group and the quick synthesis of coesite under lower temperature
	G. Q. Zhang; Y. Xu; D. Xu; D. Y. Wang; Y. F. Xue; W. H. Su
	2008
发表期刊	High Pressure Research
ISSN	0895-7959
卷号	28 期号:4 页码:641-650
摘要	The crystallization of amorphous SiO2 powder with free water and silicon-hydroxy group (Si-OH) was investigated in the range of 0-4.2GPa and 150-1200C. The samples were detected by X-ray diffraction, transmission electron microscopy, thermogravimetry and differential thermal analysis, Raman and Fourier transform-infrared spectroscopy. The results show that amorphous SiO2 can transform to cristobalite at 1000C under room pressure. Under high pressure, amorphous SiO2 can quickly transform into single-phase coesite at lower temperature, and the P-T boundary of the crystallization products of mat1 (-quartz and coesite) has been successfully obtained. Through comparing the crystallization products from amorphous SiO2 materials with the same grain size containing different forms of water under high pressure and high temperature, it is found for the first time that the synthesis of coesite can be quickened by virtue of Si-OH in the amorphous SiO2 at lower temperature. The single-phase coesite has been synthesized from amorphous SiO2 with Si-OH under 4.2GPa and 190C for 30min, and 190C is the lowest synthesis temperature of coesite so far.
部门归属	[zhang, guangqiang; xu, dapeng; wang, deyong; xue, yanfeng; su, wenhui] jilin univ, coll phys, changchun 130023, peoples r china. [xu, yue] jilin univ, test sci expt ctr, changchun 130023, peoples r china. [su, wenhui] harbin inst technol, ctr condensed matter sci & technol, changchun, peoples r china. [su, wenhui] chinese acad sci, int ctr mat phys, shenyang, peoples r china.;xu, d (reprint author), jilin univ, coll phys, changchun 130023, peoples r china;xudp@jlu.edu.cn
关键词	Amorphous Sio2 -quartz Coesite High Pressure Silicon-hydroxy Group Quartz Phase Transitions Exhumation Spectra Rocks
URL	查看原文
WOS记录号	WOS:000261736600037
引用统计	被引频次：33[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/33312
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	G. Q. Zhang,Y. Xu,D. Xu,et al. Pressure-induced crystallization of amorphous SiO2 with silicon-hydroxy group and the quick synthesis of coesite under lower temperature[J]. High Pressure Research,2008,28(4):641-650.
APA	G. Q. Zhang,Y. Xu,D. Xu,D. Y. Wang,Y. F. Xue,&W. H. Su.(2008).Pressure-induced crystallization of amorphous SiO2 with silicon-hydroxy group and the quick synthesis of coesite under lower temperature.High Pressure Research,28(4),641-650.
MLA	G. Q. Zhang,et al."Pressure-induced crystallization of amorphous SiO2 with silicon-hydroxy group and the quick synthesis of coesite under lower temperature".High Pressure Research 28.4(2008):641-650.