Structural defects in microcrystalline silica
Structural defects in microcrystalline silica
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DOI：
10.1007/bf00307990
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发表时间：
1987-03
影响因子：
1.4
通讯作者：
H. Graetsch;O. W. Flörke;G. Miehe
中科院分区：
文献类型：
--
作者：
H. Graetsch;O. W. Flörke;G. Miehe
用X射线粉末衍射法和透射电子显微镜（TEM）对微晶硅石的结构进行了表征，包括玉髓、燧石、莫干石、蛋白石-C和-CT。通过红外光谱和化学分析研究了杂质的作用，发现微晶蛋白石、玉髓和燧石具有无序的共生结构，其中蛋白石中有方石英和鳞石英畴，玉髓和燧石中有石英和黑云母畴。每个组成相具有不同的晶胞尺寸和对称性。主要杂质是水，其在共生界面处富集。微晶二氧化硅的密度和折射率取决于水含量。
The structure of the microcrystalline silica varieties chalcedony, flint, moganite, opal-C and -CT is characterized by X-ray powder diffractometry andtransmission electron microscopy(TEM). The role of impurities is investigated by infrared spectroscopy and chemical analysis.Microcrystalline opal, chalcedony and flint have a disordered intergrowth structure composed of cristobalite and tridymite domains in opal, and quartz and moganite domains in chalcedony and flint. Each constituent phase has different cell dimensions and symmetry. The main impurity is water which is enriched at the intergrowth interfaces. Density and refractive indices of microcrystalline silica depend on the water content.