CRYSTAL-STRUCTURE OF HILLEBRANDITE - A NATURAL ANALOG OF CALCIUM SILICATE HYDRATE (CSH) PHASES IN PORTLAND-CEMENT

被引:0
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作者
DAI, YS [1 ]
POST, JE [1 ]
机构
[1] SMITHSONIAN INST,DEPT MINERAL SCI,WASHINGTON,DC 20560
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中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The crystal structure of hillebrandite, Ca2SiO3(OH)(2), was solved and refined in space group Cmc2(1), a = 3.6389, b = 16.311, c = 11.829 Angstrom, to R = 0.041 using single-crystal X-ray data. The structure consists of a three-dimensional network of Ca-O polyhedra that accommodates wollastonite-type Si-O tetrahedral chains. Each of the wollastonite-type chains is an average of two symmetrically equivalent chains related by the mirror plane perpendicular to a. In a given structural channel of the Ca-O polyhedral network, only one chain orientation can be occupied to give reasonable Si-O distances. The O3 and O4 sites corresponding to each vacant Si2 site are occupied by OH groups to achieve charge balance. The wollastonite-type Si-O tetrahedral chains in the hillebrandite structure resemble those reported for many calcium silicate hydrate (CSH) phases.
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页码:841 / 844
页数:4
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