CRYSTAL STRUCTURE OF HYDROZINCITE ZN5(OH)6)CO3)2
CRYSTAL STRUCTURE OF HYDROZINCITE ZN5(OH)6)CO3)2
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DOI：
10.1107/s0365110x64002651
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发表时间：
1964-01-01
期刊：
影响因子：
--
通讯作者：
GHOSE, S
中科院分区：
文献类型：
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作者：
GHOSE, S
水锌矿（Zns（OH）e（COs））为单斜晶系，a0= 13.62，b 0 = 6-30，co= 5.42，fl= 95 50 '，空间群C2/m，每个晶胞有两个化学式单元。结构由Patterson投影确定，并用部分三维强度数据用最小二乘法修正。该结构由八面体和四面体配位的锌组成，比例为3：2。八面体锌原子形成C6型片层的一部分，其具有孔，分布在矩形6.3× 5-4 A网上。四面体配位的锌原子出现在这些空穴的上方和下方。平行于（100）的复合片通过垂直于片发生的COa基团保持在一起。CO 3基团的两个氧原子分别与八面体和四面体锌原子键合，而第三个氧原子与三个OH基团氢键合。平均四面体Zn-O距离为1.95 ~ k，明显小于平均八面体Zn-O距离2.10~ k。OH：CO 3比率在天然和合成样品中是可变的，缺乏CO 3的相是高度堆叠无序的。根据这种结构，这些现象是可以理解的，因为缺失碳酸盐基团将促进层序中的错误。
Hydrozincite, Zns (OH) e (COs), is monoclinic with a0= 13.62, b0= 6-30, co= 5.42 A, fl= 95 50', space group C2/m, two formula units per cell. The structure has been determined from Patterson projec-tions and refined by the least-squares method with partial three-dimensional intensity data. The structure is composed of zinc in both octahedral and tetrahedral coordination, in the ratio 3: 2. The octahedral zinc atoms form part of a C6 type sheet with holes, which are distributed on a rectangular 6.3× 5-4 A net. Zinc atoms in tetrahedral coordination occur above and below these holes. The complex sheets parallel to (100) are held together by COa groups, occurring normal to the sheets. Two oxygen atoms of the COs group are bonded to an octahedral and a tetrahedral zinc atom each, while the third oxygen atom is hydrogen bonded to three OH groups. The average tetrahedral Zn-O distance, 1.95/~, is significantly smaller than the average octahedral Zn-O distance, 2.10~ k. The OH: COa ratio is variable in natural and synthetic samples, the C03-deficient phases being highly stacking-disordered. On the basis of this structure these phenomena are understandable, since missing carbonate groups will facilitate mistakes in the layer sequence.