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首页> 外文期刊>Crystallography reports >Crystal-structure refinement of zirconium-rich eudialyte and its place among calcium-poor eudialyte-group minerals
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Crystal-structure refinement of zirconium-rich eudialyte and its place among calcium-poor eudialyte-group minerals

机译：富锆共溶物的晶体结构细化及其在贫钙共渗物类矿物中的位置

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The repeated refinement of the crystal structure of zirconium-rich eudialyte based on the X-ray diffraction data set collected earlier revealed new structural features. The trigonal unit-cell parameters are a = 14.222(3) ?, c = 30.165(5) ?, V = 5283.9 ?~3. The refinement resulted in the reduction of the R factor from 0.045 (2347F > 4σ(F)) to 0.035 (3124F > 3σ(F)). It was found that the ordering of Ca and Fe in six-membered rings leads to the lowering of the symmetry to R3. An excess amount of zirconium (more than three atoms per symmetrically independent unit) is located in the M2 microregion in square and five-vertex polyhedral positions. However, this amount is insufficient to be dominant, and the deficiency of zirconium is compensated for by sodium atoms. Based on the new data, zirconium-rich eudialyte can be assigned to the oneillite subtype, being a zirconium-rich and aluminum variety of raslakite.
机译：基于较早收集的X射线衍射数据集，对富锆的共沸物的晶体结构的反复细化揭示了新的结构特征。三角晶胞参数是a ＝ 14.222（3）Ω，c ＝ 30.165（5）Ω，V ＝5283.9Ω〜3。细化导致R因子从0.045（2347F>4σ（F））降低到0.035（3124F>3σ（F））。发现六元环中Ca和Fe的有序性导致R 3的对称性降低。过量的锆（每个对称独立单元超过三个原子）位于M2微型区域的正方形和五顶点多面体位置。但是，该量不足以占主导地位，并且锆的缺乏可通过钠原子来补偿。根据新数据，可以将富含锆的共渗物归为一种硅藻土亚种，一种富含锆和铝的拉拉克石。

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