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Crystal Structure of Centrosymmetric 12-Layer Sodium-Rich Eudialyte

机译:中心对称的12层富钠Eudialyte的晶体结构

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摘要

The structure of a new representative of the eudialyte group with the formula (Na,Sr,K)_(18)Ca_6Zr_3Fe[Si_(25)O_(72)](OH)_2Cl H_2O from the Lovozero massif (Kola Peninsula) was studied by X-ray diffraction. The trigonal unit-cell parameters are a = 14.226 _, c = 30.339 _, sp. gr. R3m ; the R factor is 0.045 based on 990 reflections. This sample is of interest as a sodium-rich and iron-poor mineral having a rare cen_trosymmetric structure, in which the M(2) site is occupied predominantly by sodium atoms. The dependence of the formation of centrosymmetric and non-centrosymmetric structures on the composition of eudialyte-group minerals was analyzed.
机译:研究了来自Lovozero地块(可乐半岛)的具有式(Na,Sr,K)_(18)Ca_6Zr_3Fe [Si_(25)O_(72)](OH)_2Cl H_2O的新的常态电解质基团的结构通过X射线衍射。三角形晶胞参数为a = 14.226 _,c = 30.339 _,sp。 gr。 R3m;基于990个反射,R因子为0.045。该样品作为具有稀少的中心对称结构的富钠和贫铁矿物质而受到关注,其中M(2)位点主要被钠原子占据。分析了中心对称结构和非中心对称结构的形成对常绿岩矿物质组成的依赖性。

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