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Crystal structure of holtite I

机译:锂铁矿I的晶体结构

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The crystal structure of As-containing holtite I is refined (Ital Structures diffractometer, 939 crystallographically independent reflections, anisotropic a proximation, R = 0.047). The parameters of the orthorphombic unit cell are a = 4.695(1) Angstrom, b = 11.906(3) Angstrom, c = 20.38(3) Angstrom, sp. gr. Pnma, Z = 4. On the whole, the structural formula obtained, (Si2.43Sb0.36As0.21)BO3[(Al(0.62)Ta(0.26)square)Al-2(Al(0.98)square)(2)(Al(0.94)square)(2)O-12](O,OH,square)(2.65), corresponds to the electron-probe analysis data. The statistical replacement of (Si,AS)04 tetrahedra by pyramidal [SbO3] groups is confirmed. The X-ray diffraction spectra of holtite I are compared with those of holtite II. (C) 2005 Pleiades Publishing, Inc.
机译:改进了含As的辉石I的晶体结构(Ital Structures衍射仪,939个晶体学独立反射,各向异性近似,R = 0.047)。正交晶胞的参数为a = 4.695(1)埃,b = 11.906(3)埃,c = 20.38(3)埃,sp。 gr。 Pnma,Z =4。总体而言,获得的结构式为(Si2.43Sb0.36As0.21)BO3 [(Al(0.62)Ta(0.26)square)Al-2(Al(0.98)square)(2) (Al(0.94)square)(2)O-12](O,OH,square)(2.65),对应于电子探针分析数据。证实了统计上(Si,AS)04四面体被金字塔形[SbO3]取代。比较了白云母I与X白云母II的X射线衍射光谱。 (C)2005年Pleiades Publishing,Inc.

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