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- W2358754399 abstract "In the course of a series of KF-flux synthesis experiments aiming at the preparation of new compounds in the ternary system K 2 O–CaO–SiO 2 , of interest to e.g . the glass and fertiliser industries and to recycling of ashes of biomass combustion, a novel potassium-calcium silicate-fluoride was obtained whose composition was determined as K 7 Ca 9 [Si 2 O 7 ] 4 F using electron-microprobe analysis. Polycrystalline material of the same compound could be also prepared by solid-state reactions. Applying direct methods it was possible to solve the crystal structure of this compound from single-crystal diffraction data. Structure solution was complicated due to complex pseudo-merohedral twinning. K 7 Ca 9 [Si 2 O 7 ] 4 F crystallises in the monoclinic space group P 2 1 / m , with a = 5.6122(2) A, b = 13.8143(5) A, c = 9.8016(4) A, β = 90.255(4)°, V = 759.90(5) A 3 , Z = 1. Additional characterisation has been performed by Raman spectroscopy. The compound belongs to the group of sorosilicates and is built up from Si 2 O 7 groups. Potassium and calcium cations are distributed among five crystallographically independent cation positions, which are coordinated in form of distorted octahedra, trigonal prisms or more irregular polyhedra. By sharing common faces, octahedra and trigonal prisms form infinite columns running parallel to [010]. These columns are connected to the Si 2 O 7 groups through common corners. Additional fluorine positions are located in voids between the Si 2 O 7 groups and the columns. A detailed comparison with structurally related compounds is given, including a group-theoretical discussion of the symmetry relationships." @default.
- W2358754399 created "2016-06-24" @default.
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- W2358754399 date "2016-11-29" @default.
- W2358754399 modified "2023-09-27" @default.
- W2358754399 title "Crystal structure, Raman spectroscopy and crystal chemistry of K7Ca9[Si2O7]4F, a new potassium-calcium silicate-fluoride" @default.
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- W2358754399 doi "https://doi.org/10.1127/ejm/2016/0028-2539" @default.
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