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- W158636842 abstract "Abstract The crystal structure of a new monoclinic Ca 2 NaSiO 4 F polymorph was determined by single crystal X-ray diffraction methods. It crystallises in space group P 2 1 / c , unit cell parameters are a = 13.5385(8), b = 7.1338(4), c = 10.6689(6) Å and β = 113.231(4)°, with Z = 8. The crystals show twinning by pseudo merohedry. Monoclinic dicalcium sodium fluoride silicate is a superstructure of a previously known orthorhombic compound of the same composition. A re-investigation of the orthorhombic Ca 2 NaSiO 4 F revealed weak diffuse X-ray scattering, which shows a relation to the monoclinic superstructure. Furthermore, both compounds exhibit additional twinning by partial merohedry interrelated with a hexagonal pseudo symmetry. The sixfold pseudo symmetry originates from chains of face-sharing anion-centred coordination polyhedra of fluorine atoms, which are octahedrally coordinated by mixed Ca/Na sites. Main deviations from hexagonal symmetry are caused by the arrangement of the isolated silicate tetrahedra." @default.
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- W158636842 date "2008-06-01" @default.
- W158636842 modified "2023-09-27" @default.
- W158636842 title "Ca2NaSiO4F: a new monoclinic polymorph" @default.
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- W158636842 doi "https://doi.org/10.1524/zkri.2008.0038" @default.
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