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- W2172023502 abstract "Eine röntgenographische Untersuchung an Einkristallen von Na3ScF6 bestätigte die monokline Kryolithstruktur dieser Verbindung: a = 559,5, b = 580,2, c = 811,6 pm, β = 90,72°, Z = 2, Raumgruppe P21/n; R1 = 0,021 für 512 symmetrie-unabhängige Reflexe. Die [ScF6]-Oktaeder (Mittelwert ScF = 200,7 pm) sind ebenso wie die mit ihnen verknüpften [NaF6]-Oktaeder (Na1F = 229,1 pm) um etwa 20° gegen die Richtungen der perowskitartigen Pseudozelle gekippt. Diese Oktaederkippung wird im Vergleich mit anderen Kryolithen und mit den orthorhombischen Perowskiten NaMF3 diskutiert; dabei ergibt sich ein Zusammenhang zwischen Kippungswinkel und Toleranzfaktor t < 0,88 für diese Verbindungen, in deren [NaF8]-Koordination sich einheitlich ein konstanter Mittelwert von Na2F = 231,5 ± 1 pm für die vier kürzesten Abstände zeigt. The Cryolite Structure of Na3ScF6 and the Tilting of Octahedra in Isostructural Sodium Hexafluorometallates Na3MF6 X-ray studies at single crystals of Na3ScF6 confirmed the monoclinic cryolite type structure of this compound: a = 559.5, b = 580.2, c = 811.6 pm, β = 90.72°, Z = 2, space group P21/n; R1 = 0.021 for 512 symmetry independent reflections. The octahedra of [ScF6] (average ScF = 200.7 pm), as well as those of [NaF6] (Na1F = 229.1 pm) linked to them, are titled by about 20° with respect to the axes of the perovskite-like pseudocell. This tilting of octahedra is discussed in comparison with other cryolites and with orthorhombic perovskites NaMF3; there results a correlation between tilt angle and tolerance factor t ˜ 0.88 of these compounds, the [NaF8] coordination of which invariably exhibits a constant mean value of Na2F = 231.5 ± 1 pm for the four shortest distances." @default.
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- W2172023502 date "1994-10-01" @default.
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- W2172023502 title "Die Kryolithstruktur von Na3ScF6 und die Oktaederkippung in isostrukturellen Natriumhexafluorometallaten Na3MF6" @default.
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