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  • 1
    Electronic Resource
    Electronic Resource
    Die Kryolithstruktur von Na3ScF6 und die Oktaederkippung in isostrukturellen Natriumhexafluorometallaten Na3MF6 (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1686-1691 
    Details
    ISSN: 0044-2313
    Keywords: Sodium scandium fluoride ; cryolite structure ; tolerance factor ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Cryolite Structure of Na3ScF6 and the Tilting of Octahedra in Isostructural Sodium Hexafluorometallates Na3MF6X-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 Sc—F = 200.7 pm), as well as those of [NaF6] (Na1—F = 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 Na2—F = 231.5 ± 1 pm for the four shortest distances.
    Notes: 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 Sc—F = 200,7 pm) sind ebenso wie die mit ihnen verknüpften [NaF6]-Oktaeder (Na1—F = 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 Na2—F = 231,5 ± 1 pm für die vier kürzesten Abstände zeigt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946201004
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  • 2
    Electronic Resource
    Electronic Resource
    Die Kristallstrukturen der Weberite Na2CuScF7 und Na2ZnAlF7 (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1692-1697 
    Details
    ISSN: 0044-2313
    Keywords: Sodium copper scandium fluoride ; sodium zinc aluminium fluoride ; weberite structure ; crystal structure determination ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Crystal Structures of the Weberites Na2CuScF7 and Na2ZnAlF7At single crystals of the orthorhombic weberites Na2CuScF7 (Pmnb, Z = 4) and Na2ZnAlF7 (Imma, Z = 4) X-ray structure determinations were performed. Na2CuScF7 (Na2ZnAlF7): a = 726.0 (709.2), b = 1053.4 (1009.2), c = 765.8 (733.7) pm; R1 = 0.030 (0.042) for 887 (363) observed and independent reflections. The resulting average distances of the octahedrally coordinated metal atoms are: Cu—F = 200.7 pm, Sc—F = 201.7 pm; Zn—F = 198.8 pm, Al—F = 180.1 pm. Some structural relations and the variation in the bridge angles of the corner-sharing octahedra are discussed.
    Notes: An Einkristallen der orthorhombischen Weberite Na2CuScF7 (Pmnb, Z = 4) und Na2ZnAlF7 (Imma, Z = 4) wurden röntgenographische Strukturbestimmungen durchgeführt. Na2CuScF7 (Na2ZnAlF7): a = 726,0 (709,2), b = 1053,4 (1009,2), c = 765,8 (733,7) pm; R1 = 0,030 (0,042) für 887 (363) beobachtete und unabhängige Reflexe. Die resultierenden mittleren Abstände für die oktaedrisch koordinierten Metallatome sind: Cu—F = 200,7 pm, Sc—F = 201,7 pm; Zn—F = 198,8 pm, Al—F = 180,1 pm. Die Stukturverhältnisse und die Unterschiede in den Brückenwinkeln der eckenverknüpften Oktaeder werden diskutiert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946201005
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  • 3
    Electronic Resource
    Electronic Resource
    Röntgenographische Untersuchungen an Titan(III)-Fluorverbindungen mit pyrochloverwandten Strukturen (1980)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 467 (1980), S. 187-196 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: X-Ray Studies on Titanium(III) Fluoro Compounds with Pyrochlore-related StructuresThe cubic compounds (a/pm) CsMIITiIIIF6, MII = Mg (1041.6), Ni (1043.9), Zn (1049.8), Co (1051.7), V (1052.6), Fe (1055.3), Mn (1064.9) and CsM0,5ITi1,5IIIF6, MI = K (1074.6), Rb (1080.6) were prepared. They crystallize in the modified pyrochlore structure of the RbNiCrF6 type, which is confirmed once more at single crystals of an oxide fluoride phase CsTi2X6 (X6 between O2F4 and O3F3): Space group Fd3m, a = 1028.8 pm, R = 2.6% (126 independent reflections). Further compounds CsM0,5ITi1,5IIIF6 according to their powder diagrams are orthorhombic (MI = NH4: a = 764.1, b = 767.5, c = 1087.5 pm) or monoclinic (Na: a = 737.0, b = 758.0, c = 1061.8 pm, β = 91.1°, Li: a = 1466, b = 1479, c = 1041 pm, β = 93.3°) with related, but not exactly know structures.
    Notes: Die kubischen verbindungen (a/pm) CsMIITiIIIF6, MII = Mg(1041,6), Ni(1043,9), Zn(1049,8), Co(1051,7), V(1052,6), Fe(1055,3), Mn(1064,9) und CsM0,5ITi1,5IIIF6, MI = K(1074,6), Rb(1080,6) wurden dargestellt. Sie kristallisieren in der modifizierten Pyrochlorstruktur des RbNiCrF6-Types, der an Einkristallen einer Oxidfluoridphase CsTi2X6 (X6 zwischen O2F4 und O3F3) erneut bestätigt wird: Raumgruppe Fd3m, a = 1028,8 pm, R = 2,6% (126 symmetrieunabhängige Reflexe). Weitere Verbindungen CsM0,5ITi1,5IIIF6 sind nach Pulveraufnahmen orthorhombisch (MI = NH4: a = 764,1, b = 767,5, c = 1087,5 pm) bzw. monoklin (Na: a = 737,0, b = 758,0, c = 1061,8 pm, β = 91,1°, Li: a = 1466, b = 1479, c = 1041 pm,β = 93,3°), mit verwandten, aber nicht genauer bekannten Strukturen.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19804670121
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  • 4
    Electronic Resource
    Electronic Resource
    Verfeinerung der 12L-Struktur des hexagonal-rhomboedrischen Elpasoliths Rb2LiFeF6Professor Werner Bues zum 60. Geburtstage am 12. November 1980 gewidmet (1980)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 469 (1980), S. 75-80 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Refinement of the 12L Structure of the Hexagonal-rhombohedral Elpasolite Rb2LiFeF6The single crystal structure determination of the hexagonal Elpasolite Rb2LiFeF6 confirmed (R = 2.4%) the compound to be isotypic to the hexagonal-rhombohedral 12 layer structure of the Cs2NaCrF6 type. The compound crystallizes with a = 588.0(3), c = 2879.0(8) pm (a = 1017.9 pm, α = 33.57°) in space group R3m. The fluorine distances of the two iron atoms differing in distortion of their octahedral coordination are 191.9(3) and 193.6(3) pm, resp. By face-sharing with FeF6 octahedra at one side and edge-sharing at the other, the LiF6 octahedra are strongly deformed, Li—F = 200.8/223.1(13), Li—Fe = 281.0(18) pm. Both rubidium atoms are 12 coordinated, average distance Rb—F = 297.7 pm. The relations of hexagonal-rhombohedral lattice constants to those of a pseudomonoclinic cell, as claimed for some Elpasolites, are pointed out.
    Notes: Die Einkristallstrukturbestimmung an dem hexagonalen Elpasolith Rb2LiFeF6 bestätigte (R = 2,4%) die Isotypie mit der hexagonal-rhomboedrischen 12-Schichtenstruktur des Cs2NaCrF6-Typs. Die Verbindung kristallisiert mit a = 588,0(3), c = 2879,0(8) pm (a = 1017,9 pm, α = 33,57°) in der Raumgruppe R≙m. Die Fluorabstände der beiden mit unterschiedlichem Verzerrungsgrad oktaedrisch koordinierten Eisenatome betragen Fe—F = 191,9(3) bzw. 193,6(3) pm. Durch die Flächenverknüpfung mit FeF6-Oktaedern auf der einen, Eckenverknüpfung auf der anderen Seite sind die LiF6-Oktaeder stark deformiert, Li—F = 200,8/223,1(13), Li—Fe = 281,0(18) pm. Die beiden Rubidiumatome sind 12fach koordiniert, Mittelwert Rb—F = 297,7 pm. Auf die Beziehungen hexagonal-rhomboedrischer Gitterkonstanten zu denen einer pseudomonoklinen Zelle, wie sie für manche Elpasolithe angegeben wurde, wird hingewiesen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19804690111
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  • 5
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    Verfeinerung der 12L-Struktur des hexagonal-rhomboedrischen Elpasoliths Rb2LiFeF6 (1980)
    Wiley
    Details
    Publication Date: 1980-10-01
    Print ISSN: 0044-2313
    Electronic ISSN: 1521-3749
    Topics: Chemistry and Pharmacology
    Published by Wiley
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  • 6
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    R�ntgenographische Untersuchungen an Titan(III)-Fluorverbindungen mit pyrochloverwandten Strukturen (1980)
    Wiley
    Details
    Publication Date: 1980-08-01
    Print ISSN: 0044-2313
    Electronic ISSN: 1521-3749
    Topics: Chemistry and Pharmacology
    Published by Wiley
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  • 7
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    Die Kristallstrukturen der Weberite Na2CuScF7 und Na2ZnAlF7 (1994)
    Wiley
    Details
    Publication Date: 1994-10-01
    Print ISSN: 0044-2313
    Electronic ISSN: 1521-3749
    Topics: Chemistry and Pharmacology
    Published by Wiley
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  • 8
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    Die Kryolithstruktur von Na3ScF6 und die Oktaederkippung in isostrukturellen Natriumhexafluorometallaten Na3MF6 (1994)
    Wiley
    Details
    Publication Date: 1994-10-01
    Print ISSN: 0044-2313
    Electronic ISSN: 1521-3749
    Topics: Chemistry and Pharmacology
    Published by Wiley
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