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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 4
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 387 (1972), S. 161-178 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The results of X-ray single crystal work on RbNiCrF6 (a = 10.21 Å) and of powder work on KNiCrF6 (a = 10.24 Å) and KNiCrF6 · H2O (a = 10.45 Å) are reported. All three compounds crystallize cubically in the space group Fd3m. They contain a network M2X6 of octahedra, analogous to that of the pyrochlores and with distances Ni-F = Cr-F = = 1.93 ± 0.02 Å which are equal within the error of determination. The structural relations between the three compounds, and compared with the pyrochlore structure are discussed, as well as the relations to the tetragonal bronze-type structure occuring as a high pressure phase of KNiCrF6.
    Notes: Die Ergebnisse einer Einkristallstrukturbestimmung an RbNiCrF6(a = 10,21 Å) und von Pulvermessungen an KNiCrF6 (a = 10,24 Å) und KNiCrF6 · H2O (a = 10,45 Å) werden mitgeteilt. Alle drei Verbindungen kristallisieren kubisch in der Raumgruppe Fd3m und enthalten ein den Pyrochloren analoges Oktaedernetz M2X6 mit innerhalb der Fehlergrenze gleichen Abständen Ni-F = Cr-F = 1,93 ± 0,02 Å. Die strukturellen Beziehungen der drei Verbindungen untereinander und zur Pyrochlorstruktur werden diskutiert, ebenso zur tetragonalen Bronzestruktur, die als Hochdruckphase von KNiCrF6 auftritt.
    Additional Material: 2 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 406 (1974), S. 23-37 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal Structure of the Quaternary Fluoride BaLiCrF6The crystal structure of the monoclinic compound BaLiCrF6 was determined (a = 5.397, b = 10.355, c = 8.638 Å, β = 90.72°; SG P21/c, z = 4. R = 5.7% for all 1561 automatically recorded single crystal reflections hkl). The structure contains icosahedra of BaF12 (Ba-F = 2.890 Å) within a framework built up of isolated LiF4-tetrahedral (Li-F = 1.868 Å) and CrF6-octahedra (Cr-F = 1.903 Å) mutually linked by corners. All polyhedra are distorted. Structural relations and the variation of distances about the mean values given are discussed.
    Notes: Die Kristallstruktur der monoklinen Verbindung BaLiCrF6 wurde bestimmt (a = 5,397, b = 10,355, c = 8,638 Å, β = 90,72°; RG P21/c, z = 4. R = 5,7% für alle 1561 automatisch registrierten Einkristall-Reflexe hkl). Die Struktur enthält BaF12-Ikosaeder (Ba-F = 2,890 Å) innerhalb eines Raumnetzes, das aus isolierten LiF4-Tetraedern (Li-F = 1,868 Å) und CrF6-Oktaedern (Cr-F = 1,903 Å) besteht, die gegenseitig über Ecken miteinander verknüpft sind. Alle Polyeder sind verzerrt. Strukturbeziehungen sowie die Variation der Abstände um die angegebenen Mittelwerte werden diskutiert.
    Additional Material: 3 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 406 (1974), S. 38-44 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigation of Quaternary Fluorides LiMIIMIIIF6. Some Compounds of the BaLiCrF6 TypeSome monoclinically crystallizing compounds BaLiMIIIF6 (MIII = Al, Ga, Cr, V, Fe, Ti) are reported. Part of the lithium, which is tetrahedrally coordinated in the BaLiCrF6-type structures, could be replaced by Co(II) ions in solid solutions BaLiGaF6/KCoGaF6. The reflectance spectrum of tetrahedral CoF42- is given.
    Notes: Es wird über eine Reihe monoklin kristallisierender Verbindungen der Zusammensetzung BaLiMIIIF6 (MIII = Al, Ga, Cr, V, Fe, Ti) berichtet. Das in den Strukturen vom BaLiCrF6-Typ tetraedrisch koordiniert vorliegende Lithium ließ sich in Mischkristallen BaLiGaF6/KCoGaF6 partiell durch Co(II)-Ionen ersetzen. Das Reflexionsspektrum von tetraedrischem CoF42- wird mitgeteilt.
    Additional Material: 1 Ill.
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  • 8
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Redetermination of the K2CuF4 StructureThe structure of K2CuF4 was redetermined by x-rays. An enlarged tetra-gonal unit cell of dimensions a = 5.858, c = 25.42 Å was found. The refinement in spacegroup D102d-I4c2 yielded R = 0.06. Contrary to former findings the JAHN-TELLER- distortion of the CuF6-octahedra corresponds to a tetragonal elongation with distances Cu-F = 1.92 Å (4 ×) and 2.22 Å(2×).
    Notes: Die röntgenographische Neubestimmung ergab für die K2CuF4- Struktur eine Vergrößerung der tetragonalen Elementarzelle auf die Gitterabmessungen a = 5,858, c = 25,42 Å. In der Raumgruppe D102d-I4c2 ließ sich die Struktur bis R = 0,06 verfeinern. Im Gegensatz zu früheren Befunden erweist sich die JAHN-TELLER-Verzerrung CuF6-Oktaeder jetzt auch hier als gestreckt. Im Rahmen der Bestimmungsgenauigkeit sind alle Oktaeder tragonal mit Abständen Cu-F = 1,92 Å (4×) und 2,22 Å (2×).
    Additional Material: 2 Ill.
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  • 9
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: High Pressure Syntheses and Transformations of Hexagonal Elpasolithes A2IBIMIIIF6Hexagonal-rhombohedrally in the structure type of Cs2NaCrF6 crystallizing elpasolithes Rb2LiMF6 and Cs2NaMF6 (MIII = Al, Ga, V, Cr, Fe) were transformed to cubic modifications (K2NaAlF6 type) by high pressure application (15-100 kbar). In addition intermediate high pressure phases with the hexagonal structure of high temperature K2LiAlF6 could be obtained in some cases. The lattice constants of these compounds are reported, as well as those of hexagonal elpasolithes Tl2LiMF6 and Cs2LiMF6 which only form, if they are synthesized under pressure. The results are discussed in connection with the Goldschmidt tolerance factor t′ = √2(rA + rF)/(rB + rM + 2rF) of the elpasolithes mentioned.
    Notes: Von hexagonal-rhomboedrisch im Cs2NaCrF6-Typ kristallisierenden Elpasolithen Rb2LiMF6 und Cs2NaMF6 (MIII = Al, Ga, V, Cr, Fe) konnten durch Hochdruckanwendung (15-100 kbar) kubische Modifikationen (K2NaAlF6-Typ) erhalten werden. Als intermediäre Hochdruckphasen ließen sich in einigen Fällen außerdem Modifikationen mit der hexagonalen Struktur von Hochtemperatur-K2LiAlF6 fassen. Die Gitterkonstanten dieser Verbindungen werden mitgeteilt, ebenso wie diejenigen neuer hexagonaler Elpasolithe Tl2LiMF6 und Cs2LiMF6, die sich nur bilden, wenn die Synthese unter Druck erfolgt. Die Ergebnisse werden im Zusammenhang mit dem Goldschmidtschen Toleranzfaktor t′ = √2(rA + rF)/(rB + rM + 2rF) der genannten Elpasolithe diskutiert.
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  • 10
    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.
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