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  • Calcium  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 123-127 
    ISSN: 0044-2313
    Keywords: Potassium ; Calcium ; Barium ; Copper ; Vanadium Oxide ; Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A new Alkaline-Alkaline-Earth-Copper-Oxovanadate: Kba3Ca4Cu3V7O28.Single crystals of Kba3Ca4Cu3V7O28 were prepared by solid state reactions below the melting point of the reaction mixture. It crystallizes with hexagonal symmetry, space group C6v4-P63mc, a=11.160, c=12.428 Å, Z=2. Kba3Ca4Cu3V7O28 represents a new structure type with special coordination polyhedra around Ba2+, trigonal prisms and octahedra around Ca2+ and Cu2+ inside square pyramids. The crystal structure will be shown and discussed.
    Notes: Einkristalle von Kba3Ca4Cu3V7O28 wurden durch Feststoffreaktionen, knapp unterhalb des Schmelzpunktes, erhalten. Die Verbindung kristallisiert hexagonal, Raumgruppe C6v4-P63mc, a=11,160, c=12,428 Å, Z=2. Kba3Ca4Cu3V7O28 repräsentiert einen neuen Strukturtyp, mit speziellen Koordinationspolyedern um Ba2+, trigonalen Prismen und Oktaedern um Ca2+ und Cu2+ in tetragonal pyramidaler Koordination. Die Kristallstruktur wird vorgestellt und diskutiert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 615 (1992), S. 101-103 
    ISSN: 0044-2313
    Keywords: Calcium ; magnesium ; zinc ; vanadium ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: An Additional Oxovanadate Phase with Garnet Structure: Ca5Mg3ZnV6O24Single crystals of Ca5Mg3ZnV6O24 were prepared by solid state reactions some degree below the melting point of the reaction mixture. It crystallizes with cubic symmetry, space group Td6-I43 d with a = 12.429 Å, Z = 4. The crystal structure is nearly related to the Garnet structure showing Ca2+ within distorted cubes (C.N. = 8) of O2- on a partly unfilled position. the octahedra position are occupied by Mg2+ and Zn2+ statistically.
    Notes: Einkristalle von Ca5Mg3ZnV6O24 wurden durch Feststoffreaktionen dicht unterhalb des Schmelzpunktes der Reaktionsmischung erhalten. Diese Substanz kristallisiert mit kubischer Symmetrie, Raumgruppe Td6-I43 d mit a = 12,429 Å, Z = 4. Die Kristallstruktur ist eng mit der Granatstruktur verwandt und zeigt Ca2+ in gestörten Würfeln von O2- (C.N. = 8) auf einer teilweise unaufgefüllten Punktlage. Die oktaedrisch koordinierten Positionen sind mit Mg2+ und Zn2+ statistisch besetzt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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