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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 651-654 
    ISSN: 0044-2313
    Keywords: Barium, copper, arsenic, oxide ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Crystal Structure of Barium-Copper-Orthoarsenate BaCu2(AsO4)2Single crystals of BaCu2(AsO4)2 were prepared above 1 000°C by CO2-LASER technique and investigated by X-ray structure determination. The light blue crystals show monoclinic symmetry, space group C2h5—P21/n, a = 4.752; b = 8.506; c = 8.945 Å; β = 93.49°, Z = 2. BaCu2(AsO4)2 represents a hitherto unknown structure type with Cu2+ in trigonal bipyramidal coordination. Ba2+ shows an 8 + 2 surrounding by O2- and As5+ is tetrahedrally coordinated. The crystal structure is discussed with respect to related orthophosphates and vanadates.
    Notes: Mit CO2-LASER-Technik wurden bei ca. 1 000°C Einkristalle der Verbindung BaCu2(AsO4)2 dargestellt und röntgenographisch untersucht. Die blaßblauen Kristalle haben monokline Symmetrie, Raumgruppe C2h5—P21/n, mit a = 4,752; b = 8,506; c = 8,945 Å; β = 93,49°, Z = 2. BaCu2(AsO4)2 repräsentiert einen neuen Strukturtyp, der Cu2+ in trigonal bipyramidaler Koordination zeigt. Ba2+ ist 8 + 2-fach und As5+ tetraedrisch von Sauerstoff umgeben. Die Kristallstruktur wird unter Bezug auf verwandte Orthophosphate und -vanadate 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 620 (1994), S. 319-322 
    ISSN: 0044-2313
    Keywords: Cobalt, arsenic, nickel, oxide ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A Contribution about a New Cobalt-rich Oxoarsenate/-vanadate: Co5AsVO10Single crystals of Co5AsVO10 were prepared by solid state reactions and investigated by X-ray structure determination. It crystallizes with monoclinic symmetry, space group C2h3-C2/m, a = 19.134, b = 6.095, c = 17.482 Å, β = 133.37°; Z = 8. The new structure type is characterized by layers of CoO6- and AsO6-octahedra with partly alternating occupation. The layers are connected by Co2+ within tetrahedral oxygen coordination and tetrahedra around statistically occupied point positions of V5+ /As5+.
    Notes: Einkristalle von Co5AsVO10 wurden durch Feststoffreaktionen erhalten und röntgenographisch untersucht. Diese Verbindung kristallisiert mit monokliner Symmetrie, Raumgruppe C2h3-C2/m; a = 19,134; b = 6,095; c = 17,482 Å; β = 133,37°; Z = 8. Der neue Strukturtyp ist durch CoO6- und AsO6-Oktaederschichten ausgezeichnet, die teilweise alternierend mit Co2+ und As5+ besetzt sind. Die Oktaederschichten werden durch Co2+ in tetraedrischer Koordination und statistisch mit V5+ und As5+ besetzte Punktlagen verknüpft.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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