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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 412-416 
    ISSN: 0044-2313
    Keywords: Alkali transition metal chalcogenides ; magnetic structures ; neutron diffraction ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Magnetic Interactions in Ternary Cobalt Chalcogenides containing Isolated Tetrahedral Cobalt Anionic Groups. The Spin Structures of Na6CoS4 and Na6CoSe4The sodium cobalt chalcogenides Na6CoS4 and Na6CoSe4 are characterized by isolated [CoX4]-units. Despite the large distances of more than 6 Å between the cobalt ions magnetic inter-actions at low temperatures lead to threedimensionally ordered spin structures, that were determined from neutron diffraction experiments. The magnetic structure can be described in the Shubnicov group P2abc21 with a unit cell that is four times as large as the crystallographic cell. The magnetic moments of both compounds correspond to the value expected for three unpaired electrons per Co2+ ion.
    Notes: Die Natriumcobaltchalkogenide Na6CoS4 und Na6CoSe4 sind durch isolierte [CoX4]-Einheiten charakterisiert. Trotz der großen Abstände der magnetischen Zentren von über 6Å führen bei tiefen Temperaturen magnetische Wechselwirkungen zu dreidimensional geordneten Spinstrukturen, die über Neutronenbeugungsuntersuchungen aufgeklärt werden konnten. Die magnetische Struktur läßt sich in der Shubnikov-Raumgruppe P2abc21 mit einer Elementarzelle beschreiben, die gegenüber der kristallographischen das vierfache Volumen besitzt. Die Größe der magnetischen Momente entspricht dem für Co2+ zu erwartenden Wert von drei ungepaarten Elektronen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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