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  • crystal structure  (2)
  • 1
    ISSN: 0044-2313
    Keywords: Sodium iron chalcogenides, Na6FeS4, Na6FeSe4 ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis, Structure, and Magnetic Properties of the Sodium Iron Chalcogenides Na6FeS4 and Na6FeSe4The compounds Na6FeS4 and Na6FeSe4 have been synthesized by fusion reactions of sodium carbonate with iron and chalcogen in a stream of hydrogen.Structural investigations on single crystals show that both compounds crystallize in an atomic arrangement isotypic with Na6ZnO4 (space group P63mc). The structure is characterized by isolated [FeX4]-tetrahedra.The magnetic susceptibilities show Curie-Weiss behaviour. The deviations at low temperatures are obviously caused by antiferromagnetic interactions.
    Notes: Durch Schmelzreaktionen von Natriumcarbonat mit Eisen und Chalkogen im Wasserstoffstrom gelang die Darstellung von Na6FeS4 und Na6FeSe4.Röntgenstrukturuntersuchungen an Einkristallen ergaben daß die beiden Verbindungen isotyp kristallisieren. Die Atomanordnung entspricht der des Na6ZnO4 (Raumgruppe P63mc). Als charakteristische Baueinheit treten isolierte [FeX4]6--Tetraeder auf.Die Temperaturabhängigkeiten der magnetischen Suszeptibilitäten lassen sich mit einem Curie-Weiss-Verhalten beschreiben. Bei tiefen Temperaturen treten Abweichungen von diesem Verhalten auf, die offensichtlich auf antiferromagnetische Wechselwirkungen zurückzuführen sind.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 1208-1210 
    ISSN: 0044-2313
    Keywords: Ternary carbides ; crystal structure ; sodium ; palladium ; platinum ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Syntheses and Crystal Structures of Ternary Carbides Na2PdC2 and Na2PtC2Na2PdC2 and Na2PtC2 were synthesized by the reaction of sodium carbide with palladium and platinum respectively. The crystal structures could be solved from X-ray powder diffraction data (space group: P3m1, Z = 1). Both compounds crystallize in a new structure type with 1∞[M(C2)2/22-] chains (M≡Pd, Pt) as the characteristic structural unit. The existence of a C—C triple bond was confirmed by Raman spectroscopy.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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