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  • 1
    ISSN: 1520-5002
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Synthesis ; crystal structure ; CaFe4Sb12 ; SrRu4Sb12 ; BaRu4Sb12 ; polyantimonides ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Erdalkali-Übergangsmetall-Antimonide AT4Sb12 (A = Ca, Sr, Ba; T = Fe, Ru, Os) mit LaFe4P12-StrukturDie Titelverbindungen wurden durch Reaktion von CaSb2, SrSb2 bzw. BaSb3 mit den Übergangsmetallen und Antimon in evakuierten Quarzglasröhrchen hergestellt. Sie kristallisieren in der kubischen LaFe4P12-Struktur, die aus Röntgen-Einkristall-Daten für CaFe4Sb12, SrRu4Sb12 und BaRu4Sb12 zu Restwerten von R = 0,014, 0,016 bzw. 0,014 verfeinert wurde. Die thermischen Parameter der Erdalkaliionen nehmen mit abnehmender Ionengröße zu. Die Sb—Sb-Abstände sind in der Eisen-Verbindung größer als in den beiden Ruthenium-Verbindungen, was sich auf eine stärkere Besetzung von antibindenen Sb—Sb-Zuständen bei der Eisen-Verbindung zurückführen läßt.
    Notes: The title compounds were prepared by reaction of CaSb2, SrSb2, or BaSb3 with the transition metals and antimony in sealed silica tubes. They crystallize with the cubic LaFe4P12-structure, which was refined from single-crystal X-ray data of CaFe4Sb12, SrRu4Sb12, and BaRu4Sb12 to residuals of R = 0.014, 0.016, and 0.014, respectively. The thermal parameters of the alkaline earth ions increase with decreasing ionic size. The Sb—Sb distances are greater in the iron compound than they are in the two ruthenium compounds. This is rationalized to be due to a larger portion of electrons in antibonding Sb—Sb states in the iron compound.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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