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  • 1
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: High Pressure Syntheses and Transformations of Hexagonal Elpasolithes A2IBIMIIIF6Hexagonal-rhombohedrally in the structure type of Cs2NaCrF6 crystallizing elpasolithes Rb2LiMF6 and Cs2NaMF6 (MIII = Al, Ga, V, Cr, Fe) were transformed to cubic modifications (K2NaAlF6 type) by high pressure application (15-100 kbar). In addition intermediate high pressure phases with the hexagonal structure of high temperature K2LiAlF6 could be obtained in some cases. The lattice constants of these compounds are reported, as well as those of hexagonal elpasolithes Tl2LiMF6 and Cs2LiMF6 which only form, if they are synthesized under pressure. The results are discussed in connection with the Goldschmidt tolerance factor t′ = √2(rA + rF)/(rB + rM + 2rF) of the elpasolithes mentioned.
    Notes: Von hexagonal-rhomboedrisch im Cs2NaCrF6-Typ kristallisierenden Elpasolithen Rb2LiMF6 und Cs2NaMF6 (MIII = Al, Ga, V, Cr, Fe) konnten durch Hochdruckanwendung (15-100 kbar) kubische Modifikationen (K2NaAlF6-Typ) erhalten werden. Als intermediäre Hochdruckphasen ließen sich in einigen Fällen außerdem Modifikationen mit der hexagonalen Struktur von Hochtemperatur-K2LiAlF6 fassen. Die Gitterkonstanten dieser Verbindungen werden mitgeteilt, ebenso wie diejenigen neuer hexagonaler Elpasolithe Tl2LiMF6 und Cs2LiMF6, die sich nur bilden, wenn die Synthese unter Druck erfolgt. Die Ergebnisse werden im Zusammenhang mit dem Goldschmidtschen Toleranzfaktor t′ = √2(rA + rF)/(rB + rM + 2rF) der genannten Elpasolithe diskutiert.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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