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  • 1985-1989  (2)
  • 1970-1974  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 44 (1988), S. 821-827 
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The potential of high-resolution electron microscopy (HREM) is demonstrated by the investigation of complex oxides with a general formula [UnMmO]- [MpO3p + l], M = (Mo, W). The HREM structure images of β-UMo2O8 agree well with the model derived from X-ray data. It is found that the γ- U3Mo20O64 sample considered earlier as a monophase appears in fact as a set of isostructural phases. The structure of these phases with MoO3 octahedral block width varying within p = 1-7 is derived from electron microscope images. Both regular and irregular substitution of cations and the formation of uranium vacancies in M-O rows are detected in γ-U3Mo20O64. Interstitial sites in the structures are detected, which can be occupied by extra U and W cations. The electron microscope images of vacancy rows give evidence for the finite length of some M-O rows. In this case oxygen dangling bonds at the ends of rows are supposed to be saturated by interstitial tungsten atoms.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 42 (1986), S. 58-61 
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 27 (1971), S. 504-505 
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 404 (1974), S. 295-298 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Phase Transition of Greigite (Fe3S4) to Pyrrhotite (FeS) by Electron BeamThe phase transition of mackinawite to pyrrhotite via greigite, which occurs on heating by means of electron beam in an electron microscope, is examined. An orientation relationship {111}G//(001)p and 〈110〉G//[110]p can be applied at the transition of greigite to pyrrhotite.
    Notes: Die Umwandlung von Mackinawit in Pyrrhotin über Greigit, die durch Erhitzen mittels Elektronenbestrahlung in einem Elektronenmikroskop auftritt, wird untersucht. Bei der Umwandlung von Greigit in Pyrrhotin läßt sich ein Orientierungszusammenhang {111}G//(001)p und 〈110〉G//[110]p anwenden.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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