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  • 1
    Electronic Resource
    Electronic Resource
    Direct observation of point defects in Nb12O29 by high-resolution electron microscopy (1973)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 29 (1973), S. 632-636 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Point defects have been observed directly in non-stoichiometric niobium oxides, Nb12O29, by high- resolution electron microscopy at a resolution of 3-4 Å. A proposed model for the point defect is a complex composed of two interstitial metal atoms and two interstitial oxygen atoms. Observations have been made on the annealing out of these defects under electron irradiation. Evidence on the density of these defects offers a semi-quantitative explanation of how the non-stoichiometric oxygen excess in these oxides is accommodated in the matrix structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739473001610
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  • 2
    Electronic Resource
    Electronic Resource
    High-resolution microscopy of nonstoichiometric Nb22O54 crystals: point defects and structural defects (1974)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 30 (1974), S. 251-257 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: With the use of high-resolution electron microscopy, defects have been observed in crystals of Nb22O54: two types of point defects and extended Wadsley-type defects having a structure corresponding to Nb12O29. For one type of point defect a model is proposed which contains two displaced metal atoms and two interstitial oxygen atoms within a 'block'. For the other, one metal atom and three oxygen atoms are considered to be missing from a tetrahedral site. Contributions made by the three types of defects to the non-stoichiometry of the crystals are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739474000519
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    Paper (German National Licenses)
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