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  • 1970-1974  (2)
  • 1974  (2)
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  • 1970-1974  (2)
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  • 1
    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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  • 2
    Electronic Resource
    Electronic Resource
    Single crystals of T-Nb2O5 obtained by slow cooling method under high pressures (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 410 (1974), S. 313-315 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Darstellung von T—Nb2O5-Einkristallen durch langsames Abkühlen unter hohem DruckNiob(V)-oxid in der T-Modifikation wurde bei 1800 K und 20 kbar in Gegenwart von H2O als Mineralisator in klaren Kristallen gewonnen. Das Präparat war frei von F, Cl und OH. Gitterkonstanten und d-Werte vgl. Tab. 1 und 2.
    Notes: The T form of niobium(V) oxide was prepared in clear crystals at 1800 K and 20 kbar in the presence of water as mineralizer. The sample was free of F, Cl, and OH. Lattice constants and X-ray data see table 1 and 2.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744100311
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    Paper (German National Licenses)
    Fulltext
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