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  • 1970-1974  (4)
  • 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
    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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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Zur Biosynthese von Biopterin in Säugetieren (1973)
    Springer
    Cellular and molecular life sciences 29 (1973), S. 1481-1482 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Biosynthesis of biopterin in mice and rats was studied. After vascular injection of14C-GTP (U) in mice and rats, radioactive biopterin was isolated from the urine. The specific radioactivity of 6-carboxypterin obtained by oxidation of biopterin was proved to be 7/9 that of biopterin. The result definitely shows that biopterin is biosynthesized from GTP in mice and rats, and the sidechain of biopterin is derived directly from the ribose moiety of GTP.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01943868
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    Paper (German National Licenses)
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  • 4
    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)
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