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  • 1975-1979  (5)
  • 1
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 35 (1979), S. 142-145 
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The crystal structure of bismuth tungstate, Bi2W2O9, has been examined by 1 MV high-resolution electron microscopy. The symmetry is orthorhombic with lattice parameters a = 5.43, b = 5.41 and c = 23.7 Å and space group Pna21. The point group is determined directly from the images in which each cation site is resolved. The structure is similar to that of conventional layered Bi compounds with respect to the Bi2O2 sheets normal to the c axis; however, the layer between the sheets is of a deformed ReO3 type. The strong chemical bonds between the Bi ions and the apex O atoms cause the rotation of the WO6 octahedron about the c axis. W ions are displaced antiparallel in the WO3 layer.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 33 (1977), S. 701-703 
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The crystal structure of a bismuth titanate, Bi7Ti4NbO21, was determined on the basis of super-high- resolution images, taken by a recently constructed 1000 kV electron microscope, in which each cation site was approximately defined. It was found that the crystal has a mixed-layer structure, i.e. Bi4Ti3O12 and Bi3TiNbO9-like layers are alternately intergrown. The symmetry is orthorhombic with space group I2cm. The lattice parameters are a = 5.45, b = 5.42 and c = 58.1 Å. That the periodicity along c is twice that expected from a simple intergrowth can be accounted for by the rotation of octahedra. The lattice defects found are discussed in terms of twinning of the crystal.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 34 (1978), S. 1063-1064 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Tiaramide in 10−4 or 10−5 M depressed the ADP-induced aggregation of rabbit platelets using the turbidimetric method. In modified Chandler's loop method, tiaramide in the same concentration accelerated the restoration of the time course of disaggregation.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 415 (1975), S. 185-189 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Die thermische Zersetzung von Nb3O7Cl und NbO2FDie thermische Zersetzung von Nb3O7Cl in Argon sowie Sauerstoff wurden untersucht und folgende Reaktionen gefunden: Die Zersetzungsprodukte in beiden Atmosphären waren T-Form- und H-Form-Nb2O5. Es wurde jedoch beobachtet, daß die Impfung des Ausgangsmaterials Nb3O7Cl mit der besonderen polymorphen Nb2O5-Form zu einem groß Anteil dieser Form im Zersetzungsprodukt führt.NbO2F wurde in Sauerstoffatmosphäre zersetzt. Das Zersetzungsprodukt war P-Form-Nb2O5, das in N-Form-Nb2O5 überging. Bei der thermischen Zersetzung von NbO2F wurde kein Impfeffekt beobachtet.
    Notes: The thermal decompositions of Nb3O7Cl in atmosphere of argon and oxygen were carried out and the decomposition formulae were determined as follows: The decomposition products in each atmospheres were found to be the T-form Nb2O5 and H-form Nb2O5. It was, however, observed that if an amount of special polymorphic form of Nb2O5 has been added to the starting material, Nb3O7Cl, the decomposition product came to contain a larger proportion of the seeded form.NbO2F was decomposed in the oxygen atmosphere. The decomposition product appeared as the P-form Nb2O5 and transformed into the N-form Nb2O5. In the case of the thermal decomposition of NbO2F, no appreciable seeding effect was observed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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