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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 56 (1999), S. 183-189 
    ISSN: 1572-8943
    Keywords: IR laser ; iron oxide ; thermal analysis ; XRD
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract This paper reports on the synthesis of various iron oxides by the IR laser processing of different iron salts. X-ray diffraction techniques were used to characterize the reaction products. Some differences in terms of crystallite size and isotropy between these oxides and those obtained from the same salt by thermal means are described and explained.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1572-9605
    Keywords: superconductors ; Bi-(Pb)-Ca-Sr-Cu-O ; X-ray diffraction ; electrical resistivity ; critical current density ; SEM ; a.c. susceptibility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The Bi-(Pb)-Ca-Sr-Cu-O ceramics of typical cation composition 2 (0.4) 223, presintered at 800°C, are formed by arc melting and rapidly cooling the 2021 superconducting phase, CaO, and Cu2O. The arc-melted samples sintered in air at 840°C exhibit a solid-state structural transformation of the components and a mixture of 2122 and 2223 superconducting phases, and small amounts of Ca2CuO3, Ca2PbO4, and CuO appear. When the arc melting is used as an intermediate stage in the preparation of the high-T c superconductors in this system, a significant increase in density (from 3.7 to 5.7 g/cm3) and in critical current density (from 28 to 60 A/cm2 in zero field and at liquid-nitrogen temperature) is observed, while the critical temperature remains practically unchanged (−104 K).
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 34 (1983), S. 696-701 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es werden kinetische Untersuchungen der Ringöffnungspolymerisation des Cyclopentens dargestellt, die mit folgenden katalytischen Systemen durchgeführt werden: und Es wird der Einfluß der aluminiumorganischen Verbindung auf die Struktur der Polymere und deren Eigenschaften untersucht. Der Polymerisationsprozeß folgt in beiden Fällen demselben kinetischen Gesetz, welches eine momentane Startreaktion und eine bimolekulare Abbruchreaktion einschließt. Die erhaltenen Polymere weisen unterschiedliche Mikrostrukturen und verschiedene Eigenschaften auf. Der Unterschied ist von der Konzentration der aktiven Zentren, die sich im Falle beider katalytischer Systeme bilden, und von den Nebenreaktionen, die im Polymerisationsprozeß auftreten, abhängig.
    Notes: The report presents kinetic studies on the ring opening polymerization of cyclopentene carried out with the following catalytic systems: and The relation between the nature of the aluminium-organic compound, the structure of the polymers and some of their properties was also investigated. The polymerization follows in both cases the same kinetic pattern which include an instantaneous initiation and a bimolecular termination reaction. The resulting polymers present different microstructures and properties due to the different concentrations of active centers, which occur in the presence of the two investigated catalytic systems and to side reactions during the polymerization process.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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