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  • 1975-1979  (5)
  • 1
    Electronic Resource
    Electronic Resource
    A simple model for studying the magnetism of an actinide impurity in a disordered transition host (1977)
    Springer
    Journal of low temperature physics 27 (1977), S. 593-616 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present a theoretical model able to describe the occurrence of localized magnetism in disordered systems such as A x B1−x Ac, where A and B are two transition elements and Ac is an actinide impurity. The disordered host is treated within the coherent potential approximation (CPA); thed level of the actinide impurity creates a Slater-Koster-liked scattering potential and thef states of the actinide impurity are broadened by thed–f hybridization. The occurrence of magnetic-nonmagnetic transitions as a function ofx is discussed within the Hartree-Fock approximation. In the limiting casesx=0 andx=1, this model improves the previous theories for the magnetism of an actinide impurity in a pure transition host and in the general case it permits some predictions, especially for the system Pd x Th1−x Pu.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00655290
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Isomer shifts at rare-earth impurities in s-p metals (1979)
    Springer
    Journal of low temperature physics 37 (1979), S. 241-256 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We use a simple model, consisting of an Anderson-Moriya d resonance on a conduction band strongly perturbed by a Slater-Koster repulsive potential, to describe a rare earth impurity in an s-p metallic host. The calculation of the isomer shift is performed in two steps. First we solve the impurity problem, obtaining the s, p, and d occupation numbers at the impurity site. Then we deal with an atomic calculation of the rare earth probe, where outer electron (5d, 6s, 6p) occupation numbers are obtained from the corresponding occupations at the impurity site. We obtain the total electronic amplitude at the rare earth nucleus and define a convenient parameter in order to compare our theoretical predictions with experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00119187
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Low-temperature specific heat and electrical resistivity of nearly ferromagnetic actinide systems within a coupledd andf band model (1976)
    Springer
    Journal of low temperature physics 25 (1976), S. 47-66 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In order to describe nearly ferromagnetic actinide systems we present here a spin-fluctuation model which considers two narrowd andf bands and which takes into account the two-bodyd–f coupling parameterJ df . The magnetic susceptibility, the γ-coefficient of the linearT term of the electronic specific heat, and theT 2 coefficient of the electrical resistivity are derived at low temperatures and a comparison with experiments is presented. This model improves the description of compounds such as UAl2 and USn3 with respect to previous single-f-band theories and yields an estimation of the enhancement factor of the low-temperature magnetic susceptibility in satisfactory agreement with experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654824
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Olefin polymerization in liquid sulfur dioxide initiated by m-chloroperbenzoic acid. II. Copolymerization of styrene and α-methylstyrene (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 16 (1978), S. 2431-2439 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Copolymerizations of styrene (Sty) and α-methlstyrene (AMS) were carried out in liquid sulfur dioxide at -10°C and at -40°C with m-chloroperbenzoic acid (MCPBA) as initiator. Reactivity ratios were determined by the methods of Fineman-Ross and Kelen-Tüdös, from polymer composition obtained by nuclear magnetic spectroscopy. As indicated by thermogravimetric analysis, a block copolymer was obtained at -40°C.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.170161003
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Olefin polymerization in liquid sulfur dioxide initiated by m-chloroperbenzoic acid. I. Homopolymerization of styrene and α-methylstyrene (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 16 (1978), S. 2423-2429 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Homopolymerizations of styrene (Sty) and α-methylstyrene (AMS) in liquid sulfur dioxide were carried out in the temperature range from -10°C to -78°C, using m-chloroperbenzoic acid as initiator. It is shown, through the effect of initiator concentration, temperature, and times of reaction on the conversion and molecular weight of the polymers, that AMS is more reactive than Sty because it requires a smaller amount of initiator for the same conversion to be reached, although the molecular weight of the resulting polymer is lower. A linear relationship has been observed for Sty between the degree of polymerization and the initiator concentration. Within the experimental conditions employed, the presence of polysulfones has been discarded by elemental analysis. The polymerization reactions are considered to be cationic in mechanism.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.170161002
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    Paper (German National Licenses)
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