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  • 1990-1994  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Effect of annealing on the elastic properties of Ag/Ni superlattices (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 3028-3034 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The modifications of the effective elastic constants of sputter-deposited Ag/Ni superlattices under annealing are studied by use of the Brillouin light-scattering technique. At-temperature measurements, taken while annealing the specimens, made it possible to study the dynamical evolution of the structure under investigation, through detection of up to four guided acoustic modes. Measurements taken at room temperature, after isochronal and isothermal cycles, permitted achievement of a deeper understanding of the variations of the elastic properties. It has been found that those elastic constants that are sensitive to interface effects, namely c44 and c33, are also markedly modified during the thermal treatment; no appreciable variation of c11 has been measured. The observed variations of the elastic constants are interpreted on the basis of the structural informations gained by use of x-ray and transmission electron microscopy; a comparison is also made with electrical resistivity results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353009
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Interface effects and elastic constants of Ag/Ni superlattices studied by Brillouin scattering (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 4897-4902 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The elastic properties of sputter-deposited Ag/Ni superlattices have been studied by means of the Brillouin light scattering technique. Measurements have been taken on both free-standing and glass-supported superlattices, the former deposited at 100 K, the latter at 300 K. The two effective elastic constants c11 and c44 have been determined on specimens 5 μm thick for different superlattice periods; c44 decreases by almost 40% as the bilayer periodicity decreases from 19 to 1.3 nm, while c11 shows no appreciable variation. Measurements performed on supported specimens, 0.5 μm thick, enabled us to get information also on the constant c33, which exhibits a monotonic increase with period. The elastic anomalies found can be related to the appreciable lattice distortion observed by x-ray diffraction experiments. Both Brillouin scattering and x-ray analysis have shown that the interface quality improves appreciably when the temperature of deposition is lowered from 300 to 100 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350636
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Dielectric relaxation in water-tert-butanol mixtures. The water rich region (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 8115-8119 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Measurements of dielectric relaxation in water-tert-butanol mixtures have been performed by means of a frequency domain coaxial technique in the range 0.03–3 GHz, at 5 °C and for an alcohol mole fraction X ranging from 0 to 0.1. Experimental data give evidence for two relaxation processes whose relative amplitude and relaxation time depend on alcohol concentration. A two state model involving hydration and bulk water mutually exchanging at a finite rate is used to interpret dielectric data in the water rich region (X〈0.02). An anomalous behavior, evidenced at X*≈0.045, is interpreted as the occurrence of a self-aggregation process involving part of the alcohol molecules in the solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465637
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Elastic Characterization of AgNi Superlattices (1993)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 119-121 (Jan. 1993), p. 359-364 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/59/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.119-121.359.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    β-Relaxation in polymethylacrylate studied by light scattering (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1247-1252 
    Details
    ISSN: 0392-6737
    Keywords: Glass transitions ; Brillouin and Rayleigh scattering ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary The relaxation processes of glass-forming polymethylacrylate have been studied in a wide temperature range above the glass transition temperatureT g by means of light scattering measurements. Experimental spectra give evidence of a self-similar behaviourI(ω) ∝ ω−(1−a) over a spectral range of 2–3 decades, consistent with the predictions of the mode-coupling theory. Different from the prediction of the theory, the value ofa is strongly temperature dependent. This behaviour has been attributed to the presence of a slow secondary relaxation located in the GHz frequency region, whose strength progressively increases with temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02458808
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    Paper (German National Licenses)
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