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  • 1990-1994  (3)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    A study of Cu50Fe50 produced by mechanical alloying and its thermal treatment (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 4061-4067 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A specimen of Cu50Fe50 equiatomic composition was mechanically alloyed (MA) by ball milling starting from the pure elements, which are immiscible according to the equilibrium phase diagram. Structural analysis by x-ray and neutron diffraction has shown that the mechanical process initially reduces the crystallite size of both elements as a function of the milling time. The diffraction data show that the bcc iron phase is subsequently consumed, due to progressive incorporation of the iron atoms into the fcc copper matrix. The Mössbauer spectra of a specimen MA for 16 h has a broad magnetic profile typical of a Fe-Cu extended solid solution, with some evidence of two local environments of the iron atoms and a small admixture of the γ-Fe. The annealing of these MA treated specimens effects a decomposition of the extended solid solution into FCC copper and both α- and γ-iron allotropes. This decomposition process is discussed in relation to spinodal decomposition and to nucleation-and-growth mechanisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357354
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Low-temperature X-ray diffraction examination of In2Se3 (1990)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 23 (1990), S. 340-341 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Indium selenide, In2Se3, has been examined by X-ray diffraction in the temperature interval from 300 to 5 K. Coefficients of thermal expansion for the rhombohedral α-In2Se3 phase in the low-temperature range have been determined and the appearance of a new phase at temperatures below 1̃60 K was confirmed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889890002710
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Muon-hydrogen correlation in nickel-titanium metallic glass (1991)
    Springer
    Hyperfine interactions 64 (1991), S. 665-670 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements of muon spin rotation in a transverse magnetic field in the Ni35Ti65 metallic glass saturated with hydrogen are reported. The experiment was carried out on the μSR facility at ISIS/RAL. Chilton, UK. The decay of the muon precession has a gaussian form below 150 K. Above this temperature motional narrowing occurs, the linewidth falling to the background value at about 300 K. The linewidth is almost entirely determined by the dipolar interaction between the muon and proton spins and the line narrowing is due to the correlated motion of the muon-hydrogen system. The activation energies and jump rates deduced from these measurements and from nuclear magnetic dipolar relaxation are compared.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02396202
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    Paper (German National Licenses)
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