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  • 1
    Electronic Resource
    Electronic Resource
    Concentration and temperature dependence of decomposition in supercooled liquid alloys (2000)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 33 (2000), S. 500-503 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Small-angle neutron scattering experiments were performed on the bulk amorphous alloy Zr41.2Ti13.8Cu12.5Ni10Be22.5 (Vit1®, subscripts indicate at.%) and on other alloys, where the (Zr,Ti) and (Cu,Be) contents were varied by following the line in composition space connecting Vit1 and Zr46.8Ti8.2Cu7.5Ni10Be27.5 (Vit4®). The small-angle neutron scattering data of the samples, annealed at temperatures between 603 K and 663 K, show interference peaks, giving evidence for spatially correlated arrangements of inhomogeneities. The Q values of the interference peaks, Qmax, decrease with increasing annealing temperature Ta and, at a given annealing temperature, with composition following the connecting line from Vit1 to Vit4. Down to the glass transition temperature Tg, the data follow a relation 1/L2 ∝ (Ts − Ta) as predicted by the linearized Cahn theory, with L = 2π/Qmax the characteristic wavelength of the decomposition and Ts the apparent spinodal temperature. Below Tg, a different behavior is observed, which may be either due to a change in atomic diffusion or due to an insufficient relaxation of the samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889899014867
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Grain-size dependence of intergranular magnetic correlations in nanostructured metals (2000)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 33 (2000), S. 451-455 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Magnetic small-angle neutron scattering experiments were performed on nanostructured Fe, Co and Ni samples of varying grain size, produced by inert-gas condensation. The experiments show that the spontaneous spatial magnetic correlations forming in zero-field extend over many individual grains. These correlations depend strongly on grain size. In Fe, they have a minimum at a grain size of around 35 nm and increase sharply for smaller grain sizes. The crossover occurs at grain sizes comparable with Lcrit = πδ, where δ is the bulk domain-wall width. For grain sizes below Lcrit, the results are explained on the basis of the random-anisotropy model, which takes into account that the magnetic alignment between the grains competes with the anisotropies of the individual grains. Above Lcrit, where domain walls can form within one grain, the magnetization direction corresponds to the anisotropy direction varying from grain to grain, and the magnetic correlation length increases approximately linearly with grain size. Furthermore, the measurements on Fe, Co and Ni show that the spatial magnetic correlations measured by SANS are always larger than Lcrit. This is in agreement with results of theoretical studies showing that nonuniform magnetization configurations can only exist in grains with sizes D 〉 Lcrit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889800099970
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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