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  • 1
    Electronic Resource
    Electronic Resource
    Intermetallic phase formation during annealing of Al/Ni multilayers (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 7850-7859 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The phase evolution during annealing of Al/Ni multilayer samples prepared by ion-beam sputtering with composition modulation wavelengths Λ between 10 and 400 nm was determined using x-ray diffraction and differential scanning calorimeter measurements. Samples with average compositions of Al0.40Ni0.60 and Al0.75Ni0.25 were investigated. For the Al0.40Ni0.60 samples the following results were obtained. A measure of the degree of periodicity and the sharpness of the interfaces in a sample with Λ=80 nm was the large number (over 20) of peaks observed in small-angle x-ray scattering measurements. A sample with Λ=10 nm was transformed by heat treatment directly to the AlNi phase. In the Λ=80 nm sample, the first phase formed after annealing was the metastable η phase. The η phase was identified as Al9Ni2. In the 400 nm wavelength sample, both the metastable η phase and the stable Al3Ni formed after the first exothermic reaction. For the Al0.75Ni0.25 samples two results were obtained. A Λ=11.4 nm sample transformed directly on annealing into Al3Ni. The η phase was the first phase formed on annealing a Λ=100 nm sample. The difference in the component diffusivities and the concentration gradient play an important role in controlling phase formation and evolution. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357893
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  • 2
    Electronic Resource
    Electronic Resource
    Structure and magnetism of heat-treated nanocrystalline Cu80Co20 powders prepared via chemical means : 38th Annual Conference ion Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6610-6612 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nanocrystalline Cu80Co20 powders were fabricated using a chemical precipitation technique. As-prepared powders consist of metal-oxides having an average particle size of 100 A(ring). When appropriately heat treated, these powders reduce to form a CuCo face-centered cubic alloy; heat treatments at higher temperatures (≥400 °C) facilitate the phase separation of the alloy to its elemental components. Concurrent with an increase in annealing temperature, the coercive field decreases while the magnetization increases, reflecting particle coarsening and the relative amount of free cobalt in the mixture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356914
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    Paper (German National Licenses)
    Fulltext
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