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Structure of nickel layers in ni-C multilayer coatings: influence of annealing.

Structure of nickel layers in ni-C multilayer coatings: influence of annealing.

Journal of X-ray science and technology (1992-01-01)

G E van Dorssen, E J Puik, M J van der Wiel, P Mackle, H A Padmore, I H Munro

ABSTRACT

The structure of Ni-C multilayer and single nickel layer samples has been analyzed before and after annealing, using two techniques: fluorescence EXAFS (F1EXAFS) at the Ni-K. edge and CuKα reflection. Annealing at a temperature of 450°C resulted in a change in the structure of the nickel layers from amorphous like to crystalline like. A reduction of the Bragg reflectivity by a factor of 7 was also found. Comparison between the EXAFS data of the annealed sample and of a nickel foil show a difference in the amplitude of the EXAFS. This is ascribed to a non-Gaussian atomic distribution of the backscattering atoms in the annealed sample around their average positions, whereas the atomic distribution in the (polycrystalline) Ni foil is a Gaussian one. From the annealing experiments we conclude that no irreversible changes take place in the structure of the nickel layers at temperatures below 200°C.

MATERIALS

Product Number

Brand

Product Description

Nickel, foil, 2m coil, thickness 0.015mm, 99.9%

Nickel, foil, not light tested, 50x50mm, thickness 0.0025mm, 99.95%

Nickel, foil, 50x50mm, thickness 0.125mm, as rolled, 99.999%

Nickel, foil, 25x25mm, thickness 0.3mm, annealed, 99%

Nickel, foil, 50x50mm, thickness 0.3mm, as rolled, 99.999%

Nickel, foil, 25x25mm, thickness 2.0mm, annealed, 99%

Nickel, foil, 25x25mm, thickness 0.125mm, as rolled, 99.999%

Nickel, foil, 2m coil, thickness 0.025mm, coil width 600mm, as rolled, 99%

Nickel, foil, 50x50mm, thickness 1.0mm, as rolled, 99.999%

Nickel, foil, 50x50mm, thickness 2.0mm, annealed, 99%

Nickel, foil, 150x300mm, thickness 0.25mm, annealed, 99.98%

Nickel, foil, 2m coil, thickness 0.02mm, 99.9%

Nickel, foil, 150x300mm, thickness 0.5mm, annealed, 99.98%

Nickel, foil, not light tested, 50x50mm, thickness 0.007mm, 99.95%

Nickel, foil, 50x50mm, thickness 0.5mm, annealed, 99.98%

Nickel, foil, 25x25mm, thickness 3.2mm, as rolled, 99.99+%

Nickel, foil, 4mm disks, thickness 0.025mm, 99.9%

Nickel, foil, 0.5m coil, thickness 0.025mm, 99.9%

Nickel, foil, 50x50mm, thickness 3.2mm, as rolled, 99.99+%

Nickel, foil, not light tested, 25x25mm, thickness 0.001mm, 99.95%

Nickel, foil, not light tested, 25x25mm, thickness 0.0005mm, temporary acrylic support, 99.95%

Nickel, foil, light tested, 100x100mm, thickness 0.007mm, 99.95%

Nickel, foil, not light tested, 100x100mm, thickness 0.002mm, 99.95%

Nickel, foil, 0.5m coil, thickness 1.0mm, annealed, 99%

Nickel, foil, 0.5m coil, thickness 0.05mm, annealed, 99%

Nickel, foil, 2m coil, thickness 0.25mm, annealed, 99%

Nickel, foil, 0.3m coil, thickness 0.125mm, as rolled, 99.99+%

Nickel, foil, 10mm disks, thickness 0.025mm, as rolled, 99.99+%

Nickel, foil, 0.5m coil, thickness 0.15mm, coil width 12mm, annealed, 99%

Nickel, foil, 2m coil, thickness 0.5mm, annealed, 99.98%