The structure, phase composition and the properties of nanocrystalline magnetic alloys. Mössbauer, electron-microscopic and the magnetic investigation

Laser-ablation deposition of films with nominal composition Fe81B13.5Si3.5C2 from targets of Metglass 2605SC ribbons onto room temperature substrates in vacuum is reported. It is found that the density of droplets on the surface of the film is controlled mainly by variation of the laser pulse energy. Scanning electron microscopy and energy-dispersive x-ray analyses indicate that the films are ablated as stoichiometric phases. X-ray diffraction and conversion electron Mossbauer spectra show a line broadening of the amorphous pattern compatible with a decrease in average grain size compared with the ribbon target. Analysis of the hyperfine field distribution at Fe sites indicates a 23% content in nano-sized particles in the ablated films, with the particles having an estimated average grain size of about 15 nm.

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Mossbauer-effect study of the hyperfine field distributions in the residual amorphous phase of Fe-Cu-Nb-Si-B nanocrystalline alloys

Miglierini

1994

J. Phys.: Condens. Matter

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Amorphous Fq,.5,CUINb3+rSii3.5B9 (x = 0 and 1.5) alloys we% isothermally heat treated at 550' C in a vacuuh for Up to 16 h: 57Fe transmission Massbauer spedra revealed a lower rate of crystallization for x = 1.5. The annealing time dependences of the hyperfine parameters and the different behaviours of the intergranular component in both samples were sNdied via three-dimensional projenions of the hypenine held distributions. Segregation of Fe, Si and also B, from which the crystalline phases have been created, lead to a depletion of these elemene'in the residual amorphous phase. As a consequence, the number of Fe atoms with lib. Cu ' and possibly B atom in their nearest surroundings increased. giving rise to changes in the chemical and topological short-range order. The amount of the residual imorphous phase as well as its average hyperfine field decreased whereas the standard deviation of the hyperfine field dishibution increased with increasing annealing time.

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The structure, phase composition and the properties of nanocrystalline magnetic alloys. Mössbauer, electron-microscopic and the magnetic investigation

Cited by 3 publications

References 4 publications

Nuclear spectroscopy of nanocrystalline metals and alloys

Nuclear spectroscopy of nanocrystalline metals and alloys

Deposition of Fe₈₁B_13.5Si_3.5C₂films by excimer laser ablation and their structural investigation

Mossbauer-effect study of the hyperfine field distributions in the residual amorphous phase of Fe-Cu-Nb-Si-B nanocrystalline alloys

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The structure, phase composition and the properties of nanocrystalline magnetic alloys. Mössbauer, electron-microscopic and the magnetic investigation

Cited by 3 publications

References 4 publications

Nuclear spectroscopy of nanocrystalline metals and alloys

Nuclear spectroscopy of nanocrystalline metals and alloys

Deposition of Fe81B13.5Si3.5C2films by excimer laser ablation and their structural investigation

Mossbauer-effect study of the hyperfine field distributions in the residual amorphous phase of Fe-Cu-Nb-Si-B nanocrystalline alloys

Contact Info

Product

Resources

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Deposition of Fe₈₁B_13.5Si_3.5C₂films by excimer laser ablation and their structural investigation