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Kopcewicz, M.; Jagielski, J.; Grabias, A.

doi:10.1088/0953-8984/12/10/314

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“…As a result of splat cooling from the melt, β-Ti(Fe) or Ti-Fe(Ti) solid solutions with the solubility range enhanced up to 50% have been formed [18]. The amorphous FeTi phase was formed by vapour quenching [15], sputtering [14][15][16]19], mechanical alloying [20] and ion implantation [21]. Amorphization of the crystalline Fe/Ti multilayers by ion-beam mixing with Xe ions of energy of 800 keV was also demonstrated [22].…”

Section: Introductionmentioning

confidence: 99%

Structural transformations induced in Fe/Ti multilayers by Ar- and Kr-ion irradiation

Kopcewicz

Jagielski

Stobiecki

2005

J. Phys.: Condens. Matter

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The structural transformations in Fe/Ti multilayers induced by Ar- and Kr-ion irradiation are studied by conversion electron Mössbauer spectroscopy (CEMS). Samples of Ti-to-Fe thickness ratios β = dTi/dFe = 1 (nominal composition Fe0.6Ti0.4) and β = 1.5 (Fe0.5Ti0.5) with modulation wavelengths Λ = 10–60 nm (Λ = dFe+dTi, where dFe and dTi are the elemental thickness of Fe and Ti layers) were used. The total thickness of the films was 240 nm. The ion-beam mixing of multilayers was induced by 200 keV Ar2+ and 350 keV Kr2+ ion irradiation with fluences ranging from 5 × 1013 to 1.3 × 1017 cm−2 (Ar) and 0.5 × 1013 to 5.6 × 1016 cm−2 (Kr). The ranges of Ar and Kr ions were about 105 and 95 nm, respectively. Ion-beam mixing process leads at low ion fluence to the formation of the solid state solution bcc-FeTi which at higher ion fluences converts to the amorphous FeTi phase. The degree of amorphization depends on the ion fluence, composition of the FeTi system and modulation wavelength. It was noted that the mixing efficiency is considerably larger for heavier ions (Kr as compared with Ar). The relative fractions of given phases were determined from the CEMS measurements. Deterioration of the amorphous phase and partial restoration of the bcc-FeTi solid solution at highest Ar-ion fluences was observed. The results were interpreted based on the enthalpy curves for amorphous FeTi and bcc-FeTi solid solutions.

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