Naslov
Structural study of Ni-Nb thin films

Autori
Radić, Nikola ; Dubček, Pavo ; Bernstorff, Sigrid ; Skoko, Željko ; Ristić, Mira ; Siketić, Zdravko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Proceedings of the 15th International Small-Angle Scattering Conference (SAS2012) / McGillivray, DJ ; Trewhella, J ; Gilbert, EP ; Hanley, TL - Sydney, 2013

ISBN
1921268158

Skup
15th International Small-Angle Scattering Conference SAS2012

Mjesto i datum
Sydney, Australija, 18.11.2012. - 23.11.2012

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Ni-Nb; thin film; GISAXS

Sažetak
Ni-Nb thin films (500 nm) have been prepared in a full range of compositions (pure Ni - pure Nb) by magnetron codeposition onto various substrates (mono-Si, sapphire, alumina, fused silica, and glass). The chemical compositions of the alloys have been determined by nuclear microanalysis methods (time-of-flight elastic recoil detection analysis (TOF-ERDA)), while the structure of the as-deposited films has been determined by X-Ray Diffraction. It has been found that the glass-forming range (25-85 at.% Ni) conforms very well with the glass forming ability estimated from molecular dynamics simulations and Miedema's theory. Below 10 at.% Nb content, the prepared films are fcc crystalline Ni(Nb) solid solutions. The Ni(Nb) (nano)crystallites (20-30 nm) are preferentially (111) oriented in the direction perpendicular to the film plane. Grazing incidence small angle x-ray scattering (GISAXS) results indicate that the surface contributions dominate in the GISAXS patterns from the nickel rich samples, where the scattering is relatively diffuse due to the irregular surface. Augmenting the Nb content of the samples, the sample surfaces become smoother, and the GISAXS pattern become better defined. In the glass-forming range, the surface structure becomes island-like, with a narrow size distribution both vertically and horizontally. When scattering pattern taken at wider angles are compared to those taken at the critical angle, the bulk contribution scattering can also be deduced. The sizes of bulk features are fairly similar for most concentrations. However, the values that stand out are in the glass-forming range, as well as with 90%Ni content, where the bulk features appear to be 50% bigger.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija

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