9-13 July 2012
Africa/Johannesburg timezone
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Segregation measurements of In and S on a Cu(In,S) ternary alloy using Auger Electron Spectroscopy coupled with a linear programmed heater

12 Jul 2012, 14:50
20m
Oral Presentation Track A - Division for Condensed Matter Physics and Materials DCMPM2

Speaker

Mr Moshawe Madito (Student)

Main supervisor (name and email)<br>and his / her institution

terblansjj@ufs.ac.za (Prof. Terblans)

Abstract content <br> &nbsp; (Max 300 words)

Segregation is playing a very significant role during heat treatments to engineer the composition and properties of grain boundaries and surfaces of a crystal [1]. There is large number of segregation studies on the segregation of impurities form Cu [2–6]. Despite the considerable number of publication concerning segregation of impurities from a Cu crystal, no study was found for In segregating from a Cu crystal. Therefore, this study is most likely the first to report on the segregation of In from a Cu crystal. In this study a dilute Cu(In,S) ternary alloy was prepared by diffusion doping. The segregation behaviour of In and S was measured using Auger Electron Spectroscopy (AES) coupled with a linear programmed heater. From the measured segregation profiles it was found that the In segregated first followed by S. The S completely replaced the In from the surface indicating that S has as larger segregation energy than In. From the segregation profiles the segregation parameters, namely the pre-exponential factor (D0), the activation energy (Q), the interaction energies (Ω) and the segregation energies (∆G) were extracted with the modified Darken model for In (D0 = 2.2 ± 0.5 × 10-5 m2 s-1, Q = 184.3 ± 1.0 kJ mol-1, ∆G = −62.8 ± 1.4 kJ mol-1, ΩCu−In = 3.0 ± 0.4 kJ mol-1) and S (D0 = 8.8 ± 0.5 × 10-3 m2 s-1, Q = 213.0 ± 3.0 kJ mol-1, ∆G = −120.0 ± 3.5 kJ mol-1, ΩCu−S = 23.0 ± 2.0 kJ mol-1). The interaction energy for In and S was ΩIn−S = −4.0 ± 0.5 kJ mol-1.

References
[1]N.H. Heo, Metals and Materials, 2 (1) (1996) 49.
[2]E.C. Viljoen and J. du Plessis, Surface and Interface Analysis, 22 (1994) 598.
[3]E.C. Viljoen and J. du Plessis, Surface and Interface Analysis, 23 (1995) 110.
[4]J.J. Terblans. and G. N. van Wyk, Surface and Interface Analysis, 36 (2004) 935.
[5]J.Y. Wang, J. du Plessis, J.J. Terblans and G.N. vanWyk, Surface Science, 423 (1999) 12.
[6]J.J. Terblans, H.C. Swart, e-Journal of Surface Science and Nanotechnology, 7 (2009) 480.

Apply to be<br> consider for a student <br> &nbsp; award (Yes / No)?

No

Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?

Yes

Level for award<br>&nbsp;(Hons, MSc, <br> &nbsp; PhD)?

PhD

Primary author

Mr Moshawe Madito (Student)

Co-authors

Prof. Hendrik Swart (Professor) Prof. Koos Terblans (Professor)

Presentation Materials

There are no materials yet.

Peer reviewing

Paper