Thin films of PtAl2 and AuAl2 by solid-state reactive synthesis

Show simple item record Supansomboon, S. Dowd, A. Gentle, A. Van der Lingen, Elma Cortie, Michael B. 2015-09-16T11:49:14Z 2015-09-16T11:49:14Z 2015-08
dc.description.abstract The intermetallic compounds AuAl2 and PtAl2 are colored purple and yellow respectively. In the past they have been prepared by bulk melting techniques or by co-deposition in a magnetron sputterer. Here, however, we investigate films of AuAl2, PtAl2 and (Au,Pt)Al2 prepared by sequential physical vapor deposition of the elements, followed by in situ solid-state reaction. The microstructure, dielectric functions, optical properties and thermal stability of the resulting films are characterized and compared to those prepared by bulk melting or codeposition. The (Au,Pt)Al2 films show a color gamut that stretches from purple to brassy yellow depending on composition and microstructure. High temperature synchrotron X-ray diffraction experiments show that the (Au,Pt)Al2 phase is metastable, decomposing when heated above 420 °C. In contrast, the pure AuAl2 or PtAl2 phases are stable to about 580 °C before they oxidize or decompose. The alternative possibility of producing the purple-to-yellow color gamut by depositing optical stacks of very thin films of AuAl2 and PtAl2 is also assessed. Either scheme will provide a range of colors lying between those of the binary compound endpoints. Calculations predict that deposition of AuAl2 onto PtAl2 will produce more intense colors than vice versa, an unexpected finding that is worth further investigation. en_ZA
dc.description.embargo 2016-08-31 en_ZA
dc.description.librarian hb2015 en_ZA
dc.description.sponsorship Royal Thai Scholarship. Part of this research was undertaken on the Powder Diffraction beamline at the Australian Synchrotron, Victoria, Australia. en_ZA
dc.description.uri en_ZA
dc.identifier.citation Supansomboon, S, Dowd, A, Gentle, A, Van Der Lingen, E & Cortie, MB 2015, 'Thin films of PtAl2 and AuAl2 by solid-state reactive synthesis', Thin Solid Films, vol. 589, pp. 805-812. en_ZA
dc.identifier.issn 0040-6090 (print)
dc.identifier.issn 1879-2731 (online)
dc.identifier.other 10.1016/j.tsf.2015.07.019
dc.language.iso en en_ZA
dc.publisher Elsevier en_ZA
dc.rights © 2015 Elsevier B.V. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Renewable and Sustainable Energy Reviews. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Renewable and Sustainable Energy Reviews, vol.589, pp. 805-812, 2015. doi :10.1016/j.tsf.2015.07.019. en_ZA
dc.subject Intermetallic compounds en_ZA
dc.subject PtAl2 en_ZA
dc.subject AuAl2 en_ZA
dc.subject Color en_ZA
dc.subject Optical properties en_ZA
dc.subject Solid state synthesis en_ZA
dc.title Thin films of PtAl2 and AuAl2 by solid-state reactive synthesis en_ZA
dc.type Postprint Article en_ZA

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