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Laser-induced oxidation kinetics of bismuth surface microdroplets on GaAsBi studied in situ by Raman microprobe analysis

Journal Article


Abstract


  • We report the cw-laser-induced oxidation of molecular-beamepitaxy grown GaAsBi bismuth surface microdroplets investigated in situ by micro-Raman spectroscopy under ambient conditions as a function of irradiation power and time. Our results reveal the surface droplets are high-purity crystalline bismuth and the resultant Bi2O3 transformation to be β-phase and stable at room temperature. A detailed Raman study of Bi microdroplet oxidation kinetics yields insights into the laser-induced oxidation process and offers useful real-time diagnostics. The temporal evolution of new β-Bi2O3 Raman modes is shown to be well described by Johnson-Mehl-Avrami-Kolmogorov kinetic transformation theory and while this study limits itself to the laser-induced oxidation of GaAsBi bismuth surface droplets, the results will find application within the wider context of bismuth laser-induced oxidation and direct Raman laser processing.

Authors


Publication Date


  • 2014

Citation


  • Steele, J. A. & Lewis, R. A. (2014). Laser-induced oxidation kinetics of bismuth surface microdroplets on GaAsBi studied in situ by Raman microprobe analysis. Optics Express, 22 (26), 32261-32275.

Scopus Eid


  • 2-s2.0-84920121206

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3370

Number Of Pages


  • 14

Start Page


  • 32261

End Page


  • 32275

Volume


  • 22

Issue


  • 26

Abstract


  • We report the cw-laser-induced oxidation of molecular-beamepitaxy grown GaAsBi bismuth surface microdroplets investigated in situ by micro-Raman spectroscopy under ambient conditions as a function of irradiation power and time. Our results reveal the surface droplets are high-purity crystalline bismuth and the resultant Bi2O3 transformation to be β-phase and stable at room temperature. A detailed Raman study of Bi microdroplet oxidation kinetics yields insights into the laser-induced oxidation process and offers useful real-time diagnostics. The temporal evolution of new β-Bi2O3 Raman modes is shown to be well described by Johnson-Mehl-Avrami-Kolmogorov kinetic transformation theory and while this study limits itself to the laser-induced oxidation of GaAsBi bismuth surface droplets, the results will find application within the wider context of bismuth laser-induced oxidation and direct Raman laser processing.

Authors


Publication Date


  • 2014

Citation


  • Steele, J. A. & Lewis, R. A. (2014). Laser-induced oxidation kinetics of bismuth surface microdroplets on GaAsBi studied in situ by Raman microprobe analysis. Optics Express, 22 (26), 32261-32275.

Scopus Eid


  • 2-s2.0-84920121206

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3370

Number Of Pages


  • 14

Start Page


  • 32261

End Page


  • 32275

Volume


  • 22

Issue


  • 26