Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 723, Issue -, Pages 520-526Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.06.263
Keywords
Oxide materials; Laser processing; Phase transitions; Inelastic light scattering
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Funding
- MINECO [MAT2012-31959, MAT2015-65274-R, CSD2009-0013]
- AFOSR grant [FA9550-15-1-0142]
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The formation of different phases of Bi2O3 induced by laser irradiation of Bi films has been assessed in situ by micro-Raman spectroscopy as a function of laser wavelength, power density and irradiation time. Raman mapping of the irradiated samples enabled a spatially-resolved study of the distribution of the formed Bi2O3 phases. Red laser (633 nm) irradiation was found to induce the appearance of beta-Bi2O3, within a certain range of power densities, by diffusion-controlled processes. In contrast, ultraviolet (UV, 325 nm) laser irradiation, above a certain power density threshold, initially induces the formation of both beta and delta-Bi2O3 phases. The amount of the produced delta-Bi2O3 phase increases by increasing the irradiation time, while that of the beta phase follows the opposite trend. UV laser irradiation seems to be a suitable method to produce room temperature stable delta-Bi2O3 patterns on Bi films. (C) 2017 Elsevier B.V. All rights reserved.
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