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Laser Effects on Phase Transition for Cubic Sb2O3 Microcrystals under High Pressure

Abstract

The effects of laser irradiation and high pressure on the phase transition of cubic phase antimony trioxide microcrystals are investigated. High pressure is performed by in situ Raman spectroscopy method in a diamond anvil cell up to 45 GPa. The results indicate that two pressure-induced isostructural phase transitions occur at 4.5 GPa and 11.3 GPa, and are independent of laser irradiation. The Sb2O3 sample initially transforms to a high density amorphous phase at 25 GPa, and finishes at more than 35 GPa. After irradiation for 7 minutes by 514.5 nm laser with 8 mW, the required pressure of complete phase transition reduces down to 27 GPa. When releasing to ambient pressure the samples reverse partly to cubic and take days for complete transition. This transition duration reduces to seconds after irradiated by laser. It is also found that the residual amorphous phase at ambient pressure is of low density and medium-range order which is not similar to the one that observed at more than 25 GPa. The mechanism of laser irradiation boost up the process of phase transitions is studied. Combining the cut-off wavelength of laser irradiation and absorption spectra, the photothermal effect induced via laser irradiation dominates phase transition.

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Publication details

The article was received on 27 Mar 2017, accepted on 11 May 2017 and first published on 11 May 2017


Article type: Paper
DOI: 10.1039/C7TC01289F
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Laser Effects on Phase Transition for Cubic Sb2O3 Microcrystals under High Pressure

    Z. Sui, S. Hu, H. Chen, C. Gao, H. Su, A. Rahman, R. Dai, Z. Wang, X. Zheng and Z. Zhang, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC01289F

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