Micro-Raman and micro-infrared spectroscopic studies of Pb- and Au-irradiated ZrSiO[sub 4]: Optical properties, structural damage, and amorphization

Zhang, M. and Boatner, L. A. and Salje, E. K. H. and Ewing, R. C. and Daniel, P. and Weber, W. J. and Zhang, Y. and Farnan, Ian (2008) Micro-Raman and micro-infrared spectroscopic studies of Pb- and Au-irradiated ZrSiO[sub 4]: Optical properties, structural damage, and amorphization. Physical Review B (Condensed Matter and Materials Physics), 77 (14). pp. 144110-13. DOI 10.1103/PhysRevB.77.144110

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Abstract

The optical properties of damaged periodic and aperiodic domains created by Pb+ (280 keV) and Au4+ (10 MeV) implantation of zircon were studied using micro-infrared (IR) and micro-Raman spectroscopy. The Pb+ and Au4+ irradiations caused a dramatic decrease in the IR reflectivity similar to that observed for metamict natural zircon. The irradiation with 10 MeV Au4+ ions (to fluences of 1×1015 Au4+ ions/cm2) also results in the formation of an amorphized phase similar to that observed in metamict zircon. These results show that high-energy, heavy-ion irradiations provide a good simulation of the ballistic effects of the recoil nucleus of an alpha-decay event and, in both cases, the result is the creation of aperiodic domains. Additional IR and Raman features were recorded in samples irradiated with 280 keV Pb+ ions (to fluences of 1×1014 and 1×1015 Pb+ ions/cm2), indicating the formation of an irradiation-induced additional phase(s). The frequencies of the features are consistent with lead silicates, ZrO2, and SiO2. The results show that spectral features of the Au4+- and Pb+-irradiated zircon are different from those of quenched ZrSiO4 melts, and the finding further confirms that the amorphous state produced by high-energy ion irradiations is structurally different from the glassy state that results from quenching a high temperature melt. In contrast to significant changes in the frequency and width of the Raman 3 band observed in metamict zircon, the Pb+ and Au4+ irradiations do not cause similar variations, indicating that the remaining zircon crystalline domains in irradiated samples have a crystalline structure with fewer defects than those of metamict zircon.

Item Type: Article
Uncontrolled Keywords: 08AREP IA56 2008 P
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Physical Review B (Condensed Matter and Materials Physics)
Volume: 77
Page Range: pp. 144110-13
Identification Number: 10.1103/PhysRevB.77.144110
Depositing User: Sarah Humbert
Date Deposited: 16 Feb 2009 13:04
Last Modified: 23 Jul 2013 09:54
URI: http://eprints.esc.cam.ac.uk/id/eprint/830

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