Spectroscopic study of natural quartz samples

In this work we performed a spectroscopic characterization of natural amethyst, citrine, and prasiolite samples from different localities. These materials were examined by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), UV-visible spectroscopy (UV-vis), electron param...

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Bibliographic Details
Published in:Radiation physics and chemistry (Oxford, England : 1993) England : 1993), 2013-09, Vol.90, p.79-86
Main Authors: Nunes, Eduardo H.M., Lameiras, Fernando S., Houmard, Manuel, Vasconcelos, Wander L.
Format: Article
Language:English
Subjects:
atomic absorption spectrometry
bleaching
Color
electron paramagnetic resonance spectroscopy
Emission analysis
Fourier transform infrared spectroscopy
Fourier transforms
Gamma radiation
Gamma rays
Heat treatment
Inductively coupled plasma
Infrared spectroscopy
quartz
Spectroscopy
Ultraviolet radiation
ultraviolet-visible spectroscopy
X-ray diffraction
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Summary:In this work we performed a spectroscopic characterization of natural amethyst, citrine, and prasiolite samples from different localities. These materials were examined by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), UV-visible spectroscopy (UV-vis), electron paramagnetic resonance (EPR), and inductively coupled plasma atomic emission spectrometry (ICP-AES). Samples were used in this study in as-received, gamma-irradiated, UV-irradiated, and heat-treated conditions. We observed the changes in the FTIR, UV-vis, and EPR spectra of these samples as a function of the condition they were analyzed. We noticed that gamma radiation had a great effect on the color of amethyst and citrine samples used in this work. It was observed that light colored samples showed a deepening of their colors upon gamma-irradiation and a bleaching upon heat treatment at 450 degree C. However, we observed that gamma radiation had a slight effect on the color of citrine. UV-irradiations revealed that the coloration of both amethyst and prasiolite can be bleached by UV radiation. On the other hand, the color of citrine was not affected by UV radiation.
ISSN:0969-806X
DOI:10.1016/j.radphyschem.2013.05.003