Abstract
Abstract Thermally Stimulated Depolarization Current (TSDC) spectra of untreated pink, green and blue beryl samples show a single peak centered at 200 K, unaffected by heat and linearly dependent on the polarization field, a typical behaviour of defects with a dipolar origin. When the samples are thermally treated above 1000 K in air two new peaks appear at 170 K and 220 K. Above 1200 K water is removed from the channels of the beryl, the Fe2+ is reduced into Fe2+ and the formation of iron dipoles is then enhanced, giving rise to the observable bands. An increase in the peak height of the 170 K and the 220 K bands is observed when the samples are ultraviolet (UV) illuminated after the heat treatments. UV illumination of the samples leads to the photodissociation of hydroxyls followed by the displacement of the hydrogen to isolated sites, thereby contributing to the formation of iron dipoles.
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