Add time:08/13/2019         Source:sciencedirect.com

Electron irradiation was performed on topazes of two origin from Mogok valley of Mandalay, in Myanmar and Yen Bai province, in Vietnam. The samples were irradiated with 20 MeV electron beam (e-beam) to fluences of 1.34×1016 cm-2 and 2.65×1016 cm−2, respectively. Their characteristic spectra were investigated by UV–vis, EPR, FTIR and WD-XRF spectroscopy for comparison to natural state samples. Interaction between a radiation defect and impurity ions after irradiation resulted in sky blue topaz, which had the broad absorption band at 620 nm. The samples EPR lines, occurring a single broad isotropic line with g = 2.012, are correlated with an O- center interacting with two Al ions in the zigzag aluminum octahedral chains of the topaz structure. FTIR spectra indicated that the smoky or sky blue color may originated from the decomposition of hydroxyl group (OH) by the e-beam irradiation.

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