Color change of spodumene gemstone by electron beam irradiation

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Publication Details

Author list: Noithong P., Pakkong P., Naemchanthara K.

Publisher: Trans Tech Publications

Publication year: 2013

Volume number: 770

Start page: 370

End page: 373

Number of pages: 4

ISBN: 9783037857786

ISSN: 1022-6680

eISSN: 1662-8985

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84884923655&doi=10.4028%2fwww.scientific.net%2fAMR.770.370&partnerID=40&md5=d81ec95f70b707176b88f475edc4506e

Languages: English-Great Britain (EN-GB)

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Abstract

Study on the electron beam irradiation color change induction of spodumene (LiAlSi2O6) samples, which color exhibit green, pink and colorless. Characteristic the electron-beam irradiation dose were selected 30,000 kGy, 40,000 kGy and 50,000 kGy. The color and fading of spodumene samples were analyzed by UV-VIS spectrophotometer, crystal structure were determined by X-ray diffraction (XRD) spectrometer, free radical species of impurities were determined by Electron Spin Resonance (ESR) spectrometer before and after irradiation. The results revealed the color of spodumene samples changed after irradiation, from green spodumene became a little darker color, pink spodumene became green color, colorless spodumene became pink to purple color the results of the color analysis and fading displayed on the CIE L* a* b* color system, color change spodumene samples were determined by values changed of a* and b*. Color fade of spodumene were determined by values changed of L*. The results of all samples crystal structure analysis were shown on the XRD patterns of the JCPDS No. 89-6662 (Spodumene) with monoclinic structure. The radical analysis results of impurity elements, green and pink only appear the ESR pattern of manganese (Mn2+), and chromium (Cr3+), respectively. It can be conclusion that intensity of color change depend on the irradiation dose and impurity elements in spodumene samples. ฉ (2013) Trans Tech Publications, Switzerland.

Keywords

E-beam, Fading, Spodumene