TAILIEUCHUNG - Báo cáo " On some controversially-discussed Raman and IR bands of beryl "

Natural and synthetic beryl, Al2Be3Si6O18, from various deposits and manufacturers were investigated with Raman, IR spectroscopy, Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) and Electron Microprobe Analysis (EMPA). The Raman-band at 1067-1072 cm-1 and the IR-band at 1071-1207 cm-1 have been assigned till now either to Si-O or to Be-O by different studies. Following the findings in this study that the position and Full Width at Half Maximum (FWHM) of these bands were related to the concentration of silicon but not that of beryllium, it stated that these bands were. | VNU Journal of Science Earth Sciences 26 2010 32-41 On some controversially-discussed Raman and IR bands of beryl Le Thi Thu Huong1 Tobias Hager2 1 Faculty of Geology Hanoi University of Science VNU 334 Nguyen Trai Hanoi Vietnam institute of Geology Johannes Gutenberg University Mainz Germany Received 14 September 2010 received in revised form 28 October 2010 Abstract. Natural and synthetic beryl Al2Be3Si6O18 from various deposits and manufacturers were investigated with Raman IR spectroscopy Laser Ablation Inductively Coupled Plasma Mass Spectrometry LA-ICP-MS and Electron Microprobe Analysis EMPA . The Raman-band at 1067-1072 cm-1 and the IR-band at 1071-1207 cm 1 have been assigned till now either to Si-O or to Be-O by different studies. Following the findings in this study that the position and Full Width at Half Maximum FWHM of these bands were related to the concentration of silicon but not that of beryllium it stated that these bands were generated by the vibration of Si-O. Keywords Raman Infrared spectroscopy FWHM band position beryl. 1. Introduction In this study we focused on one Raman band at about 1067-1072 cm-1 and one IR band at about 1071-1207 cm-1 of the cyclo-silicate mineral beryl Al2Be3Si6O18 SiO2-67 wt AFO wt BeO-14 1 wt theoretically . The study aimed to obtain a better understanding of vibrational features of beryl and to assign precisely the presented bands to the vibrations. There have been many studies using factor group analysis to calculate lines Adams Gardner 1974 1 Hofmeister et al. 1987 2 Kim et al. 1995 3 . Nevertheless assignment of observed bands to certain vibrations was always one of the most challenging tasks in vibration spectroscopy Corresponding author. Tel. 84-4-35587061 E-mail letth@ such as Raman and Infrared Nasdala et al. 2004 4 . As calculated by Kim et a. 1995 3 and described by Moroz et al 2000 5 the Raman band at 1067-1072 cm-1 has been assigned to Be-O vibration. However this band was attributed by .

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