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GSA Connects 2023 Meeting in Pittsburgh, Pennsylvania

Paper No. 18-4
Presentation Time: 8:50 AM

THE HIGH FREQUENCY RAMAN BANDS OF VITREOUS SiO2


HENDERSON, Grant1, BANCROFT, G.Michael2, NESBITT, Wayne3, DEAN, Philip A.W.2 and CICCONI, M. Rita4, (1)Earth Sciences, University of Toronto, 22 Ursula Franklin Street, Toronto, ON M5S 3B1, Canada, (2)Chemistry, University of Western Onatrio, London, ON N6A 5B7, Canada, (3)Earth Sciences, University of Western Ontario, London, ON N6A 5B7, Canada, (4)Institute for glass and ceramics, Friedrich-Alexander-University, Erlangen-Nurnberg, Germany

We have investigated the high frequency (1000-1300cm-1) Raman spectroscopy envelope of vitreous silica (SiO2). The high frequency envelope has two broad bands at 1065 and 1200 cm-1. These bands are commonly assigned to the T2 and A1 motions of an isolated SiO4 tetrahedron. However, we show that both broad bands are composite peaks each consisting of 2 individual peaks at 1054 and 1090 cm-1 (1065 cm-1), and 1181 cm-1 and 1235 cm-1 (1200 cm-1), respectively. Furthermore, the assignment of the higher frequency band to an A1 symmetric stretch is unlikely given that polarized spectra indicate that the bands in the 1200 cm-1 envelope are highly depolarized.

Session No. 18

T154. A Session in Honor of Georges Calas, Professor Emeritus, Sorbonne Université, Paris, France, and 2023 Roebling Medalist of the Mineralogical Society of America I
Sunday, 15 October 2023: 8:00 AM-12:00 PM
315 / 316 (David L Lawrence Convention Center)
Geological Society of America Abstracts with Programs. Vol. 55, No. 6
doi: 10.1130/abs/2023AM-390896
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