Geological Society of America

T18 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

THE HIGH FREQUENCY RAMAN BANDS OF VITREOUS SiO2

Paper number: T18-5
Program: Technical Sessions
Time: 8:50 AM – 9:05 AM

Authors

Grant Henderson Presenting Author
University of Toronto, Toronto, ON
G.Michael Bancroft
University of Western Onatrio, London, ON
Wayne Nesbitt
University of Western Ontario, London, ON
Philip A.W. Dean
University of Western Onatrio, London, ON
M. Rita Cicconi
Friedrich-Alexander-University, Erlangen-Nurnberg

Abstract

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 SiO₄tetrahedron. 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.

Geological Society of America Abstracts with Programs. Vol. 55, No. 6

doi: 10.1130/abs/2023AM-390896

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