作者
Patrick Schmidt, Ludovic Bellot-Gurlet, Aneta Slodczyk, François Fröhlich
发表日期
2012/6/1
期刊
Physics and Chemistry of Minerals
卷号
39
期号
6
页码范围
455-464
出版商
Springer-Verlag
简介
Chalcedony is a spatial arrangement of hydroxylated nanometre-sized α-quartz (SiO2) crystallites that are often found in association with the silica mineral moganite (SiO2). A supplementary Raman band at 501 cm−1 in the chalcedony spectrum, attributed to moganite, has been used for the evaluation of the quartz/moganite ratio in silica rocks. Its frequency lies at 503 cm−1 in sedimentary chalcedony, representing a 2 cm−1 difference with its position in pure moganite. We present a study of the 503 cm−1 band’s behaviour upon heat treatment, showing its gradual disappearance upon heating to temperatures above 300 °C. Infrared spectroscopic measurements of the silanole (SiOH) content in the samples as a function of annealing temperature show a good correlation between the disappearance of the 503 cm−1 Raman band and the decrease of structural hydroxyl. Thermogravimetric analyses reveal a …
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P Schmidt, L Bellot-Gurlet, A Slodczyk, F Fröhlich - Physics and chemistry of minerals, 2012