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Raman spectra of norbergite at various pressures and temperatures

Lin-Gun Liu, Chung-Cherng Lin and Terry P. Mernagh
Raman spectra of norbergite at various pressures and temperatures
European Journal of Mineralogy (December 1999) 11 (6): 1011-1021

Abstract

The Raman spectra of natural samples of norbergite were investigated up to 320 kbar at room temperature and between 82-873 K at atmospheric pressure. Two to four well-separated OH Raman bands of norbergite were observed. Norbergite remains stable up to the maximum temperature investigated in the present study. The Raman frequencies of all the bands of norbergite were observed to increase linearly with increasing pressure, but decrease linearly or nonlinearly with increasing temperature within the experimental uncertainties and the range investigated. Unlike other dense hydrous magnesium silicates so far studied, both the temperature and pressure variations of the OH Raman bands of norbergite follow the same trend as those of the silicate (both internal and lattice modes) vibrations. A mechanism combining the H-H repulsion with hydrogen bonds elongating towards an empty polyhedron is proposed to explain this phenomenon.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 11
Serial Issue: 6
Title: Raman spectra of norbergite at various pressures and temperatures
Affiliation: Academia Sinica, Institute of Earth Sciences, Taipei, Taiwan
Pages: 1011-1021
Published: 199912
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 21
Accession Number: 2000-026834
Categories: Geophysics of minerals and rocks
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Secondary Affiliation: Australian Geological Survey Organisation, AUS, Australia
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200009
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