Authors:
A. Smallwood University of Technology Sydney Department of Chemistry, Materials and Forensic Sciences Sydney Australia NSW 20007 P. O. Box 123 Broadway Sydney Australia NSW 20007 P. O. Box 123 Broadway

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P. Thomas University of Technology Sydney Department of Chemistry, Materials and Forensic Sciences Sydney Australia NSW 20007 P. O. Box 123 Broadway Sydney Australia NSW 20007 P. O. Box 123 Broadway

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A. Ray University of Technology Sydney Department of Chemistry, Materials and Forensic Sciences Sydney Australia NSW 20007 P. O. Box 123 Broadway Sydney Australia NSW 20007 P. O. Box 123 Broadway

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P. Šimon Slovak University of Technology Department of Physical Chemistry, Faculty of Chemical and Food Technology Bratislava Slovak Republic 812 37 Radlinského 9 Bratislava Slovak Republic 812 37 Radlinského 9

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Abstract  

The dehydration of samples of a Coober Pedy, South Australian sedimentary white opal, displaying play of colour, was investigated using TMA by heating the samples of the specimen to a range of temperatures between room temperature and 1000 at 200C intervals followed by cooling to room temperature. Etched fracture surfaces of the samples were then examined using SEM. The samples showed the typical expansion at low temperature up to 210C before contraction was observed. The contraction of the opals was ascribed to both sintering, supported by morphological change observed in the SEM micrographs, and dehydroxylation of the silanol groups producing silicon-oxygen-silicon bridges resulting in a more dense silica network.

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
1
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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