Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 68: Issue 1
Thermal Characteristics of Australian Sedimentary Opals
Authors:
L. Brown University of Technology Department of Chemistry, Materials and Forensic Sciences, Faculty of Science P.O. Box 123 Broadway, Sydney NSW Australia 2007 P.O. Box 123 Broadway, Sydney NSW Australia 2007

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A. Ray University of Technology Department of Chemistry, Materials and Forensic Sciences, Faculty of Science P.O. Box 123 Broadway, Sydney NSW Australia 2007 P.O. Box 123 Broadway, Sydney NSW Australia 2007

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P. Thomas University of Technology Department of Chemistry, Materials and Forensic Sciences, Faculty of Science P.O. Box 123 Broadway, Sydney NSW Australia 2007 P.O. Box 123 Broadway, Sydney NSW Australia 2007

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J. Guerbois University of Technology Department of Chemistry, Materials and Forensic Sciences, Faculty of Science P.O. Box 123 Broadway, Sydney NSW Australia 2007 P.O. Box 123 Broadway, Sydney NSW Australia 2007

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Pages:
31–36
Online Publication Date:
02 Nov 2004
Publication Date:
01 Apr 2002
Article Category:
Research Article
DOI:
https://doi.org/10.1023/a:1014912331807
Keywords:
amorphous silica; opal; TG; TMA
Restricted access

Abstract  

Naturally occurring opals from three different regions in Australia were studied for their thermal characteristics. All the opals showed initial expansion followed by contraction in thermomechanical analysis (TMA) although the temperature at which the change from expansion to contraction occurred depended on their provenance. Thermogravimetric analysis (TG) revealed different rates and temperatures of dehydration for these opals. A general correlation between the temperature at which there was a zero thermal expansion and that of the maximum rate of dehydration was observed. A dehydration–sintering mechanism is proposed with the effect of sintering being more pronounced following total dehydration.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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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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