TMA and SEM characterization of the thermal dehydration of australian sedimentary opal

Smallwood, A; Thomas, PS; Ray, AS; Šimon, P

TMA and SEM characterization of the thermal dehydration of australian sedimentary opal

Smallwood, A Thomas, PS

Ray, AS Šimon, P

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Publication Type:: Journal Article
Citation:: Journal of Thermal Analysis and Calorimetry, 2007, 88 (1), pp. 185 - 188
Issue Date:: 2007-04-01

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Field	Value	Language
dc.contributor.author	Smallwood, A	en_US
dc.contributor.author	Thomas, PS https://orcid.org/0000-0001-6962-2121	en_US
dc.contributor.author	Ray, AS	en_US
dc.contributor.author	Šimon, P	en_US
dc.date.issued	2007-04-01	en_US
dc.identifier.citation	Journal of Thermal Analysis and Calorimetry, 2007, 88 (1), pp. 185 - 188	en_US
dc.identifier.issn	1388-6150	en_US
dc.identifier.uri	http://hdl.handle.net/10453/612
dc.description.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 200°C 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 210°C 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. © Springer-Verlag 2007.	en_US
dc.relation.ispartof	Journal of Thermal Analysis and Calorimetry	en_US
dc.relation.isbasedon	10.1007/s10973-006-8136-7	en_US
dc.subject.classification	Physical Chemistry	en_US
dc.title	TMA and SEM characterization of the thermal dehydration of australian sedimentary opal	en_US
dc.type	Journal Article
utslib.citation.volume	1	en_US
utslib.citation.volume	88	en_US
utslib.for	0306 Physical Chemistry (incl. Structural)	en_US
utslib.for	0303 Macromolecular and Materials Chemistry	en_US
utslib.for	0399 Other Chemical Sciences	en_US
dc.location.activity	ISI:000245649300033	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney/Strength - CBI - Centre for Built Infrastructure
utslib.copyright.status	closed_access
pubs.issue	1	en_US
pubs.publication-status	Published	en_US
pubs.volume	88	en_US

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 200°C 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 210°C 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. © Springer-Verlag 2007.

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http://hdl.handle.net/10453/612