Thermal Characteristics of Australian Sedimentary Opals

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Show simple item record Brown, Leslie en_US Ray, Abhi en_US Thomas, Paul en_US Guerbois, Jean-Pierre en_US 2009-06-26T04:10:48Z 2009-06-26T04:10:48Z 2002 en_US
dc.identifier 2004003571 en_US
dc.identifier.citation Brown Leslie et al. 2002, 'Thermal Characteristics of Australian Sedimentary Opals', Kluwer Academic Publishers, vol. 68, no. 1, pp. 31-36. en_US
dc.identifier.issn 1388-6150 en_US
dc.identifier.other C1UNSUBMIT en_US
dc.description.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. en_US
dc.publisher Kluwer Academic Publishers en_US
dc.title Thermal Characteristics of Australian Sedimentary Opals en_US
dc.parent Journal of Thermal Analysis and Calorimetry en_US
dc.journal.volume 68 en_US
dc.journal.number 1 en_US
dc.publocation Dordrecht, Netherlands en_US
dc.identifier.startpage 31 en_US
dc.identifier.endpage 36 en_US SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 030600 en_US
dc.personcode 95054538 en_US
dc.personcode 860311 en_US
dc.personcode 960405 en_US
dc.personcode 910825 en_US
dc.percentage 100 en_US Physical Chemistry (incl. Structural en_US
dc.classification.type FOR-08 en_US
dc.description.keywords amorphous silica, opal, TG, TMA en_US
dc.staffid 910825 en_US

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