Thermal properties of Australian sedimentary opals and Czech moldavites
Identifieur interne : 007447 ( Main/Exploration ); précédent : 007446; suivant : 007448Thermal properties of Australian sedimentary opals and Czech moldavites
Auteurs : P. S. Thomas [Australie] ; J. Sestak [République tchèque] ; K. Heide [Allemagne] ; E. Fueglein [Allemagne] ; P. Simon [Slovaquie]Source :
- Journal of thermal analysis and calorimetry [ 1388-6150 ] ; 2010.
Descripteurs français
- Pascal (Inist)
- Wicri :
- geographic : Australie, République tchèque.
English descriptors
- KwdEn :
Abstract
The thermal properties are presented for a precious opal sourced from Coober Pedy, South Australia and a moldavite from Bohemia, Czech Republic whose origins differ significantly as opal is derived from the slow isothermal diagenesis of silica, while the tektites are specimens of vitreous silica formed from the terrestrial impact of asteroids. The differences between the two glassy silicates are presented through measurement of the TG-DSC, TMA and high-vacuum-hot-extraction DEGAS analysis.
Affiliations:
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Le document en format XML
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<term>Australia</term>
<term>Coupled method</term>
<term>Czech Republic</term>
<term>Differential scanning calorimetry</term>
<term>Evolved gas analysis</term>
<term>Gas analysis</term>
<term>Gas release</term>
<term>Moldavite</term>
<term>Opal</term>
<term>Silica</term>
<term>Thermal analysis</term>
<term>Thermal properties</term>
<term>Thermogravimetry</term>
<term>Thermomechanical analysis</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Propriété thermique</term>
<term>Opale</term>
<term>Etat amorphe</term>
<term>Silice</term>
<term>Calorimétrie différentielle balayage</term>
<term>Thermogravimétrie</term>
<term>Méthode couplée</term>
<term>Analyse thermomécanique</term>
<term>Moldavite</term>
<term>Australie</term>
<term>République tchèque</term>
<term>Analyse thermique</term>
<term>Analyse gaz</term>
<term>Dégagement gazeux</term>
<term>Analyse gaz dégagé</term>
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<front><div type="abstract" xml:lang="en">The thermal properties are presented for a precious opal sourced from Coober Pedy, South Australia and a moldavite from Bohemia, Czech Republic whose origins differ significantly as opal is derived from the slow isothermal diagenesis of silica, while the tektites are specimens of vitreous silica formed from the terrestrial impact of asteroids. The differences between the two glassy silicates are presented through measurement of the TG-DSC, TMA and high-vacuum-hot-extraction DEGAS analysis.</div>
</front>
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