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

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Title: TMA and SEM characterization of the thermal dehydration of australian sedimentary opal.
Authors: Smallwood, A.1, Thomas, P. S.1 paul.thomas@uts.edu.au, Ray, A. S.1, Šimon, P.2
Source: Journal of Thermal Analysis & Calorimetry. Apr2007, Vol. 88 Issue 1, p185-188. 4p. 1 Diagram, 1 Chart, 1 Graph.
Subjects: Micrographics, Silica, Bone fractures, Opal glass, Glass etching, Thermal analysis, Coober Pedy (N.S.W.)
Geographic Terms: Australia
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. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Thermal Analysis & Calorimetry is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Thermal+Analysis+%26+Calorimetry%22">Journal of Thermal Analysis & Calorimetry</searchLink>. Apr2007, Vol. 88 Issue 1, p185-188. 4p. 1 Diagram, 1 Chart, 1 Graph.
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  Data: <searchLink fieldCode="DE" term="%22Micrographics%22">Micrographics</searchLink><br /><searchLink fieldCode="DE" term="%22Silica%22">Silica</searchLink><br /><searchLink fieldCode="DE" term="%22Bone+fractures%22">Bone fractures</searchLink><br /><searchLink fieldCode="DE" term="%22Opal+glass%22">Opal glass</searchLink><br /><searchLink fieldCode="DE" term="%22Glass+etching%22">Glass etching</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+analysis%22">Thermal analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Coober+Pedy+%28N%2ES%2EW%2E%29%22">Coober Pedy (N.S.W.)</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Australia%22">Australia</searchLink>
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  Data: 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. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Journal of Thermal Analysis & Calorimetry is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s10973-006-8136-7
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      – Code: eng
        Text: English
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        PageCount: 4
        StartPage: 185
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      – SubjectFull: Micrographics
        Type: general
      – SubjectFull: Silica
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      – SubjectFull: Bone fractures
        Type: general
      – SubjectFull: Opal glass
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      – SubjectFull: Glass etching
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      – SubjectFull: Thermal analysis
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      – SubjectFull: Coober Pedy (N.S.W.)
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      – SubjectFull: Australia
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      – TitleFull: TMA and SEM characterization of the thermal dehydration of australian sedimentary opal.
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              Text: Apr2007
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