Thermal properties of gem-quality moganite-rich blue chalcedony

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dc.contributor.authorHatipoǧlu M.
dc.contributor.authorTuncer Y.
dc.contributor.authorKibar R.
dc.contributor.authorÇetin A.
dc.contributor.authorKaral T.
dc.contributor.authorCan N.
dc.date.accessioned2024-07-22T08:20:33Z
dc.date.available2024-07-22T08:20:33Z
dc.date.issued2010
dc.description.abstractIn this study, thermal properties and thermal decompositions of dehydration behaviour of gem-quality translucent blue chalcedonies, without banding or crystalline centre structure, from the Sarcakaya-Eskiehir region in Turkey were studied by means of X-ray diffraction (XRD), inductively coupled plasma-atomic emission spectrometry (ICP-AES), Fourier transform infrared (FT-IR), thermoluminescence (TL), and simultaneously two thermal analyses of (DTA/TGA) spectroscopy. X-ray diffraction patterns of the blue chalcedony indicate the presence of two important chalcedonic silica phases with overlapped peaks at 4.26, 3.34, 2.28, 2.13, 1.82, 1.54, 1.38, and 137 . During heating from the room temperature to 300 °C, the thermoluminescence pattern of the blue chalcedony shows a characteristic peak at 210 °C. This peak may be due to unusually high traces of the impurities S, Th, Tl, U, and W. During heating from the room temperature to 1400 °C, the TGA pattern of the blue chalcedony indicates that the weight loss is due to the silanol water loss only, and that this loss occurs in a wide temperature range between about 170 and 954 °C. In addition, after making some corrections concerning the artefact mass gain, being due to the drift with buoyancy effect of the atmosphere in its TGA curve, the moganite-rich blue chalcedony shows a relatively lower mass loss of 0.202%. The DTA pattern of the blue chalcedony displays both endothermic and exothermic behaviours because of silica phase transformations. There are one distinctive sharp endotherm and three weaker endotherms at 806 °C. In addition, there is one distinctive sharp exotherm and one weaker exotherm at 1270 °C. © 2010 Elsevier B.V. All rights reserved.
dc.identifier.DOI-ID10.1016/j.physb.2010.08.048
dc.identifier.issn09214526
dc.identifier.urihttp://akademikarsiv.cbu.edu.tr:4000/handle/123456789/18206
dc.language.isoEnglish
dc.subjectAtomic emission spectroscopy
dc.subjectAtomic spectroscopy
dc.subjectBuoyancy
dc.subjectDecomposition
dc.subjectDiffraction
dc.subjectElectromagnetic induction
dc.subjectFourier transforms
dc.subjectGems
dc.subjectHeating
dc.subjectHolographic interferometry
dc.subjectInductively coupled plasma
dc.subjectPhase transitions
dc.subjectSilica
dc.subjectThermoanalysis
dc.subjectThermodynamic properties
dc.subjectX ray diffraction
dc.subjectX ray diffraction analysis
dc.subjectBuoyancy effect
dc.subjectCharacteristic peaks
dc.subjectDehydratial behaviours
dc.subjectExotherms
dc.subjectFourier transform infrared
dc.subjectInductively coupled plasma-atomic emission spectrometry
dc.subjectMass gain
dc.subjectMass loss
dc.subjectMoganite-rich gem quality blue chalcedony
dc.subjectOverlapped peaks
dc.subjectPhase transformation
dc.subjectRoom temperature
dc.subjectSilanols
dc.subjectSilica phasis
dc.subjectTemperature range
dc.subjectTGA curves
dc.subjectThermal analysis
dc.subjectThermal decompositions
dc.subjectThermal properties
dc.subjectTurkey
dc.subjectWater loss
dc.subjectWeight loss
dc.subjectXRD
dc.subjectThermoluminescence
dc.titleThermal properties of gem-quality moganite-rich blue chalcedony
dc.typeArticle

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