The effect of heat treatment on crystal structure in zircon monitored by ESR and XRD
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Publication Details
Author list: Kittiauchawal T., Mungchamnankit A., Sujinnapram S., Kaewkhao J., Limsuwan P.
Publisher: Elsevier
Publication year: 2012
Volume number: 32
Start page: 706
End page: 713
Number of pages: 8
ISSN: 1877-7058
Languages: English-Great Britain (EN-GB)
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Abstract
X-band ESR spectra of zircon before and after heat treatment under oxygen rich atmosphere were measured with directions of the magnetic field applied in parallel and perpendicular to c-axis [001]. Seven peaks of Zeeman interaction were generated from the microwave energy absorptions due to the transitions between the spin states of natural impurity, gadolinium ions (Gd3+, S = 7/2). Angular variation of peak positions reflects that the symmetry surrounding of Gd3+ is D2d, signifying the replacement of Zr4+ by Gd3+ in the lattice. From XRD patterns, the unheated and after heated zircon are the same phase i.e. tetragonal phase of the space group I41/amd. The Rietveld refinement method was employed for derivation of the bond distance and bond angles of zirconium, silicon and oxygen atoms. ฉ 2010 Published by Elsevier Ltd.
Keywords
Rietveld Refinement, Zircon
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