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Thermal expansion of anatase and rutile between 300 and 575 K using synchrotron powder X-ray diffraction

Published online by Cambridge University Press:  01 March 2012

D. R. Hummer ,
P. J. Heaney  and
J. E. Post
D. R. Hummer
Affiliation:
Department of Geosciences, The Pennsylvania State University, University Park, Pennsylvania 16082
P. J. Heaney
Affiliation:
Department of Geosciences, The Pennsylvania State University, University Park, Pennsylvania 16082
J. E. Post
Affiliation:
Department of Mineral Sciences, Smithsonian Institution, Washington, DC 20560-0119
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Abstract

High-precision unit-cell parameters for the TiO2 polymorphs anatase and rutile at temperatures between 300 and 575 K have been determined using Rietveld analysis of synchrotron powder XRD data. Polynomial models were used to express the tetragonal unit-cell parameters as a function of absolute temperature, with a (anatase)=1.759 37×10−8×T2+6.418 16×10−6×T+3.779 84, c (anatase)=6.6545×10−8×T2+4.0464×10−5×T+9.4910, V (anatase)=2.237 58×10−6×T2+1.027 77×10−3×T+135.602, a (rutile)=−6.636 42×10−11×T3+1.005 01×10−7×T2−1.009 9310−5×T+4.586 34, c (rutile)=−4.115 50×10−11×T3+6.405 94×10−8×T2+4.675 61×10−7T+2.951 81, and V (rutile)=−2.7790×10−9×T3+4.2386×10−6×T2−3.3551×10−4×T+62.100. The polynomial expressions were used to calculate linear (α) and volume (β) thermal expansion coefficients of anatase and rutile between 300 and 575 K. At 298.15 K, these values were αa=4.46943×10−6 K−1, αc=8.4283×10−6 K−1, and β=17.3542×10−6 K−1 for anatase, and αa=6.99953×10−6 K−1, αc=9.36625×10−6 K−1, and β=28.680×10−6 K−1 for rutile.

Keywords

anataserutilethermal expansionsynchrotronpowder diffraction
Type
Technical Articles
Information
Powder Diffraction , Volume 22 , Issue 4 , December 2007 , pp. 352 - 357
Copyright
Copyright © Cambridge University Press 2007

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