Fe and Mg solubility in the Ca site of zirconolite, CaZrTi2O7
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Date
2004-02-04
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Publisher
Australian Institute of Physics
Abstract
The solid solubility of Fe in the Ca site of zirconolite appears to be approximately the same
whether it is incorporated as the divalent or trivalent species. Divalent Fe was encouraged by
using an argon firing atmosphere and direct substitution in the Ca site [Ca(1-x)FexZrTi2O7] and
trivalent Fe by the use of an air atmosphere and Al compensation in the Ti site
[Ca(1-x)FexZrTi(2-x)AlxO7]. The anticipated valences were confirmed by X-ray near-edge, Xray
photoelectron and Mossbauer spectroscopies. Changing the firing atmosphere from argon
to air and vice versa also changed the Fe valences, but scanning electron microscopy showed
that small amounts of second phase, Fe-bearing materials were present. The possible reasons
for the apparently similar solid solubilities of divalent and trivalent Fe in the Ca site are
discussed.
Solid state magic-angle nuclear magnetic resonance was used to study Mg speciation in the
Ca and Ti sites of zirconolite.
Description
Keywords
Iron, Magnesium, Zirconolite, Calcium, Argon, Atmospheres, Photoelectron spectroscopy, Valence, Nuclear magnetic resonance
Citation
Vance, E. R., Cashion, J. G., Hanna, J. V., Garrett, Z., & Bhati, M. (2004). Fe and Mg solubility in the Ca site of zirconolite, CaZrTi2O7. Poster presented to the 28th Annual Condensed Matter and Materials Meeting, Charles Sturt University, Wagga Wagga, 3-6 February 2004. Retrieved from: https://www.physics.org.au/wp-content/uploads/cmm/2004/04handbook.pdf