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Investigation of the hydrothermal crystallisation of the perovskite solid solution NaCe1−xLaxTi2O6 and its defect chemistry
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Harunsani, Mohammad H., Woodward, David I., Peel, Martin D., Ashbrook, Sharon E. and Walton, Richard I. (2013) Investigation of the hydrothermal crystallisation of the perovskite solid solution NaCe1−xLaxTi2O6 and its defect chemistry. Journal of Solid State Chemistry, Volume 207 . pp. 117-125. doi:10.1016/j.jssc.2013.09.015 ISSN 0022-4596.
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Official URL: http://dx.doi.org/10.1016/j.jssc.2013.09.015
Abstract
Perovskites of nominal composition NaCe1−xLaxTi2O6 (0≤x≤1) crystallise directly under hydrothermal conditions at 240 °C. Raman spectroscopy shows distortion from the ideal cubic structure and Rietveld analysis of powder X-ray and neutron diffraction reveals that the materials represent a continuous series in rhombohedral space group R3̄c. Ce LIII-edge X-ray absorption near edge structure spectroscopy shows that while the majority of cerium is present as Ce3+ there is evidence for Ce4+. The paramagnetic Ce3+ affects the chemical shift and line width of 23Na MAS NMR spectra, which also show with no evidence for A-site ordering. 2H MAS NMR of samples prepared in D2O shows the inclusion of deuterium, which IR spectroscopy shows is most likely to be as D2O. The deuterium content is highest for the cerium-rich materials, consistent with oxidation of some cerium to Ce4+ to provide charge balance of A-site water.
Item Type: | Journal Article | ||||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||
Journal or Publication Title: | Journal of Solid State Chemistry | ||||||||||
Publisher: | Academic Press | ||||||||||
ISSN: | 0022-4596 | ||||||||||
Official Date: | November 2013 | ||||||||||
Dates: |
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Volume: | Volume 207 | ||||||||||
Page Range: | pp. 117-125 | ||||||||||
DOI: | 10.1016/j.jssc.2013.09.015 | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Access rights to Published version: | Restricted or Subscription Access |
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