Tschauner, O. and Ma, C. and Grubor-Urosevic, O. and Chen, Y. J. (2013) Anomalous bulk compression behaviour in a hyperstoichiometric uranium-dioxide–thorium-dioxide solid solution. Journal of Physics: Condensed Matter, 25 (16). Art. No. 162201. ISSN 0953-8984. doi:10.1088/0953-8984/25/16/162201. https://resolver.caltech.edu/CaltechAUTHORS:20130506-075703562
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Abstract
The compression behaviour of a solid solution of ThO_2 and hyperstoichiometric UO_2 was examined up to 11 GPa hydrostatic pressure using x-ray diffraction. We observed a distortive phase transition above 3 GPa from fluorite-type to a structure isotypic with t-zirconia. The transition is tentatively explained by merging of local tetragonal UO_(2+δ) clusters into an itinerant structural distortion. The bulk modulus increases from 162 ± 1 to 199 ± 4 GPa in the tetragonal phase by stiffening of the c-axis compression.
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| Additional Information: | © 2013 Institute of Physics Publishing Ltd. Received 10 December 2012, in final form 19 February 2013. Published 18 March 2013. This research was supported by NNSA Cooperative Agreement DE-FC88-01NV14049. CHESS is supported by the NSF and NIH/NIGMS via NSF award DMR-0936384. We acknowledge support by P Sorensen and Z Wang at CHESS. The SEM and EPMA analyses were carried out at the Caltech GPS Division Analytical Facility, which is supported, in part, by NSF Grants EAR-0318518 and DMR-0080065. | ||||||||||||||
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| Issue or Number: | 16 | ||||||||||||||
| Classification Code: | PACS: 62.20.F-, 62.20.D-, 81.40.Lm, 64.70.K-, 81.40.Jj, 61.50.Nw | ||||||||||||||
| DOI: | 10.1088/0953-8984/25/16/162201 | ||||||||||||||
| Record Number: | CaltechAUTHORS:20130506-075703562 | ||||||||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20130506-075703562 | ||||||||||||||
| Official Citation: | Anomalous bulk compression behaviour in a hyperstoichiometric uranium-dioxide–thorium-dioxide solid solution O Tschauner et al 2013 J. Phys.: Condens. Matter 25 162201 | ||||||||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||
| ID Code: | 38279 | ||||||||||||||
| Collection: | CaltechAUTHORS | ||||||||||||||
| Deposited By: | Ruth Sustaita | ||||||||||||||
| Deposited On: | 06 May 2013 15:18 | ||||||||||||||
| Last Modified: | 09 Nov 2021 23:36 |
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