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Anomalous bulk compression behaviour in a hyperstoichiometric uranium-dioxide–thorium-dioxide solid solution

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0953-8984/25/16/162201DOIUNSPECIFIED
http://iopscience.iop.org/0953-8984/25/16/162201PublisherUNSPECIFIED
ORCID:
AuthorORCID
Tschauner, O.0000-0003-3364-8906
Ma, C.0000-0002-1828-7033
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.
Funders:
Funding AgencyGrant Number
NNSA Cooperative AgreementDE-FC88-01NV14049
NSFUNSPECIFIED
NIH/NIGMSUNSPECIFIED
NSFDMR-0936384
NSFEAR-0318518
NSFDMR-0080065
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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