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The dielectric constant of UO2 below the Néel point

Hampton, N; Saunders, GA; Harding, JH; Stoneham, AM; (1987) The dielectric constant of UO2 below the Néel point. Journal of Nuclear Materials , 149 (1) 18 - 20. 10.1016/0022-3115(87)90493-4. Green open access

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Abstract

We report measurements of the frequency-dependent dielectric constant of UO2 from 4.2 K to above the phase transition at 30 K. The static dielectric constant of 23.6 at 4.2 K is comparable with accepted values at higher temperatures: it is essentially identical in both phases. The effects of undergoing the transition on the dielectric constant are marginal (about 1%) and take place in the temperature range 29 K to 37 K. The displacement of the oxygen sublattice, which occurs at the Ne´el point, should produce only a 0.05% change on the dielectric constant and of the opposite sense to that measured. Hence the structural changes at the transition are not the primary source of the observed small difference between the dielectric constant in the two phases which probably accrues from the influence of the displacements on a defect-related contribution.

Type: Article
Title: The dielectric constant of UO2 below the Néel point
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/0022-3115(87)90493-4
Publisher version: http://dx.doi.org/10.1016/0022-3115(87)90493-4
Language: English
Additional information: Text made available to UCL Discovery by kind permission of Elsevier B.V., 2012
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/59662
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