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The pressure dependence of the dielectric constant and electrical conductivity of single crystal uranium dioxide

Hampton, RN; Saunders, GA; Harding, JH; Stoneham, AM; (1987) The pressure dependence of the dielectric constant and electrical conductivity of single crystal uranium dioxide. Journal of Nuclear Materials , 150 (1) 17 - 23. 10.1016/0022-3115(87)90089-4. Green open access

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Abstract

Complex impedance techniques, within the frequency range 10 Hz to 1 MHz, have been used to make high pressure studies of monocrystalline uranium dioxide at ambient temperature. These techniques have shown that for frequencies below 40 MHz the electrical properties of high pressure samples are dominated by a boundary layer. The impedance methods have enabled us to make the first determination of the pressure dependence of the static dielectric constant of uranium dioxide within the boundary layer. The experimental pressure dependence (−0.03 kbar−1) is in reasonable agreement with that calculated (−0.02 kbar−1) using standard interatomic potentials. We have also measured the conductivity in the boundary layer as a function of pressure (2.5 μS kbar−1). The pressure dependences of the conductivity and the dielectric constant have been used to obtain an estimate of the carrier binding and hopping energies, which have then been compared with values predicted using the shell model.

Type: Article
Title: The pressure dependence of the dielectric constant and electrical conductivity of single crystal uranium dioxide
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/0022-3115(87)90089-4
Publisher version: http://dx.doi.org/10.1016/0022-3115(87)90089-4
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/108814
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