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The electrical impedance of single-crystal urania at elevated temperatures

Hampton, RN; Saunders, GA; Stoneham, AM; Harding, JH; (1988) The electrical impedance of single-crystal urania at elevated temperatures. Journal of Nuclear Materials , 154 (2-3) 245 - 252. 10.1016/0022-3115(88)90360-1. Green open access

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Abstract

The electrical admittance of single-crystal urania has been measured from 300 to 1500 K, over a frequency range of 10 Hz to 10 MHz, using complex impedance spectroscopy. The data have been analyzed using a simple equivalent circuit of a parallel element comprising a conductance and a capacitance connected in series with a separate capacitance. The simple equivalent circuit also reanalyzes successfully the frequency dependence of the electrical conductivity found by Bates and his co-workers, giving results consistent with the present work. The conductance data show a distinct “kink” at about 1300 K, which is in good agreement with previous work, as are the activation energies: 0.12 eV (T < 1300 K) and 1.4 eV (T > 1300 K). Results are used to estimate the ambipolar contribution to the thermal conductivity above 1500 K.

Type: Article
Title: The electrical impedance of single-crystal urania at elevated temperatures
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/0022-3115(88)90360-1
Publisher version: http://dx.doi.org/10.1016/0022-3115(88)90360-1
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/59649
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