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.
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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 UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/59649 |
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