@article{discovery59649,
       publisher = {ELSEVIER SCIENCE BV},
            note = {Text made available to UCL Discovery by kind permission of Elsevier B.V., 2012},
           pages = {245 -- 252},
         journal = {Journal of Nuclear Materials},
           month = {July},
          number = {2-3},
           title = {The electrical impedance of single-crystal urania at elevated temperatures},
            year = {1988},
          volume = {154},
        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 {\ensuremath{<}} 1300 K) and 1.4 eV (T {\ensuremath{>}} 1300 K). Results are used to estimate the ambipolar contribution to the thermal conductivity above 1500 K.},
             url = {http://dx.doi.org/10.1016/0022-3115(88)90360-1},
          author = {Hampton, RN and Saunders, GA and Stoneham, AM and Harding, JH},
            issn = {0022-3115}
}