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.

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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.

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