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The dielectric behaviour of single-crystal MgO,Fe/MgO and Cr/MgO
Authors:J. S. Thorp  N. Enayati-Rad
Affiliation:(1) Department of Applied Physics and Electronics, University of Durham, Durham, UK
Abstract:The dielectric constantsepsiprime and loss factors,epsiPrime, for pure single-crystal MgO and for Fe-and Cr-doped crystals have been measured at frequencies, ohgr, from 500 Hz to 500 kHz at room temperature. For pure MgO at 1 kHz the values ofepsiprime and the loss tangent, tan delta, (9.62 and 2.16×10–3, respectively) agree well with the data of Von Hippel; the conductivity, sgr, varies as sgr infin ohgrn withn=0.98±0.02. In Fe-doped crystals sgr increases with Fe-concentration (at any given frequency); for a crystal doped with 12800 ppm Fe, sgr was about four times the value for pure MgO. At all concentrations the variation of log sgr with log ohgr was linear andn=0.98±0.02. A decrease inepsiprime with increasing Fe-concentration was also observed. A similar, although less pronounced, behaviour was found in Cr-doped crystals. The effects are discussed in terms of hopping mechanisms.
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