The dielectric behaviour of single-crystal MgO,Fe/MgO and Cr/MgO |
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Authors: | J S Thorp N Enayati-Rad |
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Affiliation: | (1) Department of Applied Physics and Electronics, University of Durham, Durham, UK |
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Abstract: | The dielectric constants![epsi](/content/j1172g71132180x7/xxlarge949.gif) and loss factors,![epsi](/content/j1172g71132180x7/xxlarge949.gif) , for pure single-crystal MgO and for Fe-and Cr-doped crystals have been measured at frequencies, , from 500 Hz to 500 kHz at room temperature. For pure MgO at 1 kHz the values of![epsi](/content/j1172g71132180x7/xxlarge949.gif) and the loss tangent, tan , (9.62 and 2.16×10–3, respectively) agree well with the data of Von Hippel; the conductivity, , varies as
n
withn=0.98±0.02. In Fe-doped crystals increases with Fe-concentration (at any given frequency); for a crystal doped with 12800 ppm Fe, was about four times the value for pure MgO. At all concentrations the variation of log with log was linear andn=0.98±0.02. A decrease in![epsi](/content/j1172g71132180x7/xxlarge949.gif) 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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