Enhancement of electrical conductivity in MgO due to lithium impurities |
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| Authors: | Y. Chen R.H. Kernohan J.L. Boldu M.M. Abraham D.J. Eisenberg J.H. Crawford |
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| Affiliation: | Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, U.S.A.;University of North Carolina, Chapel Hill, North Carolina, U.S.A. |
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| Abstract: | The electrical conductivity of lithium-doped MgO crystals at room temperature is shown to be enhanced by the thermal creation of stable [Li]0 defects by oxidation at elevated temperatures. The current-voltage curves are found to be nonlinear at low voltages. The enhancement in conductivity is attributed to localized regions of high [Li]0 concentration in which the holes at the [Li]0 sites are thermally ionized into the valence band, causing these regions to be semiconducting. |
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