Electrical transport in magnesium aluminate

Mathews, Tom ; Jacob, K. T. ; Hajra, J. P. (1990) Electrical transport in magnesium aluminate Bulletin of Materials Science, 13 (4). pp. 293-300. ISSN 0250-4707

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Official URL: http://www.ias.ac.in/j_archive/bms/13/3/293-300/vi...

Related URL: http://dx.doi.org/10.1007/BF02744986


The conductivity of MgAl2O4 has been measured at 1273, 1473 and 1673 K as a function of the partial pressure of oxygen ranging from 105 to 10−14 Pa. The MgAl2O4 pellet, sandwiched between two platinum electrodes, was equilibrated with a flowing stream of either Ar + O2, CO + CO2 or Ar + H2 + H2O mixture of known composition. The gas mixture established a known oxygen partial pressure. All measurements were made at a frequency of 1 kHz. These measurements indicate pressure independent ionic conductivity in the range 1 to 10−14 Pa at 1273 K, 10−1 to 10−12 Pa at 1473 K and 10−1 to 10−4 Pa at 1673 K. The activation energy for ionic conduction is 1·48 eV, close to that for self-diffusion of Mg2+ ion in MgAl2O4 calculated from the theoretical relation of Glyde. Using the model, the energy for cation vacancy formation and activation energy for migration are estimated.

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