Electrical transport in magnesium aluminate
Data(s) |
01/09/1990
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Resumo |
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. |
Formato |
application/pdf |
Identificador |
http://eprints.iisc.ernet.in/35130/1/Alumni.pdf Mathews, Tom and Jacob, KT and Hajra, JP (1990) Electrical transport in magnesium aluminate. In: Bulletin of Materials Science, 13 (4). pp. 293-300. |
Publicador |
Indian Academy of Sciences |
Relação |
http://www.springerlink.com/content/1876l2414q366712/ http://eprints.iisc.ernet.in/35130/ |
Palavras-Chave | #Materials Engineering (formerly Metallurgy) |
Tipo |
Journal Article PeerReviewed |