A spinel CoMnAlO4 has been synthesised by the oxide method. It has a tetragonal structure withA=8.10 A andC=8.22 A. A break is found in the plot of logρ against 1/T at 573°K when activation energy changes from 0.62 eV to 0·52 eV. The electrical properties show that it can be regarded as a properly substituted CoMn2O4 by Al+3 ions. It is paramagnetic withCM = 4.72 and ϑa= −298°K. These results show the ionic configuration of the compound as Co+2 [Mn+3 Al+3]O4.
Volume 42 | Issue 6
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