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A comparative studies on anomalous behaviour at Curie point between clay additives Mn-Zn ferrites and other mixed ferrites such as Mn-Zn, Ni-Zn, Mg-Mn and Ni-Mg have been carried out in this investigation. The changes in T c on compositions, additives and manufacturing processes of such soft mixed ferrites have been determined from the temperature dependent dc resistivity data and the log ρ vs. (1/1000T) graphs. It is observed that the Curie temperature is dependent on compositions, additives, manufacturing process and microstructure. Definite changes of Curie points of clay additives Mn-Zn ferrites with other ferrites were observed. Both the Mn-Zn ferrites and clay additives Mn-Zn ferrites showed some changes in their T sub>c behavior. The T sub>c value of Mn-Zn ferrites with clay additives decreases with increasing additives. In the case of clay substituted Mn-Zn ferrites the decrease of Curie point can be understood by a decrease of the number of Fe 3+ magnetic ions substituted by nonmagnetic Al 3+ ions on O sites of the system.   Bangladesh J. Sci. Ind. Res. 41 (3-4), 171-180, 2006

Studies on Anomalous Behaviour at Curie Point T<sub>c</sub> of Some Classes of Mixed Ferrites