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Compositions having the general formula Nil _,Zn,FezO4 with x = 0.30, 0.35, 0.40, 0.45 have been sintered at 1100, 1150, 1200, and 1240 "C to attain different microstructures. The grain size D for a particular composition increases linearly with increasing sintering temperature. The lattice parameter a and magnetization M, are seen to be invariant with the change in sintering temperature. The coercive force H, and the remanent ratio R = M,/M, are seen to depend on the sintering temperature and hence on D. a and M, are found to increase with the increase of the Zn content, whereas H, values show a decreasing trend with the Zn content. The compositional, thermal, and microstructural variation of hysteresis parameters like M,, H,, and R = M,/M, reveal that magnetic grains in the compositions investigated are of multi-domain type. This result is supported by ac susceptibility data.

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