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Nano crystalline Ni 0.5 Zn 0.5 Cr x Fe 2−x O 4 particles with x varying from 0.00 to 0.25 in steps of 0.05 have been synthesized through citrate gel autocombustion method. When Ni 0.5 Zn 0.5 Fe 2 O 4 nano particles were annealed at 1000 o C, the crystallite size increased while the lattice constant decreased slightly. For, the Cr 3+ substituted samples annealed at 1000 o C, the variation in lattice constant, bondlengths, M e -M e distances and other structural parameters have been attributed to the dissimilarity in the ionic radius of the displaced (Fe 3+ ) ion and the substituted (Cr 3+ ) ion. Thermal studies indicated the autocombustion process which is an exothermic reaction between the nitrates salt solutions and the citric acid took place at about a temperature of 400 o C for Ni 0.5 Zn 0.5 Fe 2 O 4 . The M-H loops for all samples indicated a soft ferrite nature for all samples. The non-saturated hysteresis loop and high coercivity for the as prepared Ni 0.5 Zn 0.5 Fe 2 O 4 nano particles has been attributed to the core-shell structure of the fine particles. When annealed at 1000 o C the saturation magnetization of Ni 0.5 Zn 0.5 Fe 2 O 4 nano particles increased and

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