Nanoparticles Ni_0.55Zn_0.45Fe₂O₄ was synthesized at low temperature using novel precursor method. The single spinel phase crystallization of sample was confirmed using XRD and IR spectra. Nanosize particles were confirmed using XRD and TEM images. Isomer shift in Mossbauer spectral studies are consistent with Fe ions in trivalent state. DC resistivity was of the order of 10⁸ ohm cm that is two orders higher than those reported for NiZn ferrites prepared by conventional ceramic method. The high resistivity was attributed to nanosize particles, absence of Fe+² ions and method of preparation.