Abstract
We report the structural, magnetic and electrical properties of new composition of spinel-type ZnNixCo2⿿xO4 (0.1x0.6) nano-particles. The X-ray diffraction and Fourier transform infrared spectroscopy studies reveal that the ZnNixCo2⿿xO4 nano-crystals show pure cubic spinal for all compositions wherein Co ions are systematically replaced by Ni ions. The electron microscopic studies reveal the nanoparticle sizes are of well-defined spherical shape and the magnetometry studies show superparamagnetic like behaviour with smaller values of coercive fields. The maximum dc conductivity at 30°C is found to be 0.03S/cm for ZnNi0.6Co1.4O4. Activation energies of dc conductivity obtained from Arrhenius plots are within the range of 0.12⿿0.35eV for extrinsic and 0.13⿿0.78eV for intrinsic regions and are affected by Ni concentration. Overall results suggest that these nano-particles are of high crystalline quality and electrical properties are dominated by holes as major charge carriers.
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