Canadian Journal of Pure & Applied Sciences

Abstract: Mono-dispersed tin doped indium oxide (ITO) nanopowders were prepared by wet chemical co-precipitation method at 3000C for 3h with maintaining the In/Sn atomic ratio 90:10, 70:30 and 50: 50 wt.%. The grain size of the prepared samples was determined by TEM technique. Structural characterization of the prepared samples was studied by X-ray diffraction analysis. It is found that the samples were a mixture of cubic and rhombohedra crystals with sharp diffraction peaks except for the sample with atomic ratio 50:50 shows very poor crystalline and no peaks ascribed to the phase of the compounds are observed which confirms the amorphicity of this sample. The dielectric properties including dielectric constant, ? and dielectric loss, ?`` of the prepared samples were evaluated from the observed capacitance values in the frequency range 100 Hz to 5 MHz and in the temperature range of 25 0C to 1600C. Further, from the dielectric properties studies AC- conductivity was evaluated. The activation enthalpy ?H and the entropy change ?S of the prepared samples were calculated. The obtained data were correlated to the structure of the prepared samples