Effect of particle size on electrical impedance, ac conductivity and dielectric properties of ZnSnO3 nanomaterial

In this work, we have reported the electrical impedance, frequency dependent ac conductivity and dielectric properties of zinc stannate (ZnSnO3) nanoparticles synthesized by facile co-precipitation method followed by ball milling for different time span to control particle size. Particle size shows decreasing nature upto a certain span of milling time (2 h) followed by an increase and opposite trend is reflected in band gap. Complex impedance analysis depicts presence of non-Debye type or multiple relaxations and depressed semicircles due to grain and grain boundary. Frequency dependent electrical conductivity analysis shows highest conductivity for two hour milled sample followed by a decrease beyond this. Both real and imaginary component of dielectric constant is also maximum for two hour milled sample.