Effect of Zn doping on dielectric properties of MgO nanoparticles synthesized by microwave-assisted combustion route

Abstract The composite insulating materials are major parts of various electrical devices because of their synergetic effect. The primary aim is to study the dielectric properties of nanoscale MgO and Zn-doped MgO nanoparticles (NPs). MgO and a series of (2, 4 and 6%) Zn-doped MgO NPs were synthesized by microwave-assisted combustion route. The samples were characterized through various techniques and the confirmation of phases and crystallite sizes of MgO and Zn-doped MgO NPs were calculated from XRD pattern. The study of dielectric permittivity, dielctric loss, AC conductivity and impedance were investigated in the frequency range of 1–106 Hz at room temperature. The dielectric permittivity and dielectric loss of the materials increased with increase in the doping of Zn into MgO NPs at lower frequency. The AC conductivity values of doped nanoparticles increased gradually with increase in the frequency range due to the hopping and tunneling mechanism. The real and imaginary impedance were found to decrease with increase in the Zn doping percentage.