Dielectric Properties of Li<sub>2</sub>CO<sub>3</sub> Doped Nio Measured at High Frequency

Abstract

NiO-based ceramic has shown high dielectric constant with 103-105, as well as high dielectric loss. Previous studies showed that doping with monovalent cations can cause a considerable decrease in dielectric loss. In this research, the effect of Lithium carbonate (Li2CO3) dopant on NiO was investigated. The electroceramic of LixNi1-xO were prepared by using solid state reaction method. The mixture of Li+ and NiO were ball milled for 24 hours. The samples were calcined at 800oC for 6 hours, pressed into pellet shape at 750 MPa and sintered at 1200°C for 10 hours. The sintered pellets were subjected to XRD, SEM, density testing and Impedance analyzer. XRD result shows the single phase formation of LixNi1-xO. The grain becomes larger with the increament of Li+ mole %. The dielectric constant of LixNi1-xO decrease with the increasing frequency. The highest dielectric constant was observed in x= 0.03 with 5210 at frequency range of 1GHz to 1MHz.