Microwave sintering of dielectric CaCu3Ti4O12: An interfacial conductance and dipole relaxation effect

► Effect of microwave sintering on dielectric properties of CaCu3Ti4O12 was studied. ► Grain and grain boundary dipole relaxation time due to sintering were investigated. ► Beyond 1075 °C, dielectric properties degrade. ► Effect of frequency on conductivity is investigated.