Tunable microwave dielectric properties of ca0.6la0.8/3tio3 and ca0.8sm0.4/3tio3-modified (mg0.6zn0.4)0.95ni0.05tio3 ceramics with a near-zero temperature coefficient

The microstructures and microwave dielectric properties of (Mg0.6Zn0.4 )0.95Ni0.05TiO3 with Ca0.6La0.8/3TiO3 and Ca0.8Sm0.4/3TiO3 additions prepared by the solid-state method has been investigated. The crystallization and microstructures of these two mixed dielectrics were checked by XRD, EDX, BEI, and SEM to demonstrate two phase systems. Furthermore, the tunable dielectric properties can be achieved by adjusting the amounts of Ca0.6La0.8/3TiO3 and Ca0.8Sm0.4/3TiO3 additions, respectively. After optimization of processed parameters, a new dielectric material system 0.88(Mg0.6Zn0.4 )0.95Ni0.05TiO3-0.12Ca0.6La0.8/3TiO3 possesses a permittivity (εr ) of 24.7, a Qf value of 106,000 (GHz), and a τf value of 3.8 (ppm/◦C), with sintering temperature at 1225◦C for 4 h. This dielectric system with a near-zero temperature coefficient and appropriate microwave properties revealed a high potential for high-quality substrates adopted in wireless communication devices.