Study of (1 − x)(Mg 0.6Zn 0.4) 0.95Co 0.05TiO 3– xCa 0.61Nd 0.26TiO 3 microwave dielectrics

Abstract

The microwave dielectric properties and the microstructures of the (1 − x)(Mg 0.6Zn 0.4) 0.95Co 0.05TiO 3– xCa 0.61Nd 0.26TiO 3 ceramic system were investigated. In order to achieve a temperature-stable material, we studied a method of combining a positive temperature coefficient material with a negative one. Ca 0.61Nd 0.26TiO 3 has a large positive temperature coefficient of resonant frequency. (Mg 0.6Zn 0.4) 0.95Co 0.05TiO 3 possesses a negative temperature coefficient of resonant frequency. By appropriately adjusting the x value in the (1 − x)(Mg 0.6Zn 0.4) 0.95Co 0.05TiO 3– xCa 0.61Nd 0.26TiO 3 ceramic system, a near-zero τ f value can be obtained. A new microwave dielectric material of 0.8(Mg 0.6Zn 0.4) 0.95Co 0.05TiO 3–0.2Ca 0.61Nd 0.26TiO 3 possesses the excellent dielectric properties of a dielectric constant of 28.6, a Q × f value of 80,600 GHz and a temperature coefficient of resonant frequency of 4.1 ppm/°C and has a lower sintering temperature of 1250 °C.