Preparation and Study of (1-m)(Mg_(0.8)Zn_(0.2))TiO_3-m{Ba_4Nd_(28/3)Ti_(18)O_54)-0.18Bi_2O_3} Microwave Dielectric Ceramics

摘要

In this work, the microwave dielectric ceramic (l-m)(Mg_(0.8)Zn_(0.2)) TiO_3-m{Ba_4Nd_(28/3)Ti_(18)O_(54))-0.18Bi_2O_3}(m=0.1~0.4)(MZT-BNT) was studied to improve dielectric properties. The results of the dielectric properties, density, XRD and SEM show that the value of m and the sintering temperature affected the structure and properties of the ceramics. MZT-BNT composite system is a two-phase composite system. With the adding of BNT, the dielectric properties of MZT increase significantly. As m value increases, the bulk density and the dielectric constant of the composite system increase, while the quality factor reduces and the temperature coefficient of resonant frequency is close to zero. The dielectric properties of MZT-BNT sintered at 1200 °C (m = 0.3) are er= 34.03, Qt= 7177 GHz, rf = -3.39 ppm/°C, respectively.