Modification of (Zr0.8Sn0.2)TiO4 high-frequency dielectric ceramics doped with CuO-TiO2

The influence of three different molar ratio of CuO-TiO 2 additives (1:1, 1:2 and 2:1) on sintering temperature and high-frequency properties of (Zr 0.8 Sn 0.2 )TiO 4 (ZST) ceramics prepared via a conventional solid-stated reaction method were investigated. In this paper, the phase composition, microstructures, densification and high-frequency properties were comprehensively studied. The CuO-TiO 2 dopant with low eutectic point generated liquid phase during the sintering of ZST ceramics, which promoted the densification process of the ceramics without changing the basic crystal structure. Compared with pure phase ZST ceramics, the CuO-TiO 2 doping can reduce the sintering temperature and coordinate the dielectric properties simultaneously. With the increase of CuO content, the amount of liquid phase formed during the sintering process was directly affected and further affected the microstructure and properties of ceramics. Results showed that the optimal dielectric ceramics adding 2 wt% CT sintering aid with comprehensive performance (1 MHz) of ε r = 42.52, tanδ = 1.1 × 10 − 5 , ρ R = 97.8% at 1250 °C were obtained.