Highly enhanced Qxf value of Ca_(0.61)Nd_(0.26)TiO3 ceramics with SnO2 additive

摘要

The microstructure and microwave dielectric properties of Ca_(0.61)Nd_(0.26)TiO3 + x mol SnO2 (0 ≤x ≤ 0.05) ceramics (CNTSx) were investigated by Field Emission Scanning Electron Microscope, Hakki-Coleman dielectric resonator, network analyser and X-ray Diffractometer. The XRD results indicated that all CNTSx samples were formed as orthorhombic-perovskite-structured CaTiO3 phase. There were second phase Ti_(0.7)Sn_(0.3)O2 in range of 0.02 ≤x≤ 0.05. The SnO2 additive promoted the grain size of CNT ceramic, which was conducive to the promotion of Q×f value. Although the εr value declined as contents of SnO2 increased, the SnO2 additive had a little of amelioration for τf value. Finally, the CNTS0.01 ceramic sintered at 1400 °C had stable comprehensive dielectric characteristic: εr ~ 105.2, Q×f ~ 14,369 GHz, τf ~+262.3 ppm/°C.