Effect of sintering temperature on microstructure and electrical properties of (Mn, Nb)-doped BZT-BCT ceramics

摘要

To obtain lead-free 0.5Ba(Zr_(0.2)Ti_(0.8))O_3-0.5(Ba_(0.7)Ca_(0.3))TiO_3 ceramics with excellent microstructure and electrical properties, BZT-BCT ceramics doping Mn~(4+) and Nb~(5+) was synthesized follow a conventional solid state reaction route. By means of SEM, XRD, quasi-static d_(33) meter, the influence of sintering temperature on microstructure, piezoelectric and dielectric properties of BZT-BCT-Mn-Nb ceramics was discussed. The results show that grain size and the dielectric loss of BZT-BCT-Mn-Nb ceramics increase as raising the sintering temperature. When BZT-BCT-Mn-Nb ceramics is sintered at 1380°C, the optimum piezoelectric coefficient and dielectric constant are 264pC/N and 4142, respectively.