Effects of dopants on the synthesis of Pb(Mg_(1/3)Nb_(2/3))O_3-PbTiO_3 ceramics by the reaction-sintering method

摘要

Sintering aid-doped 0.8 Pb(Mg_(1/3)Nb_(2/3))O_3-PbTiO_3 (0.8PMN-0.2PF) relaxor-based ferroelectric ceramics were prepared by the reaction-sintering method. X-ray diffraction (XRD) measurement, SEM observation, and density measurement confirmed that the Li_2CO_3- and CuO-doped 0.8PMN-0.2PT ceramics exhibit pure rhombohedral perovskite structure, rather homogenous micromorphology and high relative density. As compared to the undoped 0.8PMN-0.2PT ceramics, the Li_2CO_3 and CuO-doped 0.8PMN-0.2PT ceramics exhibit enhanced dielectric diffused and frequency dispersion, improved ferroelectric property, and piezoelectric property, while as the sintering temperature is decreased greatly. Therefore, Li_2CO_3 and CuO are effective sintering aids for the PMN-PT ceramics prepared by the reaction-sintering method, which exhibit promising applications in the electronic ceramic industries.