Mn- and Yb-Doped BaTiO3-(Na0.5Bi0.5)TiO3 Ferroelectric Relaxor with Low Dielectric Loss

In this work, a Mn-and Yb-doped BaTiO3-(Na0.5Bi0.5)TiO3 ferroelectric relaxor was designed and prepared. The effects of Mn on the microstructures, dielectric and electrical properties of the ceramics were investigated. The X-ray structural analysis shows a perovskite structure. The SEM images show the homogeneous microstructure of ceramics with an average grain size of about 1 mu m. The temperature-dependent permittivity shows relaxor characteristics as Mn-doped. Mn at a low level (x <= 0.005) is beneficial for low dielectric loss and high resistivity. The maximum resistivity of >= 3 x 10(12) ohm cm and minimum dielectric loss of <= 0.06 can be achieved at x <= 0.005. The resistivity of the ceramics follows the Arrhenius law with activation energy decreasing from similar to 1.31 to 1.01 eV as x increases. With lower Mn dopant, oxygen vacancies and charge carrier concentration partially decrease with Mn doping, which is helpful to improve the insulation resistance and decrease the dielectric loss.