Influence of Mn+Y co-doped on the intrinsic pyroelectricproperties of Ba0.67Sr0.33TiO3 ceramics

摘要

Mn+Y co-doped Ba0.67Sr0.33TiO3 (BST) powders were fabricated by a citrate precursor method. Mn+Y:BST ceramics were prepared by conventional electronic ceramic process. The microstructure and intrinsic pyroelectric properties of the obtained Mn+Y:BST ceramics were investigated. Adopting fine Mn+Y doped BST powders derived from the citrate method was confirmed to be effective in reducing the sintering temperature required for densification. The ceramic specimens sintered at 1250–1300 °C presented relative densities of around 96%. The ceramics sintered at 1280 °C for 3 h attained superior dielectric and pyroelectric properties, giving a dielectric constant εr = 2850, dielectric loss tan δ = 0.0137, remnant polarization Pr = 7.3 µC/cm², intrinsic pyroelectric coefficient γint = 570 nC/cm² K, and the maximum figure of merit of detectivity FD =88.1 µPa^−1/2 at 1 kHz, respectively.