Study on intrinsic pyroelectric property of Mn doped BST ceramics

Mn-doped BST ceramics were prepared by citric acid sol-gel method.Using this method,the sintering temperature of BST-based ceramics could be decrease to 1250℃.The obvious degradation of ferroelectric property of BST-based ceramics was found as Mn bringing in however,with proper content of Mn doping,favor dielectric constant,low dielectric loss,favor pyroelectric property and figure of merit of BST-based ceramics were obtained at room temperature.The intrinsic pyroelectric coefficient γint of 1% Mn-doped BST ceramics reaches 610nC/(cm2·K),and the figure of merit Fd of 1% Mn-doped BST ceramics measured at low frequency was 88.4×10-6Pa-1/2,which can completely meet the need of pyroelectric detectors.In addition,the mechanism of domain switching was discussed during the study.