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

Mn+Y co-doped Ba
_0.67
Sr
_0.33
TiO
₃
(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 ε
_r
= 2850, dielectric loss tan δ = 0.0137, remnant polarization P
_r
= 7.3 μC/cm
²
, intrinsic pyroelectric coefficient γ
_int
= 570 nC/cm
²
K, and the maximum figure of merit of detectivity F
_D
=88.1 μPa
^-1/2
at 1 kHz, respectively.