Enhanced antiferroelectric and electric-induced pyroelectric properties of Mn-substitued (Pb_(0.832)Ba_(0.138)La_(0.O2)(Zr_(0.7)Ti_(0.05)Sn_(0.25)O_3 ceramics

摘要

(Pb_(0.832)Ba_(0.138)La_(0.02))(Zr_(0.7)Ti_(0.05)Sn_(0.25))O_3 ceramics with stable antiferroelectric phase at room temperature were fabricated by Mn doping. The enhancement of antiferroelectric phase is attributed that the substitution of Mn ion into the B site decreased tolerance factor of the ceramics. The largest pyroelectric figure of merit of 25 × 10~(-5)Pa~(-0.5) was obtained in (Pb_(0.832)Ba_(0.138)La_(0.02))(Zr_(0.7)Ti_(0.05)Sn_(0.25))O_3 antiferroelectric ceramics with 0.2 mol. % Mn doping, which is far higher than that of convention phase transition materials. The increase of the pyroelectric response was attributed to the improvement in dc field-induced dielectric enhancement effect and the reduction in dielectric loss.