Ferroelectric and pyroelectric properties of Mn-doped lead zirconate titanate ceramics.

PbNb 0.02 (Zr 0.95 Ti 0.05 ) 0.98 O 3 (PNZT95/5) ceramics with Mn doping were prepared and the effects of Mn doping on the phase structure and electrical properties were investigated. It was found that Mn addition did not cause a remarkable change in rhombohedral perovskite structure, but significantly altered ferroelectric and pyroelectric properties of the PNZT95/5 ceramics. PNZT95/5 ceramics usually possessed a normal single hysteresis loop character when no aging process was employed, whereas Mn doped PNZT95/5 (PNMZT95/5) ceramics exhibited a double-hysteresis-like loop character because of the defect dipoles formed by Mn 2+ and O 2− vacancies. Meanwhile, ferroelectric features such as the polarization and coercive field showed a strong frequency and temperature dependence. Furthermore, Mn substitution resulted in the weakened dielectric property and enhanced pyroelectric property of the ceramics. The relevant pyroelectric coefficient ( p ) and detectivity figure of merit ( F D ) increased from 7.90×10 −8 to 9.15×10 −8 C cm −2 K −1 and 8.69×10 −5 to 16.74×10 −5 Pa −1/2 , respectively, which make the PNMZT95/5 ceramics potential application in commercial infrared detectors. [ABSTRACT FROM AUTHOR]