Dielectric, ferroelectric, and pyroelectric characterization of Mn-doped 0.74Pb(Mg1/3Nb2/3)O3–0.26PbTiO3 crystals for infrared detection applications

Abstract

We investigated the dielectric, ferroelectric, and pyroelectric properties of Mn-doped 0.74Pb(Mg1/3Nb2/3)O3–0.26PbTiO3 crystals. Compared with pure PMN-0.26PT, Mn substitutions resulted in reduced dielectric loss and enhanced coercive field. Furthermore, the pyroelectric coefficient and detectivity figures of merits were enhanced to 17.2×10−4 C/m2 K and 40.2×10−5 Pa−1/2, respectively, which were the highest values so far reported among intrinsic pyroelectric materials with rhombohedral-tetragonal phase transition temperature greater than 90 °C. The specific detectivity of infrared detector based on Mn-doped crystals was 1.07×109 cm Hz1/2 W−1, and approximately doubles that of commercial LiTaO3 crystals-based, which makes them promising candidates for infrared detectors applications.