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

Linhua Liu; Xiaobing Li; Xiao Wu; Yaojin Wang; Wenning Di; Di Lin; Xiangyong Zhao; Haosu Luo; Neumann, Norbert
November 2009
Applied Physics Letters;11/9/2009, Vol. 95 Issue 19, p192903
Academic Journal
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.


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