Pyroelectric properties of Mn-doped 94.6Na0.5Bi0.5TiO3-5.4BaTiO3 lead-free single crystals.

We investigated the pyroelectric properties of <001>, <110>, and <111>-oriented Mn doped 94.6Na0.5Bi0.5TiO3-5.4BaTiO3 (94.6NBT-5.4BT) crystals. Among the above three crystallographic orientations, the <111>-oriented crystals possess the highest pyroelectric coefficients and the largest figures of merit. At 20 °C, the values of p, Fv, and Fd reach as high as 5.88 x 10-4 °C/m² K, 29.8 µPa-1/2, and 0.08 m²/C for <111>-oriented crystals, respectively, which are superior to other lead-free ferroelectric materials. The crystals also demonstrate a high depolarization temperature and relatively stable thermal pyroelectric property. These results indicate the potential of Mn-doped 94.6NBT-5.4BT crystals for lead-free infrared pyroelectric detectors. [ABSTRACT FROM AUTHOR]