Abstract
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 × 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.
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