Lead‐free piezoelectric materials such as Na0.5Bi0.5TiO3‐BaTiO3 (NBBT) solid solution have been paid increasing attention from an environmental perspective. In this paper, a series of NBBT single crystals with compositions near the morphotropic phase boundary (MPB) were grown by the top‐seeded solution growth (TSSG) method. The compositional dependence of crystalline structure was investigated by high‐resolution X‐ray diffraction (XRD). In addition, the dielectric, piezoelectric and ferroelectric (FE) properties of NBBT crystals were also investigated. Excellent piezoelectric properties of NBBT crystals, especially large thickness coupling factors kt, were obtained near the MPB, which are more than or close to the performances of PZT ceramics. Moreover, the performances of NBBT crystals can be further enhanced by doping. Finally, the domain configurations of NBBT96/4 crystal were studied preliminarily.

Articles you may be interested inComplete set of material constants of 0.95(Na0.5Bi0.5)TiO3-0.05BaTiO3 lead-free piezoelectric single crystal and the delineation of extrinsic contributions Enhanced ferroelectric and piezoelectric properties in doped lead-free ( Bi 0.5 Na 0.5 ) 0.94 Ba 0.06 TiO 3 thin films Appl. Phys. Lett. 97, 212901 (2010); 10.1063/1.3518484 Macroscopic and nanoscale electrical properties of pulsed laser deposited (100) epitaxial lead-free Na 0.5 Bi 0.5 TiO 3 thin filmsWe investigated the pyroelectric properties of h001i, h110i, and h111i-oriented Mn doped 94.6Na 0.5 Bi 0.5 TiO 3 -5.4BaTiO 3 (94.6NBT-5.4BT) crystals. Among the above three crystallographic orientations, the h111i-oriented crystals possess the highest pyroelectric coefficients and the largest figures of merit. At 20 C, the values of p, F v , and F d reach as high as 5.88 Â 10 À4 C/m 2 K, 29.8 lPa À1/2 , and 0.08 m 2 /C for h111i-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. V C 2014 AIP Publishing LLC.

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