The piezoelectric and ferroelectric properties of 0.852[Bi0.5(Na(1−x)Lix)0.5]TiO3–0.110(Bi0.5K0.5)TiO3–0.038BaTiO3 (x=0, 0.02, 0.05, 0.10, 0.15, and 0.30, abbreviated as BNKLBTx) lead-free piezoelectric ceramics were prepared by conventional ceramic processing. X-ray diffraction on the samples revealed that Li+ ions diffused into the Bi0.5Na0.5TiO3 lattices (A-site) and formed a solid solution with a single perovskite structure. All the samples could be sintered at 1160°–1180°C, with the density being on the order of >95% of the theoretical. The ceramics with x=0.10 exhibited the highest properties, with the piezoelectric coefficient being on the order of d33=235 pC/N, while the electromechanical coupling factors were found to be kp=0.30 and kt=0.45, respectively. The dielectric, pyroelectric, electromechanical, and ferroelectric behaviors were investigated as a function of temperature. It was found that the depolarization temperature Td showed a strong dependence on the content of Li+ addition, shifting to a lower temperature with increasing Li+ dopant.
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Document Type: Research Article
Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802
The State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Publication date: 2010-04-01