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Abstract
(1-x)(Bi0.9La0.1)ScO3-xPbTiO3 (x = 0.47∼0.62, BLS-PT100x) were synthesized by conventional solid-state sintering. A morphotropic phase boundary (MPB) between rhombohedral and tetragonal phases was confirmed by X-ray analysis. The materials show a strong composition dependence on the ferroelectric and piezoelectric properties. The composition near MPB can obtain the optimal electrical properties; however, the electrical properties decay obviously over the boundary. The BLS-PT52 ceramics exhibit the enhanced electrical properties: d 33 = 361 pC/N, k p = 0.40, P r = 24.3 μC/cm2, E c = 1.94 kV/mm and an adjustable broad Curie temperature range from 366 to 467°C. These results show that this composition is a promising candidate for high-temperature piezoelectric materials.
Acknowledgments
The authors would like to thank the support of Natural Science Foundation of China (No.: 50872102), the Key Grant Project of Chinese Ministry of Education (No.: 309022), the program for New Century Excellent Talents in University (No.: NCET-08-0808), key programmer of natural science foundation of China (No. 50932004) and the Chenguang Science Plan of Wuhan (grand No. 200750731268).