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Structure and electrical properties of Bi0.5Na0.5TiO3-Y0.5Na0.5TiO3-BaTiO3 lead-free piezoelectric ceramics |
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| Authors: | Dunmin Lin K W Kwok |
| Affiliation: | 1. College of Chemistry and Materials Science, Sichuan Normal University, 610066, Chengdu, China 2. Visual Computing and Virtual Reality Key Laboratory of Sichuan Province, Sichuan Normal University, 610066, Chengdu, China 3. Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China |
| Abstract: | New (1 – x ? y)Bi0.5Na0.5TiO3-xY0.5Na0.5TiO3-yBaTiO3 lead-free ceramics have been prepared by a conventional ceramic fabrication technique, and their structure and electrical properties have been studied. A morphotropic phase boundary (MPB) of rhombohedral and tetragonal phases is formed at 0.04 < y < 0.10. As compared to pure Bi0.5Na0.5TiO3 ceramic, the partial substitutions of Y3+ for Bi3+ and Ba2+ for (Bi0.5Na0.5)2+ in the A-sites of Bi0.5Na0.5TiO3 lower effectively the coercive field E c and increase the remanent polarization P r of the ceramics. Because of low E c, large P r and the MPB, the ceramics with x = 0–0.02 and y = 0.06 exhibit the optimum piezoelectric properties: d 33 = 155–159 pC/N and k p = 28.8–36.7%. The temperature dependences of dielectric properties of the ceramics show relaxor-like behaviors. The ferroelectric properties at different temperature suggest that the ceramics may contain both the polar and non-polar regions near/above T d. |
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