Dependence of depolarization temperature on cation vacancies and lattice distortion for lead-free 74(Bi{sub 1/2}Na{sub 1/2})TiO{sub 3}-20.8(Bi{sub 1/2}K{sub 1/2})TiO{sub 3}-5.2BaTiO{sub 3} ferroelectric ceramics
- College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124 (China)
In this paper, the off-morphotropic-phase-boundary 74(Bi{sub 1/2}Na{sub 1/2})TiO{sub 3}-20.8(Bi{sub 1/2}K{sub 1/2})TiO{sub 3}-5.2BaTiO{sub 3} ceramics were fabricated at different sintering temperatures. It was found out that as the sintering temperature increases, the volatilization of the A-site elements is aggravated, thus generating the oxygen vacancies; meanwhile, the tetragonality of the perovskite lattice reduces gradually. Besides, the temperature-dependent dielectric responses revealed that as the sintering temperature increases, the depolarization temperature T{sub d} decreases while the Curie-Weiss point T{sub C} increases. It is suggested that the lattice distortion, other than the oxygen vacancies, is the crucial factor in influencing the depolarization temperature.
- OSTI ID:
- 21294070
- Journal Information:
- Applied Physics Letters, Vol. 94, Issue 18; Other Information: DOI: 10.1063/1.3130736; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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