期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 45, 页码 31109-31119出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b08879
关键词
diffuse phase transition; electrostriction; doping; lead-free; ferroelectric
资金
- Natural Science Basis Research Plan in Shaanxi Province of China [2015JM5199, 2015JQ5135, 2015JM5185]
- National Nature Science Foundation of China [51402243, 51502248]
- Fundamental Research Funds for the Central Universities
- National Basic Research Program of China (973 Program) [2015CB654602]
- International Science & Technology Cooperation Program of China [2013DFR50470]
- 111 Project [B14040]
The electrostrictive effect has some advantages over the piezoelectric effect, including temperature stability and hysteresis-free character. In the present work, we report the diffuse phase transitions and electrostrictive properties in lead-free Fe3+-doped 0.5Ba(Zr0.2Ti0.8)O-3-0.5(Ba0.7CaO3)TiO3 (BZT-0.5BCT) ferroelectric ceramics. The doping concentration was set from 0.25 to 2 mol %. It is found that by introducing Fe3+ ion into BZT-0.5BCT, the temperature corresponding to permittivity maximum T-m was shifted toward lower temperature monotonically by 37 degrees C per mol % Fe3+ ion. Simultaneously, the phase transitions gradually changed from classical ferroelectric-to-paraelectric phase transitions into diffuse phase transitions with a weak relaxor characteristic. Purely electrostrictive responses with giant electrostrictive coefficient Q(33) between 0.04 and 0.05 m(4)/C-2 are observed from 25 to 100 degrees C for the compositions doped with 1-2 mol % Fe3+ ion. The Q(33) of Fe3+-doped BZT-0.5BCT ceramics is almost twice the Q(33) of other ferroelectric ceramics. These observations suggest that the present system can be considered as a potential lead-free material for the applications in electrostrictive area and that BT-based ferroelectric ceramics would have giant electrostrictive coefficient over other ferroelectric systems.
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