期刊
JOURNAL OF PHYSICS D-APPLIED PHYSICS
卷 45, 期 19, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/45/19/195301
关键词
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资金
- International Science & Technology Cooperation Program of China [2010DFB13640, 2011DFA51880]
- Natural Science Foundation of China [90923001]
- Shaanxi Province International Collaboration Program [2009KW-12, 2010KW-09]
- Shaanxi Province Science and Technology Promotion Program [2011TG-08]
- Changjiang Scholar Program
- Chinese Government
- Natural Science and Engineering Research Council of Canada (NSERC)
We report high pyroelectricity in lead-free 0.5Ba(Zr0.2Ti0.8) O-3-0.5(Ba0.7Ca0.3) TiO3 (BZT-50BCT) ceramics which were previously reported to exhibit high piezoelectricity. The pyroelectric coefficient measured by the Byer-Roundy method upon heating for dc-poled samples shows a high value of 5.84 x 10(-4) C m(-2) K-1 at 300 K, comparable to those of PZT-based ceramics and significantly higher than many other lead-free pyroelectric materials. The pyroelectric coefficient calculated from the remanent polarization versus temperature relationship obtained during a cooling process is 17.17 x 10(-4) C m(-2) K-1 at 300 K, which is considerably larger than the value obtained by the Byer-Roundy method. This difference is attributed to the thermal hysteresis of the rhombohedral-tetragonal phase transition between the heating and cooling processes.
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