Grain and the concomitant ferroelectric domain size dependent physical properties of Ba0.85Ca0.15Zr0.1Ti0.9O3 ceramics fabricated using powders derived from oxalate precursor route

被引:71
作者
Bharathi, P. [1 ]
Varma, K. B. R. [1 ]
机构
[1] Indian Inst Sci, Mat Res Ctr, Bangalore 560012, Karnataka, India
关键词
FREE PIEZOELECTRIC CERAMICS; LEAD-FREE CERAMICS; BARIUM-TITANATE; ELECTRICAL-PROPERTIES; MICROSTRUCTURE; FINE; PIEZOCERAMICS; PERMITTIVITY; CRYSTALS; BEHAVIOR;
D O I
10.1063/1.4900494
中图分类号
O59 [应用物理学];
学科分类号
摘要
Fine powders comprising nanocrystallites of Ba0.85Ca0.15Zr0.1Ti0.9O3 (BCZT) were synthesized via oxalate precursor method, which facilitated to obtain homogenous and large grain sized ceramics at a lower sintering temperature. The compacted powders were sintered at various temperatures in the range of 1200 degrees C-1500 degrees C for an optimized duration of 10 h. Interestingly the one that was sintered at 1450 degrees C/10 h exhibited well resolved Morphotrophic Phase Boundary. The average grain size associated with this sample was 30 mu m accompanied by higher domain density mostly with 90 degrees twinning. These were believed to have significant contribution towards obtaining large strain of about 0.2% and piezoelectric coefficient as high as 563 pC/N. The maximum force that was generated by BCZT ceramic (having 30 mu m grain size) was found to be 161 MPa, which is much higher than that of known actuator materials such as PZT (40MPa) and NKN-5-LT (7 MPa). (C) 2014 AIP Publishing LLC.
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页数:10
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