Journal
JOURNAL OF APPLIED PHYSICS
Volume 107, Issue 11, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3431387
Keywords
bismuth compounds; coercive force; Curie temperature; ferroelectric ceramics; piezoceramics; remanence; sodium compounds
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Funding
- Hong Kong Polytechnic University [A-PH92]
- research foundation for returned oversea Chinese scholar
- National Nature Science Foundation of China [10874069, 10704021]
- new century excellent talents in university [NCET-08-0279]
- Natural Scientific Research Innovation Foundation in Harbin Institute of Technology [HIT.NSRIF201055]
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(1-x)Bi0.5Na0.5TiO3-xBi(Zn0.5Ti0.5)O-3 [(1-x)BNT-xBZT, x=0, 0.025, 0.0375, 0.050, and 0.075] lead-free piezoceramics were prepared and their structures and electrical properties were investigated. It is found that BZT can increase the Curie temperature of BNT. A morphotropic phase boundary (MPB) separating rhombohedral and tetragonal phases exists near x=0.0375. As the result, the MPB composition shows improved electrical properties; the saturated polarization, remnant polarization, and coercive field are 42.0 mu C/cm(2), 36.5 mu C/cm(2), and 3.5 kV/mm, respectively, while the piezoelectric coefficient, planar electromechanical coupling factor, and unipolar strain are 92 pC/N, 0.22, and 0.08%, respectively. The structures and electrical properties are discussed by comparing with that of other BNT-based piezoceramics. Our results do not only supplement for BNT-based lead-free piezoceramics, but also may provide a way to develop new lead-free piezoceramics with high Curie temperature. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3431387]
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