Temperature-dependent electrical properties of 0.94Bi0.5Na 0.5TiO3-0.06BaTiO3 ceramics

被引：0
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作者：
Zhang, Shan-Tao [1 ,2 ]
Kounga, Alain B. [3 ]
Aulbach, Emil [1 ]
Deng, Yu [4 ]
机构：
[1] Institute of Materials Science, Technical University Darmstadt, Petersenstr. 23, Darmstadt 64287, Germany
[2] National Laboratory of Solid State Microstructure, Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China
[3] EPCOS OHG, Corporate Materials R and D, Siemenstr. 43, Deutschlandsberg 8530, Austria
[4] National Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210093, China
来源：
Journal of the American Ceramic Society | 2008年 / 91卷 / 12期
关键词：
Temperature-dependent electrical properties of lead-free 0.94Bi 0.5Na0.5TiO3-0.06BaTiO3 (BNT-BT) ceramics were investigated. Below 100C; this rhombohedral-tetragonal morphotropic phase-boundary composition shows dominant ferroelectric order with typical ferroelectric polarization-electric field (P(E)) loop and butterfly bipolar strain-electric (S(E)) curve. Antiferroelectric order tends to prevail when temperature reaches about 100C; characterized by a pinched P(E) loop and altered bipolar S(E) butterfly. Near the ferroelectric-antiferroelectric transition temperature; the composition shows a giant bipolar and unipolar strain of 0.40% and 0.42%; respectively. The highest value of maximum strain divided by the applied field (i.e; Smax/Emax) reaches 700 pm/V at 100C. With a further increase of temperature to 200C; a slight decrease of the strain is observed. Especially; it is found that the hysteresis of the unipolar S(E) curve decreases with increasing temperature. These results may be helpful for further understanding and thus designing new BNT-based lead-free piezoelectric systems. © 2008 The American Ceramic Society;
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页码：3950 / 3954
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