TY - JOUR
T1 - The temperature-dependent electrical properties of Bi0.5Na 0.5TiO3-BaTiO3-Bi0.5K 0.5TiO3 near the morphotropic phase boundary
AU - Zhang, Shan Tao
AU - Yang, Bin
AU - Cao, Wenwu
N1 - Funding Information:
This work was supported by the National Nature Science Foundation of China (10874069 and 10704021), the Fundamental Research Funds for the Central Universities (1115021301 and 1116021301) and Natural Scientific Research Innovation Foundation in Harbin Institute of Technology (HIT.NSRIF 201055).
PY - 2012/1
Y1 - 2012/1
N2 - Bi0.5Na0.5TiO3-BaTiO3-Bi 0.5K0.5TiO3 (BNT-BT-BKT) lead-free piezoceramics with compositions near the rhombohedral-tetragonal morphotropic phase boundary (MPB) were prepared and investigated. At room temperature, all ceramics show excellent electrical properties. In this study, the best properties were observed in 0.884BNT-0.036BT-0.08BKT, with the remnant polarization, bipolar total strain, unipolar strain, piezoelectric constant, and planar electromechanical coupling factor being 34.4 μC cm-2, 0.25%, 0.15%, 122 pC N-1, and 0.30, respectively. Detailed analysis of the temperature dependence of polarization-electric field (P-E) loops and bipolar/unipolar strain-electric field (S-E) curves of this composition revealed a ferroelectric-antiferroelectric phase transition around 100 °C. Around this temperature, there is a significant shape change in both P-E and S-E curves, accompanied by enhanced strain and decreased polarization; the largest recoverable strain reaches 0.42%. These results can be explained by the formation of antiferroelectric order and the contribution of field-induced antiferroelectric-ferroelectric phase transition to piezoelectric response. Our results indicate that BNT-BT-BKT lead-free piezoceramics can have excellent electrical properties in compositions near the MPB and also reveal some insight into the temperature dependence of the electrical performance with the MPB composition.
AB - Bi0.5Na0.5TiO3-BaTiO3-Bi 0.5K0.5TiO3 (BNT-BT-BKT) lead-free piezoceramics with compositions near the rhombohedral-tetragonal morphotropic phase boundary (MPB) were prepared and investigated. At room temperature, all ceramics show excellent electrical properties. In this study, the best properties were observed in 0.884BNT-0.036BT-0.08BKT, with the remnant polarization, bipolar total strain, unipolar strain, piezoelectric constant, and planar electromechanical coupling factor being 34.4 μC cm-2, 0.25%, 0.15%, 122 pC N-1, and 0.30, respectively. Detailed analysis of the temperature dependence of polarization-electric field (P-E) loops and bipolar/unipolar strain-electric field (S-E) curves of this composition revealed a ferroelectric-antiferroelectric phase transition around 100 °C. Around this temperature, there is a significant shape change in both P-E and S-E curves, accompanied by enhanced strain and decreased polarization; the largest recoverable strain reaches 0.42%. These results can be explained by the formation of antiferroelectric order and the contribution of field-induced antiferroelectric-ferroelectric phase transition to piezoelectric response. Our results indicate that BNT-BT-BKT lead-free piezoceramics can have excellent electrical properties in compositions near the MPB and also reveal some insight into the temperature dependence of the electrical performance with the MPB composition.
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U2 - 10.1016/j.actamat.2011.10.010
DO - 10.1016/j.actamat.2011.10.010
M3 - Article
AN - SCOPUS:81055136569
SN - 1359-6454
VL - 60
SP - 469
EP - 475
JO - Acta Materialia
JF - Acta Materialia
IS - 2
ER -