TY - JOUR
T1 - Electrical properties and temperature behavior of ZnO-doped PZT-PMnN modified piezoelectric ceramics and their applications on therapeutic transducers
AU - Tsai, Cheng Che
AU - Hong, Cheng Shong
AU - Shih, Chia Chi
AU - Chu, Sheng Yuan
PY - 2012/1/15
Y1 - 2012/1/15
N2 - Pb0.98Ca0.01Sr0.01[(Mn 1/3Nb2/3)0.054Cu0.006-(Zr 0.52Ti0.48)0.94]O3 (PMNCZT) + x wt.% ZnO (PMNCZT-Z10x) ceramics were prepared and sintered at a low temperature 980 °C, using the modified mixed-oxide method. The phase structure and microstructure evolutions were examined by XRD and SEM analyses. Effects of ZnO additives on the dielectric relaxation, piezoelectric, temperature stability, and ferroelectric properties were systematically investigated. The results showed that the ZnO doping increased the tetragonality ratio, tetragonal phase fraction, and long-range order degree of crystal structure. In addition, the electromechanical coupling factors, and the temperature stability of resonance frequency and resonant resistance were improved with increasing the ZnO amounts until x = 1. Beside these properties, the decrease of Qm was related to decreasing in normalized change value of space charge. This developed compositions had kp and kt of 0.56 and 0.55, Qm of 1280, d33 of 285 pC/N, 33T/0 of 980, tan δ of 0.0023, coercive field (Ec) of 11 kV/cm, and remnant polarization (Pr) of 28 μC/cm2. Their corresponding transmission coefficient of intensity exhibited from value of 60.12% (x = 0) to value of 68.56% (x = 2) by the acoustic model calculation. To evaluate the dynamic performance of developed piezoceramics, a 3 MHz therapeutic transducer was fabricated using the trade-off ceramics with x = 0.5. Its properties exhibited that the average effective coupling factors keff2 of 5.6%, electro-acoustic efficiencies of 34.1%, and dynamic acoustic power 0.75 W were better than those of a commercial transducer.
AB - Pb0.98Ca0.01Sr0.01[(Mn 1/3Nb2/3)0.054Cu0.006-(Zr 0.52Ti0.48)0.94]O3 (PMNCZT) + x wt.% ZnO (PMNCZT-Z10x) ceramics were prepared and sintered at a low temperature 980 °C, using the modified mixed-oxide method. The phase structure and microstructure evolutions were examined by XRD and SEM analyses. Effects of ZnO additives on the dielectric relaxation, piezoelectric, temperature stability, and ferroelectric properties were systematically investigated. The results showed that the ZnO doping increased the tetragonality ratio, tetragonal phase fraction, and long-range order degree of crystal structure. In addition, the electromechanical coupling factors, and the temperature stability of resonance frequency and resonant resistance were improved with increasing the ZnO amounts until x = 1. Beside these properties, the decrease of Qm was related to decreasing in normalized change value of space charge. This developed compositions had kp and kt of 0.56 and 0.55, Qm of 1280, d33 of 285 pC/N, 33T/0 of 980, tan δ of 0.0023, coercive field (Ec) of 11 kV/cm, and remnant polarization (Pr) of 28 μC/cm2. Their corresponding transmission coefficient of intensity exhibited from value of 60.12% (x = 0) to value of 68.56% (x = 2) by the acoustic model calculation. To evaluate the dynamic performance of developed piezoceramics, a 3 MHz therapeutic transducer was fabricated using the trade-off ceramics with x = 0.5. Its properties exhibited that the average effective coupling factors keff2 of 5.6%, electro-acoustic efficiencies of 34.1%, and dynamic acoustic power 0.75 W were better than those of a commercial transducer.
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U2 - 10.1016/j.jallcom.2011.08.009
DO - 10.1016/j.jallcom.2011.08.009
M3 - Article
AN - SCOPUS:80054679808
VL - 511
SP - 54
EP - 62
JO - Journal of the Less-Common Metals
JF - Journal of the Less-Common Metals
SN - 0925-8388
IS - 1
ER -