TY - JOUR
T1 - Improvement of electromechanical coupling coefficient in shear-mode of piezoelectric ceramics
AU - Qin, Lei
AU - Jia, Junbo
AU - Choi, Minkyu
AU - Uchino, Kenji
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (No. 61671068, 11604363, 61771060), and the Beijing College Innovation Capability Promotion Plan of Beijing Municipal Institutions (No. TJSHG201510772015).
Funding Information:
This work was supported by the National Natural Science Foundation of China (No. 61671068 , 11604363 , 61771060 ), and the Beijing College Innovation Capability Promotion Plan of Beijing Municipal Institutions (No. TJSHG201510772015 ).
PY - 2019/2/1
Y1 - 2019/2/1
N2 - Shear vibration mode of piezoelectric ceramic has been widely used in energy harvesting for its high electromechanical coupling coefficient (k15) and high piezoelectric constant (d15). In this study, the effects of dimensions on the piezoelectric shear performance of PZT-5A type ceramic were initially studied with ATILA/GiD finite element simulation to improve k15, and verified by experiments. We found out k15 dominantly correlates with the ratio of width to thickness, and dimension optimization was conducted for the first and high order shear vibrations. As a result, a maximum electromechanical coupling coefficient for k15 shear-mode reaching 0.612 was obtained in the first order harmonics. It is worth to note that the dimension ratio for optimized electro-mechanical coupling factor were in a similar scale regardless of the order of harmonics. In addition to the dimension optimization, the effect of mode coupling between shear vibration mode and unwanted mode was also investigated. The coupling between two vibrations did not only affect electromechanical coupling coefficient but also distorted resonance peak spectrum. Thus, the dimension ratios to avoid mode coupling was provided as the length should far away from the thickness. Finally, the effects of dimensions on mechanical quality factor were examined and the results were discussed. The mechanical quality factor will decrease when the mode coupling happens.
AB - Shear vibration mode of piezoelectric ceramic has been widely used in energy harvesting for its high electromechanical coupling coefficient (k15) and high piezoelectric constant (d15). In this study, the effects of dimensions on the piezoelectric shear performance of PZT-5A type ceramic were initially studied with ATILA/GiD finite element simulation to improve k15, and verified by experiments. We found out k15 dominantly correlates with the ratio of width to thickness, and dimension optimization was conducted for the first and high order shear vibrations. As a result, a maximum electromechanical coupling coefficient for k15 shear-mode reaching 0.612 was obtained in the first order harmonics. It is worth to note that the dimension ratio for optimized electro-mechanical coupling factor were in a similar scale regardless of the order of harmonics. In addition to the dimension optimization, the effect of mode coupling between shear vibration mode and unwanted mode was also investigated. The coupling between two vibrations did not only affect electromechanical coupling coefficient but also distorted resonance peak spectrum. Thus, the dimension ratios to avoid mode coupling was provided as the length should far away from the thickness. Finally, the effects of dimensions on mechanical quality factor were examined and the results were discussed. The mechanical quality factor will decrease when the mode coupling happens.
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U2 - 10.1016/j.ceramint.2018.10.018
DO - 10.1016/j.ceramint.2018.10.018
M3 - Article
AN - SCOPUS:85055744856
SN - 0272-8842
VL - 45
SP - 1496
EP - 1502
JO - Ceramics International
JF - Ceramics International
IS - 2
ER -