TY - JOUR
T1 - Lead-free NKN-based materials for ultrasonic therapeutic transducers
T2 - Resistance to temperature and humidity
AU - Weng, Chung Ming
AU - Tsai, Cheng Che
AU - Hong, Cheng Shong
AU - Sheen, Jyh
AU - Chu, Sheng Yuan
N1 - Funding Information:
We gratefully acknowledge the financial support provided from the Ministry of Science and Technology (MOST), Taiwan, R.O.C. (grant numbers: MOST 103-2221-E-272-004-MY2, MOST 105-2218-E-006-008, MOST 105-2221-E-006-215, MOST 106-2622-E-006-019-CC3, MOST 106-2221-E-272-003).
Publisher Copyright:
© 2017 The Electrochemical Society. All rights reserved.
PY - 2017
Y1 - 2017
N2 - In this study, CuF2 and LiNbO3 modified lead-free (Na, K)NbO3 (NKN)-based ceramics (NKNCF and NKLN) were synthesized using solid-state reaction methods. The influence of doping materials on the electrical properties and stability of the synthesized ceramics was then investigated. The ceramics synthesized with CuF2 and LiNbO3 dopants were of higher density than pure NKN ceramics and far more stable under the effects of temperature and humidity. NKNCF ceramics sintered at 1000◦C exhibited excellent “hard” piezoelectric properties (kp = 35%, kt = 45%, d33 = 88 pC/N, Qm = 2800, and tanδ = 0.1%). In contrast, NKLN ceramics sintered at 950◦C exhibited excellent “soft” piezoelectric properties (kp = 50%, kt = 53%, d33 = 150 pC/N, Qm = 168, and tanδ = 4%). The ceramics were then used in the fabrication of 3-MHz ultrasonic therapeutic transducers driven by a self-tuning circuit to investigate the dynamic performance. Our results clearly demonstrate that the resonance resistance, Qm, and tanδ play a more important role in the generation of acoustic power of ultrasonic therapeutic transducers than the electromechanical coupling coefficient (k). The CuF2-doped ceramics were found to easily generate a greater acoustic power, which makes them suitable for applications in therapeutic transducers.
AB - In this study, CuF2 and LiNbO3 modified lead-free (Na, K)NbO3 (NKN)-based ceramics (NKNCF and NKLN) were synthesized using solid-state reaction methods. The influence of doping materials on the electrical properties and stability of the synthesized ceramics was then investigated. The ceramics synthesized with CuF2 and LiNbO3 dopants were of higher density than pure NKN ceramics and far more stable under the effects of temperature and humidity. NKNCF ceramics sintered at 1000◦C exhibited excellent “hard” piezoelectric properties (kp = 35%, kt = 45%, d33 = 88 pC/N, Qm = 2800, and tanδ = 0.1%). In contrast, NKLN ceramics sintered at 950◦C exhibited excellent “soft” piezoelectric properties (kp = 50%, kt = 53%, d33 = 150 pC/N, Qm = 168, and tanδ = 4%). The ceramics were then used in the fabrication of 3-MHz ultrasonic therapeutic transducers driven by a self-tuning circuit to investigate the dynamic performance. Our results clearly demonstrate that the resonance resistance, Qm, and tanδ play a more important role in the generation of acoustic power of ultrasonic therapeutic transducers than the electromechanical coupling coefficient (k). The CuF2-doped ceramics were found to easily generate a greater acoustic power, which makes them suitable for applications in therapeutic transducers.
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U2 - 10.1149/2.0191710jss
DO - 10.1149/2.0191710jss
M3 - Article
AN - SCOPUS:85033789757
SN - 2162-8769
VL - 6
SP - P733-P740
JO - ECS Journal of Solid State Science and Technology
JF - ECS Journal of Solid State Science and Technology
IS - 10
ER -