TY - JOUR
T1 - Modified (K0.5 Na0.5) Nb O3 based lead-free piezoelectrics with broad temperature usage range
AU - Zhang, Shujun
AU - Xia, Ru
AU - Shrout, Thomas R.
N1 - Funding Information:
This work was supported by the Office of Naval Research (ONR) and National Institutes of Health (NIH) under Grant No. P41-RR11795.
PY - 2007
Y1 - 2007
N2 - (K0.5 Na0.5) Nb O3 (KNN) based lead-free materials exhibit arguably, comparable piezoelectric properties to conventional Pb (Zr,Ti) O3 ceramics owing to an orthorhombic to tetragonal polymorphic phase transition (TO-T) occurring near room temperature. However, this transition correspondingly results in a strong temperature dependence of the dielectric and piezoelectric properties, being limited further by domain instability, during thermal cycling between the two ferroelectric phases. Analogous to BaTi O3 based piezoelectrics, the addition of CaTi O3 in KNN materials was found to shift the TO-T well below room temperature. Piezoelectric and electromechanical values of KNN-LiSb O3 -CaTi O3 material were found to be d33 ∼210 pCN, d15 ∼268 pCN and k33 ∼61%, k15 ∼56%, respectively, with greatly improved temperature stability over the temperature range of -50-200 °C, demonstrating practical potential for actuator and/or ultrasonic transducer applications.
AB - (K0.5 Na0.5) Nb O3 (KNN) based lead-free materials exhibit arguably, comparable piezoelectric properties to conventional Pb (Zr,Ti) O3 ceramics owing to an orthorhombic to tetragonal polymorphic phase transition (TO-T) occurring near room temperature. However, this transition correspondingly results in a strong temperature dependence of the dielectric and piezoelectric properties, being limited further by domain instability, during thermal cycling between the two ferroelectric phases. Analogous to BaTi O3 based piezoelectrics, the addition of CaTi O3 in KNN materials was found to shift the TO-T well below room temperature. Piezoelectric and electromechanical values of KNN-LiSb O3 -CaTi O3 material were found to be d33 ∼210 pCN, d15 ∼268 pCN and k33 ∼61%, k15 ∼56%, respectively, with greatly improved temperature stability over the temperature range of -50-200 °C, demonstrating practical potential for actuator and/or ultrasonic transducer applications.
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U2 - 10.1063/1.2794400
DO - 10.1063/1.2794400
M3 - Article
AN - SCOPUS:34848884461
SN - 0003-6951
VL - 91
JO - Applied Physics Letters
JF - Applied Physics Letters
IS - 13
M1 - 132913
ER -