Abstract
The phase structure and electrical properties of (K,Na)NbO3 (KNN)-based lead-free piezoelectric ceramics with nominal composition Li0.03 (NaxK1−x)0.97Nb0.8Ta0.2O3 (LKNNT, x = 0.50−0.55) were investigated with an emphasis on the influence of Na/K ratio. By XRD and Raman measurements, it was revealed that the phase transition from the co-existence of O1 and T1 to the co-existence of O2 and T2 occurs when x = 0.52. At this Na/K ratio, a peak of dielectric constants was obtained, which also corresponds to a morphotropic phase boundary between T1 and T2 besides that between O1 and O2 in LKNNT ceramics. All the Li0.03 (NaxK1−x)0.97Nb0.8Ta0.2O3 ceramics with x = 0.50 − 0.55 show excellent piezoelectric performance, and the piezoelectric coefficient d*33 can reach as high as 335 pm/V. The room-temperature piezoelectric properties in the present LKNNT ceramics are not sensitive to the change of Na/K ratio, indicating that the orthorhombic to tetragonal phase co-existence dominates the enhancement of piezoelectric properties. However, the results on the piezoelectricity measurement at elevated temperature showed possible to further enhance piezoelectric properties by adjusting Na/K ratio in the tetragonal LKNNT ceramics.
Similar content being viewed by others
References
Saito Y, Takao H, Tani T, Nonoyama T, Takatori K, Homma T, Nagaya T, Nakamura M (2004) Nature 432:84
Shrout TR, Zhang SJ (2007) J Electroceram 19:111
Panda PK (2009) J Mater Sci 44:5049. doi: 1007/s10853-009-3643-0
Egerton L, Dillon DM (1959) J Am Ceram Soc 42:438
Li JF, Wang K, Zhang BP, Zhang LM (2006) J Am Ceram Soc 89:706
Guo Y, Kakimoto K, Ohsato H (2005) Mater Lett 59:241
Hollenstein E, Davis M, Damjanovic D, Setter N (2005) Appl Phys Lett 87:182905
Chang Y, Yang Z, Hou Y, Liu Z, Wang Z (2007) Appl Phys Lett 90:232905
Wu L, Zhang J, Zheng P, Wang C (2007) J Phys D Appl Phys 40:3527
Wang K, Li JF (2010) Adv Funct Mater 20:1924
Fu J, Zuo R, Wang X, Li L (2009) J Phys D Appl Phys 42:012006
Xiao DQ, Wu JG, Wu L, Zhu JG, Yu P, Lin DM, Liao YW, Sun Y (2009) J Mater Sci 44:5408. doi:https://doi.org/10.1007/s10853-009-3543-3
Dai Y, Zhang X, Zhou G (2007) Appl Phys Lett 90:262903
Zhang BP, Li JF, Wang K, Zhang H (2006) J Am Ceram Soc 89:1605
Dai YJ, Zhang XW, Chen KP (2009) Appl Phys Lett 94:042905
Saito Y, Takao H (2006) Ferroelectrics 338:17
Wang K, Li JF (2007) Appl Phys Lett 91:262902
Klein N, Hollenstein E, Damjanovic D, Trodahl HJ, Setter N (2007) J Appl Phys 102:014112
Rubio-Marcos F, Banares MA, Romero JJ, Fernandez JF (2010) J Raman Spectrosc. doi:https://doi.org/10.1002/jrs.2753
Jaffe B, Jaffe H, Cook WR (1971) Piezoelectric ceramics. Academic Press, London
Acknowledgements
This study was supported by the National Nature Science Foundation of China (Grant nos. 50772050 and 50921061) and the Ministry of Science and Technology of China under the Grant 2009CB623304, as well as by the Tsinghua University Initiative Scientific Research Program.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Zhou, JJ., Li, JF., Wang, K. et al. Phase structure and electrical properties of (Li,Ta)-doped (K,Na)NbO3 lead-free piezoceramics in the vicinity of Na/K = 50/50. J Mater Sci 46, 5111–5116 (2011). https://doi.org/10.1007/s10853-011-5442-7
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10853-011-5442-7