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Research Article | Open Access

High-performance (K,Na)NbO3-based multilayer piezoelectric ceramic actuators with nickel inner electrodes

Yu Huana( )Limin HouaTao WeiaFenghua Jianga( )Ting WangbLongtu LicXiaohui Wangc
School of Materials Science and Engineering, University of Jinan, Jinan 250022, China
Guangdong Key Laboratory of Electronic Functional Materials and Devices, Huizhou University, Huizhou 516007, China
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
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Graphical Abstract


Multilayer ceramic actuator (MLCA) has been widely employed in actuators due to the large cumulative displacement under the low driving voltage. In this work, the MLCA devices consisting of a lead-free MnCO3- and CuO-doped 0.96(K0.48Na0.52)(Nb0.96Ta0.04)O3–0.04CaZrO3 piezoelectric ceramics and a base nickel (Ni) metal inner electrode were well co-fired by the two-step sintering process in a reducing atmosphere. The ceramic layer/electrode interface is well-integrated and clearly continuous without distinct interdiffusion and chemical reaction, which is beneficial to the electrical reliability of the MLCA. As a result, the MLCA laminated with nine active ceramic layers obtains an ultrahigh piezoelectric coefficient d33 of 3157 pC/N, about 9 times than bulk ceramics. The 0.5 mm-thick MLCA composed of a series of ~50 μm-thick ceramic layers and ~3 μm-thick Ni electrodes reaches a high 1.8 μm displacement under the low applied voltage of 200 V (the same displacement requires a voltage as high as 3700 V for ~1 mm-thick bulk ceramics). The excellent electrical performance and low-cost base electrode reveal that the (K,Na)NbO3 (KNN)-based MLCAs are promising lead-free candidate for actuator application.


Wilson SA, Jourdain RPJ, Zhang Q, et al. New materials for micro-scale sensors and actuators. Mat Sci Eng R 2007, 56: 1–129.
Fan PY, Liu K, Ma WG, et al. Progress and perspective of high strain NBT-based lead-free piezoceramics and multilayer actuators. J Materiomics 2021, 7: 508–544.
Liu H, Liu YX, Song AZ, et al. (K,Na)NbO3-based lead-free piezoceramics: One more step to boost applications. Natl Sci Rev 2022, 9: nwac101.
Wang K, Li JF. (K,Na)NbO3-based lead-free piezoceramics: Phase transition, sintering and property enhancement. J Adv Ceram 2012, 1: 24–37.
Wang XJ, Huan Y, Zhu YX, et al. Defect engineering of BCZT-based piezoelectric ceramics with high piezoelectric properties. J Adv Ceram 2022, 11: 184–195.
Kim SW, Lee TG, Kim DH, et al. Thermally stable large strain in low-loss (Na0.2K0.8)NbO3–BaZrO3 for multilayer actuators. J Am Ceram Soc 2019, 102: 6837–6849.
Seo IT, Kang IY, Cha YJ, et al. Piezoelectric properties of CuO-added (Na0.5K0.5)NbO3 ceramic multilayers. J Eur Ceram Soc 2012, 32: 1085–1090.
Gao RL, Chu XC, Huan Y, et al. Ceramic–electrode inter-diffusion of (K,Na)NbO3-based multilayer ceramics with Ag0.7Pd0.3 electrode. J Eur Ceram Soc 2015, 35: 389–392.
Gao LS, Guo HZ, Zhang SJ, et al. Base metal co-fired multilayer piezoelectrics. Actuators 2016, 5: 8.
Sato S, Nakano Y, Sato A, et al. Mechanism of improvement of resistance degradation in Y-doped BaTiO3 based MLCCs with Ni electrodes under highly accelerated life testing. J Eur Ceram Soc 1999, 19: 1061–1065.
Waser R. Bulk conductivity and defect chemistry of acceptor-doped strontium titanate in the quenched state. J Am Ceram Soc 1991, 74: 1934–1940.
Waser R, Baiatu T, Härdtl KH. DC electrical degradation of perovskite-type titanates: I, Ceramics. J Am Ceram Soc 1990, 73: 1645–1653.
Yamamatsu J, Kawano N, Arashi T, et al. Reliability of multilayer ceramic capacitors with nickel electrodes. J Power Sources 1996, 60: 199–203.
Wang XZ, Huan Y, Wang ZX, et al. Electrical conduction and dielectric relaxation mechanisms in the KNN-based ceramics. J Appl Phys 2019, 126: 104101.
Wang ZX, Huan Y, Feng Y, et al. Design of p-type NKN-based piezoelectric ceramics sintered in low oxygen partial pressure by defect engineering. J Am Ceram Soc 2020, 103: 3667–3675.
Huan Y, Wang XH, Wei T, et al. Defect control for enhanced piezoelectric properties in SnO2 and ZrO2 co-modified KNN ceramics fired under reducing atmosphere. J Eur Ceram Soc 2017, 37: 2057–2065.
Huan Y, Wang XJ, Yang WY, et al. Optimizing energy harvesting performance by tailoring ferroelectric/relaxor behavior in KNN-based piezoceramics. J Adv Ceram 2022, 11: 935–944.
Kawada S, Kimura M, Higuchi Y, et al. (K,Na)NbO3-based multilayer piezoelectric ceramics with nickel inner electrodes. Appl Phys Express 2009, 2: 111401.
Kobayashi K, Doshida Y, Mizuno Y, et al. Possibility of cofiring a nickel inner electrode in a (Na0.5K0.5)NbO3–LiF piezoelectric actuator. Jpn J Appl Phys 2013, 52: 09KD07.
Gao LS, Ko SW, Guo HZ, et al. Demonstration of copper co-fired (Na,K)NbO3 multilayer structures for piezoelectric applications. J Am Ceram Soc 2016, 99: 2017–2023.
Kim DH, Joung MR, Seo IT, et al. Influence of sintering conditions on piezoelectric properties of KNbO3 ceramics. J Eur Ceram Soc 2014, 34: 4193–4200.
Park HY, Seo IT, Choi JH, et al. Low-temperature sintering and piezoelectric properties of (Na0.5K0.5)NbO3 lead-free piezoelectric ceramics. J Am Ceram Soc 2010, 93: 36–39.
Cen ZY, Yu Y, Zhao PY, et al. Grain configuration effect on the phase transition, piezoelectric strain and temperature stability of KNN-based ceramics. J Mater Chem C 2019, 7: 1379–1387.
Malič B, Razpotnik H, Koruza J, et al. Linear thermal expansion of lead-free piezoelectric K0.5Na0.5NbO3 ceramics in a wide temperature range. J Am Ceram Soc 2011, 94: 2273–2275.
Zhang HB, Ma WG, Xie B, et al. (Na1/2Bi1/2)TiO3-based lead-free co-fired multilayer actuators with large strain and high fatigue resistance. J Am Ceram Soc 2019, 102: 6147–6155.
Zuo RZ, Li LT, Gui ZL, et al. Vapor diffusion of silver in cofired silver/palladium–ferroelectric ceramic multilayer. Mat Sci Eng B 2001, 83: 152–157.
Long DM, Klein A, Dickey EC. Barrier formation at BaTiO3 interfaces with Ni and NiO. Appl Surf Sci 2019, 466: 472–476.
Shannon RD. Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides. Acta Crystallogr A 1976, 32: 751–767.
Green DJ, Guillon O, Rödel J. Constrained sintering: A delicate balance of scales. J Eur Ceram Soc 2008, 28: 1451–1466.
Wang G, Lu ZL, Li Y, et al. Electroceramics for high-energy density capacitors: Current status and future perspectives. Chem Rev 2021, 121: 6124–6172.
Malik RA, Hussain A, Maqbool A, et al. Temperature-insensitive high strain in lead-free Bi0.5(Na0.84K0.16)0.5TiO3–0.04SrTiO3 ceramics for actuator applications. J Am Ceram Soc 2015, 98: 3842–3848.
Chen J, Du ZZ, Yang YT, et al. The electrical properties of low-temperature sintered 0.07Pb(Sb1/2Nb1/2)O3–0.93Pb (ZrxTi1−x)O3 multilayer piezoceramic actuator. Ceram Int 2021, 47: 15195–15201.
Chae SJ, Lee TG, Kim DS, et al. Superior piezoelectric properties of lead-free thick-films and their application to alternative multilayer actuator. J Alloys Compd 2020, 834: 155079.
Kang JK, Han HS, Jeong SK, et al. Microwave and conventional sintering of lead-free (K,Na)NbO3-based piezoelectric ceramic multilayer actuators. J Ceram Process Res 2013, 14: 230–233.
Kim MS, Jeon S, Lee DS, et al. Lead-free NKN–5LT piezoelectric materials for multilayer ceramic actuator. J Electroceram 2009, 23: 372–375.
Lee JS, Jeong SK, Nguyen VQ, et al. Fabrication of (K0.47Na0.51Li0.02)(Nb0.8Ta0.2)O3 multilayer ceramic actuators with AgPd–ceramic composite inner electrode. Ferroelectrics 2011, 422: 77–80.
Hussain F, Khesro A, Lu ZL, et al. Lead free multilayer piezoelectric actuators by economically new approach. Front Mater 2020, 7: 87.
Hatano K, Yamamoto A, Kishimoto S, et al. Investigation of displacement property and electric reliability of (Li,Na,K)NbO3-based multilayer piezoceramics. Jpn J Appl Phys 2016, 55: 10TD03.
Journal of Advanced Ceramics
Pages 1228-1237
Cite this article:
Huan Y, Hou L, Wei T, et al. High-performance (K,Na)NbO3-based multilayer piezoelectric ceramic actuators with nickel inner electrodes. Journal of Advanced Ceramics, 2023, 12(6): 1228-1237.








Web of Science






Received: 03 March 2023
Revised: 04 April 2023
Accepted: 11 April 2023
Published: 05 June 2023
© The Author(s) 2023.

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