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Journal of Advanced Ceramics 2014, 3(2): 147-154 https://doi.org/10.1007/s40145-014-0105-1
Research Article | Open Access | Issue | Published: 01 June 2014

Microstructure and piezoelectric properties of K5.70Li4.07Nb10.23O30-added K0.5Na0.5NbO3 ceramics

Show Author's Information Xuming PANGb,  Jinhao QIUa( ),  Kongjun ZHUa
Department of Mechanical Engineering, Nanjing Tech University, Nanjing 210009, China
State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
Keywords:
electrical properties, ceramics, phase transformation, sintering aid
Cite this article:
PANG X, QIU J, ZHU K. Microstructure and piezoelectric properties of K5.70Li4.07Nb10.23O30-added K0.5Na0.5NbO3 ceramics. Journal of Advanced Ceramics, 2014, 3(2): 147-154. https://doi.org/10.1007/s40145-014-0105-1
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Abstract Full text About this article

Lead-free piezoelectric ceramics K0.5Na0.5NbO3–xmol%K5.70Li4.07Nb10.23O30 (x = 0–2.5, KNN–xmol%KLN) were prepared by conventional sintering technique. The phase structure and electrical properties of KNN ceramics were investigated as a function of KLN concentration. The results showed that small amount of KLN introduced into the lattice formed a single phase perovskite structure. The KLN modification lowered the phase transition temperature of orthorhombic–tetragonal (TO–T) and increased the Curie temperature (TC). Some abnormal coarse grains were formed in a matrix when the content of KLN was relatively low (1 mol%). However, normally grown grains were only observed when the sintering aid content was increased to 2 mol%. Proper content of KLN decreased the amount of defects, thus the remanent polarization increased and the coercive field decreased markedly, and the sinterability of the KNN ceramics was simultaneously improved with significant increase of piezoelectric properties.


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Microstructure and piezoelectric properties of K5.70Li4.07Nb10.23O30-added K0.5Na0.5NbO3 ceramics

Show Author's information Xuming PANGb, Jinhao QIUa( ), Kongjun ZHUa
Department of Mechanical Engineering, Nanjing Tech University, Nanjing 210009, China
State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Abstract

Lead-free piezoelectric ceramics K0.5Na0.5NbO3–xmol%K5.70Li4.07Nb10.23O30 (x = 0–2.5, KNN–xmol%KLN) were prepared by conventional sintering technique. The phase structure and electrical properties of KNN ceramics were investigated as a function of KLN concentration. The results showed that small amount of KLN introduced into the lattice formed a single phase perovskite structure. The KLN modification lowered the phase transition temperature of orthorhombic–tetragonal (TO–T) and increased the Curie temperature (TC). Some abnormal coarse grains were formed in a matrix when the content of KLN was relatively low (1 mol%). However, normally grown grains were only observed when the sintering aid content was increased to 2 mol%. Proper content of KLN decreased the amount of defects, thus the remanent polarization increased and the coercive field decreased markedly, and the sinterability of the KNN ceramics was simultaneously improved with significant increase of piezoelectric properties.

Keywords: electrical properties, ceramics, phase transformation, sintering aid

References(28)

[1]
Jaffe B, Roth RS, Marzullo S. Piezoelectric properties of lead zirconate–lead titanate solid–solution ceramics. J Appl Phys 1954, 25: 809–810.
DOI Google Scholar
[2]
Park S-E, Shrout TR. Ultrahigh strain and piezoelectric behavior in relaxor based ferroelectric single crystals. J Appl Phys 1997, 82: 1804–1811.
DOI Google Scholar
[3]
Fan H, Kim H-E. Effect of lead content on the structure and electrical properties of Pb((Zn1/3Nb2/3)0.5(Zr0.47Ti0.53)0.5)O3 ceramics. J Am Ceram Soc 2001, 84: 636–638.
Google Scholar
[4]
Egerton L, Dillom DM. Piezoelectric and dielectric properties of ceramics in the system potassium–sodium niobate. J Am Ceram Soc 1959, 42: 438–442.
DOI Google Scholar
[5]
Zuo R, Fang X, Ye C. Phase structures and electrical properties of new lead-free (Na0.5K0.5)NbO3–(Bi0.5Na0.5)TiO3 ceramics. Appl Phys Lett 2007, 90: 092904.
Google Scholar
[6]
Haertling GH. Properties of hot-pressed ferroelectric alkali niobate ceramics. J Am Ceram Soc 1967, 50: 329–330.
DOI Google Scholar
[7]
Wang R, Xie R, Sekiya T, et al. Piezoelectric properties of spark-plasma-sintered (Na0.5K0.5)NbO3–PbTiO3 ceramics. Jpn J Appl Phys 2002, 41: 7119–7122.
DOI Google Scholar
[8]
Matsubara M, Kikuta K, Hirano S. Piezoelectric properties of (K0.5Na0.5)(Nb1−xTax)O3−K5.4CuTa10O29 ceramics. J Appl Phys 2005, 97: 114105.
Google Scholar
[9]
Takao H, Saito Y, Aoki Y, et al. Microstructural evolution of crystalline-oriented (K0.5Na0.5)NbO3 piezoelectric ceramics with a sintering aid of CuO. J Am Ceram Soc 2006, 89: 1951–1956.
DOI Google Scholar
[10]
Yang M-R, Hong C-S, Tsai C-C, et al. Effect of sintering temperature on the piezoelectric and ferroelectric characteristics of CuO doped 0.95(Na0.5K0.5)NbO3–0.05LiTaO3 ceramics. J Alloys Compd 2009, 488: 169–173.
DOI Google Scholar
[11]
Park S-H, Ahn C-W, Nahm S, et al. Microstructure and piezoelectric properties of ZnO-added (Na0.5K0.5)NbO3 ceramics. Jpn J Appl Phys 2004, 43: L1072–L1074.
DOI Google Scholar
[12]
Kosec M, Kolar D. On activated sintering and electrical properties of NaKNbO3. Mater Res Bull 1975, 10: 335–339.
DOI Google Scholar
[13]
Tashiro S, Nagamatsu H, Nagata K. Sinterability and piezoelectric properties of KNbO3 ceramics after substituting Pb and Na for K. Jpn J Appl Phys 2002, 41: 7113–7118.
DOI Google Scholar
[14]
Guo Y, Kakimoto K, Ohsato H. Dielectric and piezoelectric properties of lead-free (Na0.5K0.5)NbO3–SrTiO3 ceramics. Solid State Commun 2004, 129: 279–284.
DOI Google Scholar
[15]
Kakimoto K, Masuda I, Ohsato H. Ferroelectric and piezoelectric properties of KNbO3 ceramics containing small amounts of LaFeO3. Jpn J Appl Phys 2003, 42: 6102–6105.
DOI Google Scholar
[16]
Choi SW, Shrout TR, Jang SJ, et al. Morphotropic phase boundary in Pb(Mg1/3Nb2/3)O3–PbTiO3 system. Mater Lett 1989, 8: 253–255.
DOI Google Scholar
[17]
Kim M-S, Lee D-S, Park E-C, et al. Effect of Na2O additions on the sinterability and piezoelectric properties of lead-free 95(Na0.5K0.5)NbO3–5LiTaO3 ceramics. J Eur Ceram Soc 2007, 27: 4121–4124.
DOI Google Scholar
[18]
Choi S-Y, Kang S-JL. Sintering kinetics by structural transition at grain boundaries in barium titanate. Acta Mater 2004, 52: 2937–2943.
DOI Google Scholar
[19]
Kim M-S, Jeong S-J, Song J-S. Microstructures and piezoelectric properties in the Li2O-excess 0.95(Na0.5K0.5)NbO3–0.05LiTaO3 ceramics. J Am Ceram Soc 2007, 90: 3338–3340.
DOI Google Scholar
[20]
Park CW, Yoon DY. Abnormal grain growth in alumina with anorthite liquid and the effect of MgO addition. J Am Ceram Soc 2002, 85: 1585–1593.
DOI Google Scholar
[21]
Kim M-S, Fisher JG, Kang S-JL, et al. Grain growth control and solid-state crystal growth by Li2O/PbO addition and dislocation introduction in the PMN–35PT system. J Am Ceram Soc 2006, 89: 1237–1243.
DOI Google Scholar
[22]
Li J-F, Wang K, Zhang B-P, et al. Ferroelectric and piezoelectric properties of fine-grained Na0.5K0.5NbO3 lead-free piezoelectric ceramics prepared by spark plasma sintering. J Am Ceram Soc 2006, 89: 706–709.
DOI Google Scholar
[23]
Zhen Y, Li J-F. Abnormal grain growth and new core–shell structure in (K,Na)NbO3-based lead-free piezoelectric ceramics. J Am Ceram Soc 2007, 90: 3496–3502.
DOI Google Scholar
[24]
Ringgaard E, Wurlitzer T. Lead-free piezoceramics based on alkali niobates. J Eur Ceram Soc 2005, 25: 2701–2706.
DOI Google Scholar
[25]
Zhao P, Zhang B-P, Li J-F. High piezoelectric d33 coefficient in Li-modified lead-free (Na,K)NbO3 ceramics sintered at optimal temperature. Appl Phys Lett 2007, 90: 242909.
DOI Google Scholar
[26]
Guo SJ. Powder Sintering Theory. Beijing: Metallurgical Industry Press, 1998.
[27]
Guo Y, Kakimoto K, Ohsato H. Phase transitional behavior and piezoelectric properties of (Na0.5K0.5)NbO3–LiNbO3 ceramics. Appl Phys Lett 2004, 85: 4121–4123.
DOI Google Scholar
[28]
Hollenstein E, Davis M, Damjanovic D, et al. Piezoelectric properties of Li- and Ta-modified (K0.5Na0.5)NbO3 ceramics. Appl Phys Lett 2005, 87: 182905.
DOI Google Scholar
Publication history
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Publication history

Received: 19 January 2014
Revised: 26 March 2014
Accepted: 12 April 2014
Published: 01 June 2014
Issue date: June 2014

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© The author(s) 2014

Acknowledgements

This work was supported by the Natural Science Foundation of Jiangsu Province, China (BK20130791), Projects of International Cooperation and Exchanges NSFC (51161120326), Aeronautical Science Fund (20131552025), the NUAA Fundamental Research Funds (NS2013008), and a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

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Open Access: This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.

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