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Particle Size Effect on the Electrical Properties of Spark-Plasma-Sintered Relaxor Potassium Sodium Niobate Ceramic
C. Wang1, J. Chen1, L. Shen1, J. Rui1, X. Yang1, M. Zhu2, Y. Hou2
1 Logistics School, Beijing Wuzi University, Beijing 101149, P. R. China
2 Key Laboratory of Advanced Functional Materials of China Education Ministry, Beijing University of Technology, Beijing 100124, P. R. China
received December 11, 2016, received in revised form Febuary 2, 2017, accepted March 13, 2017
Vol. 8, No. 2, Pages 255-258 DOI: 10.4416/JCST2016-00116
Abstract
30-nm-grain-sized potassium sodium niobate ((K0.5Na0.5)NbO3 (KNN)) powders were obtained with the sol-gel method. From these powders as starting materials, high-density KNN ceramics with a relative density of 98.9 % and grain size of 500 nm were prepared with the spark plasma sintering (SPS) method. The processing parameters were a sintering temperature of 900 °C, sintering pressure of 30 MPa and sintering time of 3 min. The phase composition, microstructure and electrical properties of the ceramics have been investigated. The results show that, unlike common micro-grained ceramics, submicron-grained ceramics prepared with the SPS method show obvious dielectric relaxation (dispersion factor γ is 1.31). Meanwhile, the KNN ceramics exhibit good electrical properties such as dielectric constant εr = 753, piezoelectric constant d33 = 142 pC/N and electromechanical coupling factor kp = 0.41.
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Keywords
Lead-free piezoelectric ceramics, potassium sodium niobate, submicron-grained, dielectric relaxation, electrical properties.
References
1 Saito, Y., Takao, H., Tani, T., Nonoyama, T., Takatori, K., Homma, T., Nagaya, T., Nakamura, M.: Lead-free piezoceramics, Nature, 432, 84 – 87, (2004).
2 Guo, Y.P., Kakimoto, K., Ohsato, H.: Phase transitional behavior and piezoelectric properties of Na0.5K0.5NbO3 – LiNbO3 ceramics, Appl. Phys. Lett., 85, 4121 – 4123, (2004).
3 Wu, J.G., Zhang, B.Y., Wu, W.J.: Phase structure and electrical properties of barium-modified potassium-sodium niobate-based lead-free ceramics, J. Alloy. Compd., 651. 302 – 307, (2015).
4 Cheng, X.J., Gou, Q., Wu, J.G., Wang, X.P., Zhang, B.Y., Xiao, D.Q., Zhu, J.G., Wang, X.J., Lou, X.J.: Dielectric, ferroelectric, and piezoelectric properties in potassium sodium niobate ceramics with rhombohedral-orthorhombic and orthorhombic-tetragonal phase boundaries, Ceram. Int., 40, 5771 – 5779, (2014).
5 Lee, I.H., Lee, H.S., Kim, Y.H., Gil, S.K., Kang, D.H.: Effects of Al2O3 on the ferroelectric properties of sodium potassium lithium niobate lead-free piezoceramics, Ceram. Int., 39, S709 – S713, (2013).
6 Maeder, M., Damjanovic, D., Setter, N.: Lead-free piezoelectric materials, J. Electroceram., 13, 385 – 392, (2004).
7 Hou, Y.D., Zhu, M.K., Hou, L., Liu, J. B., Tang, J. L., Wang, H., Yan, H.: Synthesis and characterization of lead-free K0.5Bi0.5TiO3 ferroelectrics by sol-gel technique, J. Cryst. Growth, 273, 500 – 503, (2005).
8 Li, Y.M., Liu, H., Shen, Z.Y., Wang, Z.M., Hong, Y., Li, Y.Y.: Preparation of (K, Na)NbO3-based lead-free piezoelectric ceramic by microwave-hydrothermal method, J. Chin. Ceram. Soc., 39, 1922 – 1927, (2011).
9 Predoana, L., Barau, A., Zaharescu, M., Vassilchina, H., Velinova, N., Banov, B., Momchilov, A.: Electrochemical properties of the LiCoO2 powder obtained by sol-gel method, J. Eur. Ceram. Soc., 27, 1137 – 1142, (2007).
10 Linardos, S., Zhang, Q., Alcock, J.R.: Preparation of sub-micron PZT particles with the sol-gel technique, J. Eur. Ceram. Soc., 26, 117 – 123, (2006).
11 Krebs, J.K., Happek, U.: Optical spectroscopy of trivalent chromium in sol-gel lithium niobate, Appl. Phys. Lett., 87, 251910 – 1 – 3, (2005).
12 Li, B.R., Liu, D.Y., Liu, J.J.: Two-step sintering assisted consolidation of bulk titania nano-ceramics by spark plasma sintering, Ceram. Int., 38, 3693 – 3699, (2012).
13 Kumar, R., Chaubey, A.K., Bathula, S.: Synthesis and characterization of Al2O3-TiC nano-composite by spark plasma sintering, Int. J. Refract. Met. H., 54, 304 – 308, (2016).
14 Nuthalapati, M., Karak, S.K., Chakravarty D.: Development of nano-Y2O3 dispersed zr alloys by mechanical alloying and spark plasma sintering, Mater. Sci. Eng. A, 650, 145 – 153, (2016).
15 Wang, C., Chen, J., Chen H.L., Hou, Y.D., Zhu, M.K.: Preparation and properties of nanocrystalline potassium sodium niobate ceramics, J. Inorg. Mater., 30, 59 – 64, (2015).
16 Wang, C., Hou, Y.D., Ge, H., Y., Zhu, M.K., Wang, H., Yan, H.: Sol-gel synthesis and characterization of lead-free LNKN nanocrystalline powder, J. Cryst. Growth, 310, 4635 – 4639, (2008).
17 Uchino, K., Nomura, S.: Critical exponents of the dielectric constants in diffused-phase-transition crystals, Ferroelectrics, 44, 55 – 61, (1982).
18 Chattopadhyay, S., Ayyub, P., Palkar, V.R., Multani, M.: Size-induced diffuse phase transition in the nanocrystalline ferroelectric PbTiO3, Phys. Rev. B, 52, 13177 – 13183, (1995).
19 Park, Y., Lee, W.J., Kim, H.G.: Particle-size-induced diffuse phase transition in the fine-particle barium titanate porcelains, J. Phys. Condens. Mat., 9, 9445 – 9456, (1997).
20 Zhang, L.M., Zhang, B.P., Li, J.F., Wang, K., Zhang, H.L.: Normal sintering of lead-free piezoceramic potassium sodium niobate and its electrical properties, J. Chin. Ceram. Soc., 35, 1 – 5, (2007).
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