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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.
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