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Effect of A-Site Ions Additions on Abnormal Grain Growth and Piezoelectric Properties in NKN-5LT Systems

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Abstract:

Dense 0.95(Na0.5K0.5)NbO3-0.05LiTaO3 (NKN-5LT) ceramics, as a candidate for leadfree piezoelectric materials, were developed by conventional sintering process. The effect of additions with A-site ions in perovskite structure on abnormal grain growth and piezoelectric properties in NKN-5LT ceramics was investigated. Sintering temperature was lowered by adding A-site ions as a sintering aid. Abnormal grain growth in NKN-5LT ceramics was observed with varying additions. This grain growth behavior was explained in terms of interface reactioncontrolled nucleation and growth. The electrical properties of NKN-5LT ceramics were investigated as a function of concentration of additions. The electromechanical coupling factor and piezoelectric constant of NKN-5LT ceramics were improved in the samples with A-site ions excess NKN-5LT. These results show that the piezoelectric properties of NKN-5LT samples can be improved by control of the microstructures.

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Periodical:

Materials Science Forum (Volumes 558-559)

Pages:

763-766

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.558-559.763

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Online since:

October 2007

Authors:

Min Soo Kim, Soon Jong Jeong, Jae Sung Song

Keywords:

Lead-Free, Microstructure, Piezoelectric, Sodium Potassium Niobate

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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