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Detailed Program
Paper Number : LP-I15
Time Frame : 17:44~18:05
Presentation Date : Friday, 28, November
Session Name : Leadfree Piezoelectrics
Session Chair 1# : Chang Won Ahn
Session Chair 2# : Tonshaku Tou
Fabrication of Textured Na0.5Bi0.5TiO3–BaZrO3 Ceramics by Tape Casting Technique
Ali HUSSAIN
Changwon National University
Over the past two decades, lead-free piezoelectric ceramics have been focused as alternative materials for the replacement of lead-based ceramics in piezoelectric industry [1]. Nevertheless, most of the lead-free piezoelectric ceramics have substandard properties as compared with lead-based piezoelectric ceramics. Much research works have been conducted to investigate new materials and methods for the improvement of piezoelectric properties of lead-free ceramics. In general, two methods are considered very effective: first, development of new ceramics through compositional modification of the morphotropic boundary (MPB) solid solution, second, fabrication of textured ceramics, i.e., ceramics having a uniform grain orientation.
Grain orientation technique, such as templated grain growth (TGG) method has been largely used to prepare textured ferroelectric and piezoelectric ceramics with perovskite structure [2]. In this work, textured 0.94Na0.5Bi0.5TiO3-0.06BaZrO3 (NBT-BZ) ceramics with a preferred {100} grain orientation were fabricated by a tape casting method using plate-like Na0.5Bi0.5TiO3 (NBT) particles and their physical properties were compared with non-textured NBT-BZ ceramics prepared by a conventional method. The experimental results show that textured NBT-BZ ceramics sintered at 1150 oC for 15 h have improved dielectric and piezoelectric properties. Both textured and non-textured ceramics exhibit pseudo-cubic crystal structure, however, textured NBT-BZ ceramics have {100} preferred orientation degree of 83% and have large grain growth. The room temperature dielectric constant increased from 1250 for non-textured ceramics to 1580 for the textured NBT-BZ ceramics. The textured ceramics show high piezoelectric constant than non-textured NBT-BZ ceramics. In addition, the field-induced strain response improved from 0.15% for non-textured NBT-BZ to 0.30% for textured NBT-BZ ceramics.

References:
[1] J. Rödel, W. Jo W, K. T. P. Seifert, E-M. Anton, T. Granzow, D. Damjanovic, J. Am. Ceram. Soc. 92 (2009)1153.
[2] H. Amorín, A. L. Kholkin, M. E. V. Costa, J. Eur. Ceram. Soc. 25 (2005) 2453.

Acknowledgements : This work is supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MOE) (2013R1A1A2058345) and Basic Research program through the National Research Foundation of Korea (NRF) funded by Ministry, Science and Technology (MEST) (2011-0030058).