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Detailed Program
Paper Number : LP-O07
Time Frame : 17:32~17:44
Presentation Date : Friday, 28, November
Session Name : Leadfree Piezoelectrics
Session Chair 1# : Chang Won Ahn
Session Chair 2# : Tonshaku Tou
Ferroelectric and Piezoelectric response of lead-free Bi0.5Na0.5TiO3-BaTiO-BaZrO3 ceramics
Jamil Ur RAHMAN
Changwon National University
Keywords: Lead-free, Ceramics, Ferroelectric, Piezoelectric, Strain
The piezoelectric material is a material that can be used the inter conversion between electrical and mechanical. Most of the piezoelectric ceramics devices have been fabricated from lead-based piezoelectric ceramic materials, such as Pb(ZrxTi1-x)O3 (PZT), because of their outstanding piezoelectric properties [1-2]. However, the use of lead-based ceramics causes serious environmental problems because of the high toxicity of lead oxide and its high vapor pressure during sintering. Therefore, there is a great need to develop lead-free piezoelectric ceramics with good piezoelectric properties to replace lead-containing ceramics in various applications
Lead-free piezoelectric ceramics (0.935-x) Bi0.5Na0.5TiO3–0.065BaTiO3–xBaZrO3 (BNBT-BZ100x) with x = (0-0.05) were synthesis by a conventional solid-state reaction route. The effect of BZ addition on the structure, Dielectric, ferroelectric and electric field induced strain behavior of BNBT was investigated. X-ray diffraction patterns revealed that BZ completely diffused in BNBT lattice in the studied composition range and found that the structural and electrical properties of BNBT ceramics are significantly influenced by the presence of BZ content. A phase transformation from tetragonal to pseudocubic was observed. However, with increasing BZ content, the maximum dielectric constant continuously decreased and the depolarization temperature Td shifted towards lower temperatures. The polarization and strain hysteresis loops indicate that the addition of BZ significantly disrupts the ferroelectric order. The field induced strain response of BNBT-BZ100x ceramics increases from 0.16% for x = 0 to 0.38% for x = 0.03, at an applied field of 7kV/mm. The corresponding dynamics coefficient for these composition were (Smax/Emax = 231pm/V) and (Smax/Emax = 542pm/V) respectively. The results suggest that the BNBT-BZ3 composition can be considered as promising candidate material for piezoelectric application.
References:
[1] B. Jaffe, W.R. Cook, H. Jaffe, Piezoelectric Ceramics, Academic Press, London, 1971.
[2] N. Ichinose, N. Miyamoto, S. Takahashi, J. Eur. Ceram. Soc. 24 (2004) 1681-1685.
Acknowledgements : This work is supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MOE) (2013R1A1A2058345).