| Piezoelectric, Dielectric and Ferroelectric response of Nb5+ modified of Lead-free 0.97(Bi0.5Na0.5Ti1-xNbx)O3-0.03BaZrO3 ceramics |
| Mr. Rahman Jamil Ur |
| Changwon National University |
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| The piezoelectric material is a material that can be used the inter conversion between electrical and mechanical energy. 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. In this work we have prepared 0.97(Bi0.5Na0.5Ti1-xNbx)O3-0.03BaZrO3 lead-free ceramics (with x = 0~0.03), by a conventional solid-state reaction method. Crystal structure, microstructure, dielectric, ferroelectric and piezoelectric properties of Nb-modified BNT-BZ3 ceramics were studied. X-ray diffraction patterns revealed the formation of single phase perovskite structure with x ¢®Â 0.015. The depolarization temperature and dielectric constant were decreasing with increasing Nb-contents. The remanent polarization (Pr) and piezoelectric constant (d33) increased from 28 ¥ìC/cm2 and 98 pC/N for x = 0 to 31 ¥ìC/cm2 and 128 pC/N for x = 0.005, respectively. In addition, electric field-induced strain was enhanced to form a maximum value (Smax = 0.17%) with normalized The piezoelectric material is a material that can be used the inter conversion between electrical and mechanical energy. 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. In this work we have prepared 0.97(Bi0.5Na0.5Ti1-xNbx)O3-0.03BaZrO3 lead-free ceramics (with x = 0~0.03), by a conventional solid-state reaction method. Crystal structure, microstructure, dielectric, ferroelectric and piezoelectric properties of Nb-modified BNT-BZ3 ceramics were studied. X-ray diffraction patterns revealed the formation of single phase perovskite structure with x ¢®Â 0.015. The depolarization temperature and dielectric constant were decreasing with increasing Nb-contents. The remanent polarization (Pr) and piezoelectric constant (d33) increased from 28 ¥ìC/cm2 and 98 pC/N for x = 0 to 31 ¥ìC/cm2 and 128 pC/N for x = 0.005, respectively. In addition, electric field-induced strain was enhanced to form a maximum value (Smax = 0.17%) with normalized piezoelectric coefficient (d*33 = 283 pm/V) at an applied electric field 6kV/mm for x = 0.015. 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). |
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