Properties of Lanthanum-Doped Bismuth Sodium Titanate (Bi_0.5Na_0.5TiO₃) Prepared by Soft Combustion Technique

Abstract:

In this work, soft combustion technique was used to study the effect of lanthanum (La) doping on the properties of Bi_0.5Na_0.5TiO₃ (BNT). The amount of La dopant investigated for (Bi_0.5Na_0.5)_(1-1.5x)La_xTiO₃ (BNLT) pellets were x = 0, 0.01, 0.02, 0.05 and 0.10 (0, 1, 2, 5 and 10 mol% La). The addition of La dopant into the BNT structure caused lattice distortion and altered the crystal symmetry of the BNT from hexagonal to tetragonal symmetry for BNLT. BNT and BNLT pellets were sintered at 1100°C for 3 hours and pure perovskite phase BNT was obtained with the addition of La up to 5 mol%. A secondary phase of Bi₂(Ti₂O₇) appeared when the pellet was doped with 10 mol% of La dopant. Increasing of La dopant in the pellet resulted in the increasing of dielectric constant and decreasing of dielectric loss. An optimum property was obtained by 5 mol% BNLT with dielectric constant of 753 and dielectric loss of 0.0377. Normal 0 false false false EN-US X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;}

• Periodical: Advanced Materials Research (Volume 858)
• Pages: 141-146
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.858.141
• Online since: November 2013
• Authors: Mei Ling Cheah, Khairunisak Abdul Razak, Chai Yan Ng
• Keywords: Ceramic, Chemical Synthesis, Dielectric Response, Microstructure

References

[1] P. Marchet, E. Boucher, V. Dorcet, J.P. Mercurio, Dielectric properties of some low-lead or lead-free perovskite-derived materials: Na0. 5Bi0. 5TiO3–PbZrO3, Na0. 5Bi0. 5TiO3–BiScO3 and Na0. 5Bi0. 5TiO3–BiFeO3 ceramics, Journal of the European Ceramic Society, 26 (2006).

DOI: 10.1016/j.ceramint.2020.06.187

[2] C. Berbecaru, M. Cernea, G.V. Aldica, R. Trusca, Structural and electrical properties of BNT-BT0. 08 ceramics processed by spark plasma sintering, World Academy of Science, Engineering and Technology, 79 (2011) 147-150.

[3] R.B. Heimann, Classic and Advanced Ceramics: From Fundamentals to Applications, Wiley-VCH, Weinheim, (2010).

[4] J.Y. Yi, J. -K. Lee, K. -S. Hong, Dependence of the microstructure and the electrical properties of lanthanum-substituted (Na1/2Bi1/2)TiO3 on cation vacancies, Journal of the American Ceramic Society, 85 (2002) 3004-3010.

DOI: 10.1111/j.1151-2916.2002.tb00570.x

[5] J. Qiu, J. Tani, K. Orikasa, H. Takahashi, Fabrication of a lead-free BNT piezoelectric material using a hybrid sintering process, International Journal of Applied Electromagnetics and Mechanics, 21 (2005) 171-181.

DOI: 10.3233/jae-2005-682

[6] A. Watcharapasorn, S. Jiansirisomboon, T. Tunkasiri, Effects of dysprosium oxide addition in bismuth sodium titanate ceramics, Journal of Electroceramics, 21 (2008) 613-616.

DOI: 10.1007/s10832-007-9280-6

[7] J. -H. Cho, Y. -J. Ma, Y. -H. Lee, M. -P. Chun, B. -I. Kim, Piezoelectric ceramic powder synthesis of bismuth-sodium titanate by a hydrothermal process, Journal of Ceramic Processing Research, 7 (2006) 91-94.

[8] C. Zhou, X. Liu, W. Li, C. Yuan, Dielectric and piezoelectric properties of Bi0. 5Na0. 5TiO3–Bi0. 5K0. 5TiO3–BiCrO3 lead-free piezoelectric ceramics, Journal of Alloys and Compounds, 478 (2009) 381-385.

DOI: 10.1016/j.jallcom.2008.11.057

[9] P.Y. Goh, K.A. Razak, S. Sreekantan, Structural and morphology studies of praseodymium-doped bismuth titanate prepared using a wet chemical route, Journal of Alloys and Compounds, 475 (2009) 758-761.

DOI: 10.1016/j.jallcom.2008.07.129

[10] Y.J. Ma, J.H. Cho, Y.H. Lee, B.I. Kim, Hydrothermal synthesis of (Bi1/2Na1/2)TiO3 piezoelectric ceramics, Materials Chemistry and Physics, 98 (2006) 5-8.

DOI: 10.1016/j.matchemphys.2004.09.045

[11] X. Jing, Y. Li, Q. Yin, Hydrothermal synthesis of Na0. 5Bi0. 5TiO3 fine powders, Materials Science and Engineering: B, 99 (2003) 506-510.

DOI: 10.1016/s0921-5107(02)00515-9

[12] T. Hoshina, K. Takizawa, J. Li, T. Kasama, H. Kakemoto, T. Tsurumi, Domain size effect on dielectric properties of barium titanate ceramics, Japanese Journal of Applied Physics, 47 (2008) 7607-7611.

DOI: 10.1143/jjap.47.7607