A Study on Densification and Grain Growth of Ba(Ce,Zr)O₃ Prepared by a Two-Step Sintering

Abstract:

Ultra-fine powder of Ba (Ce,Zr)O₃ was prepared by a sol-gel method using metal nitrate salts as pre-cursor. The powder was compacted using hydraulic press with pressure of 45 kg/m² for 5 min to produce four different pellets. They were sintered at two temperature profiles using two-step sintering (TSS) process. The first temperature profile was fixed at T₁ = 1450°C and the second temperature profile was varies from T₂ = 1300°C, 1350°C and 1400°C, respectively. For a comparison, the pellet was also sintered using conventional step sintering (CSS) with temperature of T = 1450°C. Scanning electron microscope (SEM) images for the fracture surface showed that the grain growth for the pellet sintered at T₂ = 1350°C was suppressed compared to others. Majority of it grain size was in the range of 100 to 390 nm. For densification study, all the pellets sintered using TSS profile exhibited lower density than CSS method. Even though TSS method can retard the grain growth but in terms of densification, CSS method is better than TSS.

• Periodical: Materials Science Forum (Volume 819)
• Pages: 129-133
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.819.129
• Online since: June 2015
• Authors: N.W. Othman, A. Ramli, N. Osman, S.S.C. Abdullah, M.E.A. Rahman
• Keywords: Ba (Ce,Zr)O₃, Densification, Grain Growth, Sol-Gel, Two-Step Sintering

References

[1] Osman, N., Talib, I. A., & Hamid, H. A. Preparation and Characterization of Yb-Doped Ba(Ce, Zr)O3Nanopowders with High Sinterability. Ionics, 16(6), (2010), p.561–569.

DOI: 10.1007/s11581-010-0427-0

[2] Nasani, N., Dias, P. a. N., Saraiva, J. a., & Fagg, D. P. Synthesis and Conductivity of Ba(Ce, Zr, Y)O3−δ Electrolytes for PCFCs by New Nitrate-Free Combustion Method. International Journal of Hydrogen Energy, (2013), 38(20), p.8461–8470.

DOI: 10.1016/j.ijhydene.2013.04.078

[3] Zając, W., Hanc, E., Gorzkowska-Sobas, A., Świerczek, K., & Molenda, J. Nd-Doped Ba(Ce, Zr)O3−δ Proton Conductors for Application in Conversion of CO2 into Liquid Fuels. Solid State Ionics, (2012), 225, p.297–303.

DOI: 10.1016/j.ssi.2012.05.024

[4] Sawant, P., Varma, S., Wani, B. N., & Bharadwaj, S. R. Synthesis, Stability and Conductivity of BaCe0. 8−xZrxY0. 2O3−δ as Electrolyte for Proton Conducting SOFC. International Journal of Hydrogen Energy, (2012), 37(4), p.3848–3856.

DOI: 10.1016/j.ijhydene.2011.04.106

[5] Mazaheri, M., Simchi, a., & Golestani-Fard, F. Densification and Grain Growth of Nanocrystalline 3Y-TZP duringTwo-Step Sintering. Journal of the European Ceramic Society, (2008), 28(15), 2933–2939.

DOI: 10.1016/j.jeurceramsoc.2008.04.030

[6] Wang, X. H., Deng, X. Y., Bai, H. -L., Zhou, H., Qu, W. -G., Li, L. T., & Chen, I. W. Two-Step Sintering of Ceramics with Constant Grain-Size, II: BaTiO3 and Ni-Cu-Zn Ferrite. Journal of the American Ceramic Society, (2006), 89, p.438–443.

DOI: 10.1111/j.1551-2916.2005.00728.x

[7] Park, M. -B., & Cho, N. -H. Effect of Sintering Time on the Chemical and Electrical Features of the Grain Boundary of the Semiconducting SrTiO3Ceramics Synthesized from Surface-Coated Powders. Applied Surface Science, (2004), 234(1-4), p.487–492.

DOI: 10.1016/j.apsusc.2004.05.042

[8] Razavi Hesabi, Z., Haghighatzadeh, M., Mazaheri, M., Galusek, D., & Sadrnezhaad, S. K. Suppression of Grain Growth in Sub-Micrometer Alumina via Two-Step Sintering Method. Journal of the European Ceramic Society, (2009), 29(8), p.1371–1377.

DOI: 10.1016/j.jeurceramsoc.2008.08.027

[9] Mazaheri, M., Zahedi, a. M., & Sadrnezhaad, S. K. Two-Step Sintering of Nanocrystalline ZnO Compacts: Effect of Temperature on Densification and Grain Growth. Journal of the American Ceramic Society, (2007), 91, p.56–63.

DOI: 10.1111/j.1551-2916.2007.02029.x

[10] Osman, N., Abdullah, N. A., & Hasan, S. Chelating Agent Role in Synthesizing Cerate-Zirconate Powder by a Sol-Gel Method. Advanced Materials Research, (2014), 896(3), p.112–115.

DOI: 10.4028/www.scientific.net/amr.896.112

[11] Osman, N., Jani, a. M., & Talib, I. A. Synthesis of Yb-doped Ba(Ce, Zr)O3 Ceramic Powders by Sol–Gel Method. Ionics, (2007), 12(6), 379–384.

DOI: 10.1007/s11581-006-0064-9

[12] Mazaheri, M., Zahedi, a. M., Haghighatzadeh, M., & Sadrnezhaad, S. K. Sintering of Titania Nanoceramic: Densification and Grain Growth. Ceramics International, (2009), 35(2), 685–691.

DOI: 10.1016/j.ceramint.2008.02.005

[13] C. I Wei, X.H. Wang, Sintering Dense Nanocrystalline Ceramics without Final-Stage Grain Growth, (2000), Nature 404 168–171.

DOI: 10.1038/35004548