Microstructural and Dielectric Properties of Conventional and Microwave Sintered CaCu₃Ti₄O₁₂ Ceramics

Abstract:

ts well known that CaCu₃Ti₄O₁₂ (CCTO) ceramic presents high dielectric constants, which makes it a strong candidate to be used in microelectronic devices. Several routes were proposed to obtain CCTO crystalline phase, influencing in microstructure and sintering conditions of the ceramics. In this study CCTO powders were produced by a new chemical route, providing reduction on hold time and sintering temperature. Furthermore, the sintering was performed in conventional and microwave oven that produced different microstructures. In this way, the microstructure and dielectric properties of these ceramics were evaluated and compared, showing the higher values of dielectric constant due to lower grain size and reduced copper-rich phase on grain boundary presented by microwave sintered ceramics.

• Periodical: Materials Science Forum (Volumes 727-728)
• Pages: 1063-1068
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.727-728.1063
• Online since: August 2012
• Authors: Daniel Thomazini, Maria Virginia Gelfuso, Gabriel Moreira Lima, José Antônio Eiras
• Keywords: CaCu₃Ti₄O₁₂, Giant Dielectric Constant, Microwave Sintering

References

[1] M. Subramanian, D. Li, N. Duan , B. Reisner, A. Sleight: Journal of Solid State Chemistry Vol. 151 (2000), p.323.

[2] M. Subramanian: Solid State Sciences Vol. 4 (2002), p.347.

[3] P. Fiorenza, R. L. Nigro, C. Bongiorno, V. Raineri, M.C. Ferarrelli, D.C. Sinclair, A.R. West: Applied Physics Letters Vol. 92 (2008), p.182907.

DOI: 10.1063/1.2919095

[4] T.T. Fang, L.T. Mei, J Am Ceram Soc. Vol. 90 (2007), p.638.

[5] B. Bochu, M.N. Deschizeaux, J.C. Joubert: J. Solid State Chem. Vol. 29 (1979), p.291.

[6] P.B.A. Fechine, A.F.L. Almeida, J.C. Goés, J.M. Sasaki, R. Jimenez, J. Mendiola, A.S.B. Sombra: Mater. Chem. Phys. Vol. 96 (2006), p.402.

[7] A.F.L. Almeida, R.E.S. Oliveira, J.M. Sasaki, A.S.B. Sombra, L.C. Kretly: Micr. Opt. Technol. Lett. Vol. 39 (2003), p.145.

[8] L.C. Kretly, A.F.L. Almeida, P.B.A. Fechine, R.S. de Oliveira, A.S.B. Sombra: J. Mat. Sci. Vol. 15 (2004), p.657.

[9] P.B.A. Fechine, A.F.L. Almeida, J.C. Goés, M.A. Valente, M.A.R. Miranda, A.S.B. Sombra: Mat. Sci. Eng B Vol. 111 (2004), p.113.

[10] A.F.L. Almeida, R.S. de Oliveira, J.C. Goés, J. M. Sasaki, J. M. Filho, A.S.B. Sombra: Mat. Sci. Eng. B Vol. 96 (2002), p.275.

[11] Jin S, Xia H, Zhang Y, Guo J, Xu J.: Materials Letters Vol. 61 (2007), p.1404.

[12] C. Kumar: J Mater Sci: Mater Electron Vol. 22 (2011) p.579.

[13] B. Barbier, C. Combettes, S. Guillemet-Fritsch, T. Chartier, F. Rossignol, A. Rumeau, T. Lebey, E. Dutarde: Journal of the European Ceramic Society Vol. 29 (2009), p.731.

DOI: 10.1016/j.jeurceramsoc.2008.07.042

[14] JCPDS Chart Pattern #21-0140 (1997).

[15] Zhao J, Liu J, Ma G. Ceramics International, In press, (2011).

[16] Xie Z, Yang J, Huang X, Huang Y. Journal of the European Ceramic Society Vol. 19 (1999), p.381.

[17] P. Leret, J.F. Fernandez, J. de Frutos, D. Fernandez-Hevia: J. of the Eur. Ceram. Soc. Vol. 27 (2007), p.3901.

[18] J.J. Romero, P. Leret, F. Rubio-Marcos, A. Quesada, J.F. Fernández. Journal of the European Ceramic Society Vol. 30 (2010), p.737.

DOI: 10.1016/j.jeurceramsoc.2009.08.024

[19] D.E. Clark, D.C. Folz, J.K. West: Mater. Sci. Eng. A Vol. 287 (2000), p.153.

[20] S. Hutagalung, M. Ibrahim, Z. Ahmad: Ceramics International Vol. 34 (2008), p.939.