Microstructure Evolution and Dielectric Properties of Nb/Mn and Dy/Mn Doped Barium Titanate Ceramics

Abstract:

Article Preview

Nb/Mn and Dy/Mn codoped BaTiO3 specimens, prepared by conventional solid-state procedure, were investigated regarding their microstructural and dielectric properties. The powders were doped with Nb2O5 and Dy2O3 with an amount of 0.1, 0.5 and 1.0 at% of dopants ions. The MnO content of 0.05 at% Mn was the same in both types of samples. The specimens were sintered in air at 1320 and 1350 °C for two hours. Microstructural and compositional studies were done by SEM equipped with EDS. In low doped BaTiO3 the grain size is around 1-3 μm, while in ceramics with high dopant content (1.0 at%) the grain size distribution was in the range of 3-10 μm. High dielectric constant is associated with small-grained microstructure, being 5000 for Dy-doped and 6500 for Nb-doped BaTiO3 sintered at 1350 °C. The specimens with low dopant content demonstrate the Curie-Weiss behavior in a paraelectric regime. A nearly flat permittivity response with temperature was obtained for specimens with 0.5 and 1.0 at% Dy content. Loss tangents were in the range of 0.03 - 0.32.

Info:

Periodical:

Edited by:

Dragan P. Uskokovic, Slobodan K. Milonjic and Dejan I. Rakovic

Pages:

229-234

DOI:

10.4028/www.scientific.net/MSF.518.229

Citation:

L. Živković et al., "Microstructure Evolution and Dielectric Properties of Nb/Mn and Dy/Mn Doped Barium Titanate Ceramics ", Materials Science Forum, Vol. 518, pp. 229-234, 2006

Online since:

July 2006

Export:

Price:

$35.00

[1] P. Hansen, D. Henings and H. Schreinemacher: J. Electroceram. Vol. 2.

[2] (1998), p.85.

[2] E. Brzozowski and M.S. Castro: J. Eur. Ceram. Soc. Vol. 24.

[8] (2004), p.2499.

[3] M.N. Rahaman and R. Manalert: J. Eur. Ceram. Soc. Vol. 18 (1998), p.1063.

[4] J.M. Wu and C.J. Chen: J. Am. Ceram. Soc. Vol. 73.

[2] (1990), p.420.

[5] A. Yamaji, Y. Enomoto, K. Kinoshita and T. Murakami: J. Am. Ceram. Soc. Vol. 60 [3-4] (1977), p.97.

[6] W.H. Lee, W.A. Groen, H. Schreinemacher and D. Henings: J. Electroceram. Vol. 5.

[1] (2000), p.31.

[7] D. Makovec, Z. Samardžija and M. Drofenik: J. Am. Ceram. Soc. Vol. 87.

[7] (2004), p.1324.

[8] K. Albertsen, D. Hennings and O. Steigelmann: J. Electroceram. Vol. 2.

[3] (1998), p.193.

[9] H. Kishi, N. Kohzu, Y. Iguchi, J. Sugino, M. Kato, H. Ohasato and T. Okuda: J. Eur. Ceram. Soc. Vol. 21 (2001), p.1643.

[10] N. Kurata and M. Kuwabara: J. Am. Ceram. Soc. Vol. 76.

[6] (1993), p.1605.

[11] T. Nagai, K. Iijima, H.J. Hwang, M. Sando, T. Sekino and K. Niihara: J. Am. Ceram. Soc. Vol. 83.

[1] (2000), p.107.

[12] R.P.S.M. Lobo, N.D.S. Mohallem and R. Moreira: J. Am. Ceram. Soc. Vol. 78.

[5] (1995), p.1343.

[13] T. Armstrong and R. Buchanan: J. Am. Ceram. Soc. Vol. 73.

[5] (1990), p.1268.

[14] Lj.M. Zivkovic, V.V. Mitic, V.V. Paunovic, Lj. Vracar and B.D. Stojanovic: Ceramic Transactions Vol. 167 (2005), p.117.

In order to see related information, you need to Login.