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Formation and properties of some antimony-doped strontium titanate ceramics

A. IANCULESCU1, A. BRAILEANU2,* , G. VOICU1, N. DRAGAN2, D. CRISAN2

Affiliation

  1. University “Politehnica” Bucharest, 1-7 Gh. Polizu, 011061 Bucharest, Romania
  2. Institute of Physical Chemistry “I. G. Murgulescu”of Romanian Academy, 202 Spl. Independenei, 060021 Bucharest, Romania

Abstract

Ceramics of SrTi1-xSbxO3 (0 ≤ x ≤ 0.015) composition were prepared by solid state reaction. Samples were obtained after sintering in air at 1300 and 1400 ºC, respectively, with a soaking time of 3 hours. Even at 1000 ºC, XRD data point out, single phase compositions for al samples studied. Above a critical Sb proportion (x = 0.0075) the microstructure changes and an abnormal grain growth process starts to occur. Besides, the dielectric losses start to decrease and the interfacial polarization increases, leading to the increase of the overal effective permittivity, up to a maximum value of ~ 4500 for x = 0.01.The microstructure feature mentioned, as wel as the dielectric behaviour are correlated with the change of the supplementary charge compensation induced by Sb5+ donor dopant, from an electronic mechanism toward an ionic (by Sr vacancies) one..

Keywords

Defects, Grain size, Microstructure, Dielectric properties, SrTiO3.

Submitted at: Jan. 18, 2006
Accepted at: March 23, 2006

Citation

A. IANCULESCU, A. BRAILEANU, G. VOICU, N. DRAGAN, D. CRISAN, Formation and properties of some antimony-doped strontium titanate ceramics, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 2, pp. 548-552 (2006)