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Preparation and study of structural properties of zincdoped barium stannate

C. DOROFTEI1,* , P. D. POPA2, F. IACOMI1

Affiliation

  1. “Al. I. Cuza” University, Faculty of Physics, 11 Carol I Blvd, 7000506 Iasi, Romania.
  2. Institute of Technical Physics, Bd. D. Mangeron 47, 700050 Iasi, Romania.

Abstract

In the present work, we report the results of the influence of the Zn ions that partly substitute the Ba ions in the barium stannate (Ba1-xZnxSnO3, where x = 0 - 0.5), on the structural properties. With the view to obtain a porous and finer structure, thus providing a high specific surface, these materials were obtained through the precursor method of combustion (coprecipitation in a colloidal environment, and combustion), followed by heat treatments. The phase composition and morphology were studied through XRD and SEM techniques. The pure sample, as well as that with the substitution x < 0.1, are single phased after 40 minutes sintering at 1000 o C. For substitutions with x ≥ 0.1 secondary phases appear, but the structure becomes finer and the area of specific surface increases for x = 0.2, remaining then constant with the increasing doping with zinc ions up to x = 0.5. The sample with the substitution x = 0.2-0.5 is characterized by a very fine structure (~300 nm) and an effective porosity (21%). These materials obtained through this new method are quite promising for the realization of quality humidity or gas sensors..

Keywords

Perovskites; Porous material; Ultrafine grained microstructure; SEM; XRD.

Submitted at: July 8, 2011
Accepted at: April 11, 2012

Citation

C. DOROFTEI, P. D. POPA, F. IACOMI, Preparation and study of structural properties of zincdoped barium stannate, Journal of Optoelectronics and Advanced Materials Vol. 14, Iss. 3-4, pp. 413-417 (2012)