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Gas Selectivity of Polycrystalline Thick Films of SrPb1−xBixO3−δ

Published online by Cambridge University Press:  01 February 2011

Carlos R. Michel ,
Gloria Santillán ,
Abraham Quino  and
Arturo Chávez
Carlos R. Michel
Affiliation:
Departamento de Física, CUCEI, Universidad de Guadalajara, Blvd. Marcelino G.Barragán 1421, Guadalajara, Jalisco 44430, México.
Gloria Santillán
Affiliation:
Departamento de Física, CUCEI, Universidad de Guadalajara, Blvd. Marcelino G.Barragán 1421, Guadalajara, Jalisco 44430, México.
Abraham Quino
Affiliation:
Departamento de Física, CUCEI, Universidad de Guadalajara, Blvd. Marcelino G.Barragán 1421, Guadalajara, Jalisco 44430, México.
Arturo Chávez
Affiliation:
Departamento de Física, CUCEI, Universidad de Guadalajara, Blvd. Marcelino G.Barragán 1421, Guadalajara, Jalisco 44430, México.
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Abstract

Polycrystalline samples of the perovskites: SrPb1−xBixO3−δ (x = 0, 0.1) were prepared from the dissolution of stoichiometric amounts of Sr(NO3), Pb(NO3)2 and Bi(NO3)3 in aqueous media. The solutions were heat-dried at 75°C obtaining powder precursors. To determine the temperature of formation of these phases, thermal analyses were made on them. Calcination at 650°C for 6 h produced pure samples, which were characterized by X-ray powder diffraction. The surface microstructure of powders was analyzed by scanning electron microscopy, and showed that this preparation procedure yield micron-sized particles, which formed agglomerations. To evaluate their gas sensing behavior, the resulting powders were finely ground and mixed with acetone to form thick-films. The electrical conductivity vs. temperature of films was measured in dry air, O2 and CO2, and resulted that SrPb0.9Bi0.1O3−δ has a better sensitivity to O2 compared to SrPbO3−δ, caused by the partial substitution of lead by bismuth.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 828: Symposium A – Semiconductor Materials for Sensing , 2004 , A5.2
Copyright
Copyright © Materials Research Society 2005

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References

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