| dc.contributor | Michel, C.R., Departamento de Física, CUCEI, Universidad de Guadalajara, Blvd. Marcelino G. Barragan 1421, Guadalajara, Jalisco 44430, Mexico; Santillán, G., Departamento de Física, CUCEI, Universidad de Guadalajara, Blvd. Marcelino G. Barragan 1421, Guadalajara, Jalisco 44430, Mexico; Quino, A., Departamento de Física, CUCEI, Universidad de Guadalajara, Blvd. Marcelino G. Barragan 1421, Guadalajara, Jalisco 44430, Mexico; Chávez, A., Departamento de Física, CUCEI, Universidad de Guadalajara, Blvd. Marcelino G. Barragan 1421, Guadalajara, Jalisco 44430, Mexico | |
| dc.description.abstract | Polycrystalline samples of the perovskites: SrPb1-xBi xO3-δ (x = 0, 0.1) were prepared from the dissolution of stoichiometric amounts of Sr(NO3), Pb(NO 3)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 CO 2, and resulted that SrPb0.9Bi0.1O 3-δ a better sensitivity to O2 compared to SrPbO3-δ, caused by the partial substitution of lead by bismuth. © 2005 Materials Research Society. | |
