From tin oxalate to (Fe, Co, Nb)-doped SnO2: Sintering behavior, microstructural and electrical features |
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| Authors: | R. Parra L.A. Ramajo J.A. Varela |
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| Affiliation: | a Instituto de Investigaciones en Ciencia y Tecnología de Materiales (INTEMA, CONICET-UNMdP), J.B. Justo 4302, B7608FDQ Mar del Plata, Argentina
b Instituto de Química, São Paulo State University (UNESP), Rua F. Degni s/n, 14800-900 Araraquara, SP, Brazil |
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| Abstract: | Highly reactive SnO2-doped nanocrystalline powders with average particle size of 20 nm and specific surface areas above 30 m2/g were obtained through the polymeric precursor method with tin oxalate (SnC2O4) as a chloride-free precursor for SnO2. Powders and sintered discs were characterized by means of X-ray powder diffraction (XRD), SEM and TEM. The influence of Co and Fe on the microstructure development and on the electrical properties of dense SnO2-based ceramics was studied. Co and Fe species were found to decrease in more than 70 °C the sintering temperature of SnO2 with respect to mixed oxide procedures. Secondary phases enriched in Co and Fe were detected and identified in sintered samples with XRD. Current-voltage curves were registered for electrical characterization. Doping with iron increased the electrical breakdown field and a nonlinearity coefficient of 20 was achieved. |
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| Keywords: | A. Ceramics A. Semiconductors B. Chemical synthesis D. Defects D. Electrical properties |
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