From tin oxalate to (Fe, Co, Nb)-doped SnO{sub 2}: Sintering behavior, microstructural and electrical features
- Instituto de Investigaciones en Ciencia y Tecnologia de Materiales (INTEMA, CONICET-UNMdP), J.B. Justo 4302, B7608FDQ Mar del Plata (Argentina)
- Instituto de Quimica, Sao Paulo State University (UNESP), Rua F. Degni s/n, 14800-900 Araraquara, SP (Brazil)
Highly reactive SnO{sub 2}-doped nanocrystalline powders with average particle size of 20 nm and specific surface areas above 30 m{sup 2}/g were obtained through the polymeric precursor method with tin oxalate (SnC{sub 2}O{sub 4}) as a chloride-free precursor for SnO{sub 2}. 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 SnO{sub 2}-based ceramics was studied. Co and Fe species were found to decrease in more than 70 deg. C the sintering temperature of SnO{sub 2} 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.
- OSTI ID:
- 21195016
- Journal Information:
- Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 12 Vol. 43; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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