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Lacerda Jr, W. W. et al. Electrical chracterization of tin dioxine based ceramics doped with Mn, Sb and Cr. CONGRESSO BRASILEIRO DE CERÂMICA, 43, 1999, Florianópolis, SC, CONGRESSO DE CERÂMICA DO MERCOSUL, 4, 1999, Florianópolis, SC. Artigo Técnico.
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Abstract

SnO2-based ceramics were investigated as to their electrical properties, specifically those related to the non-linear behavior found in varistor devices. SnO2 systems were prepared containing additives to promote densification (Mn or Cu), electrical conductivity (Sb) and the varistor effect (Cr). Surface area measurements and X-ray diffraction analysis were used to characterize the precursor powders. Electrical measurements ( I-V plots) of the sintered compacts were carried out and the non-linear behavior was observed for all studied systems. Copper doped systems are more conductive and have lower non-linear coefficients and breakdown fields than those doped with manganese. Increasing antimony concentration yields a more conductive ceramics. The effect of Cr addition (0.05% mol) was small and different for systems containing Mn and Cu. The Sn-0.7%Mn-0.15%Sb-0.05%Cr system presented the highest non-linear coefficient value, á, around 13. Therefore, the main non-linear effect observed in the studied ceramics comes mainly from manganese and antimony. Keywords: tin dioxide, varistor, manganese, antimony, chromium.
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