Effect of addition of Ag on the microstructures and electrical properties of sol-gel derived SnO2 glass composites |
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Authors: | Haruhisa Shiomi Hiroaki Furukawa |
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Affiliation: | (1) Faculty of Engineering and Design, Department of Chemistry and Materials Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto-shi, Kyoto, 606-8585, Japan;(2) Faculty of Engineering and Design, Department of Chemistry and Materials Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto-shi, Kyoto, 606-8585, Japan |
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Abstract: | The effect of addition of Ag on the microstructure and electrical properties of sol-gel derived SnO2-glass composites was examined. Comparisons of the microstructures and electrical properties were carried out between glass composites prepared by a sol-gel method and a conventional one using glass frit. The glass composite gels and the SnO2-glass powder mixtures containing AgNO3 were calcined at 500 °C in order to decompose AgNO3 into Ag and then fired at 900 °C. In the sol-gel derived glass composites, the grain growth of Ag was suppressed and Ag particles connected mutually at the boundaries of aggregated gel particles to form three-dimensional networks. Thus, the glass composite derived by the sol-gel method showed a high electrical conductivity and a positive temperature coefficient of resistance (TCR). The highly electrical conductive paths of Ag in the glass composite were effectively formed when powder compacts were formed at a higher pressure. On the other hand, in the glass composites prepared using SnO2-glass powder mixtures, coarse-grained Ag particles were isolated in closed pores regardless of the forming pressure, and therefore did not contribute to electrical conduction in the glass composite. |
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