SnO_2-ガラス系複合体の微細構造及び電気的特性に及ぼすSnO_2及びガラス粒子径の影響

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The effects of the particle size of SnO_2 and glass on the densification behavior, the microstructure and the electrical properties of SnO_2-glass composites were examined. Moreover, the relationship between the electrical properties of the glass composites and the particle dispersion of SnO_2 in a glass matrix was discussed following quantitative analysis of SnO_2 particle dispersion by computer-assisted image analysis on SEM photographs. The results are summarized as follows : (1)When coarse grained SnO_2 particles were used, the densification of the glass composites proceeded at low firing temperatures. Therefore, the use of coarse SnO_2 particles was useful to get the glass composite having a high electrical conductivity and a small negative temperature coefficient of resistance(TCR)at low firing temperatures. However, after the completion of densification, the glass composite prepared using fine SnO_2 particles showed a higher electrical conductivity and a smaller negative TCR because SnO_2 particles were more highly crowded in a glass matrix and thus the SnO_2 interparticle spacings were smaller than those of the sample dispersed with coarse SnO_2 particles. (2)When fine glass particles were used, the densification of the glass composites proceeded at low firing temperatures and the particle dispersion of SnO_2 in a glass matrix was homogeneous. Besides, the glass composite prepared using fine glass particles showed a high electrical conductivity and a small negative TCR at low firing temperatures. On the other hand, at high firing temperature, the glass composite having a higher conductivity and a smaller negative TCR was obtained when coarse glass particles were used, because the densely aggregated SnO_2 particles formed highly conductive networks in a glass matrix.
1998-02-01

SnO_2-ガラス系複合体の微細構造及び電気的特性に及ぼすSnO_2及びガラス粒子径の影響

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