・名古屋工業大学学術機関リポジトリは、名古屋工業大学内で生産された学術情報を電子的に収集・保存・発信するシステムです。 ・論文の著作権は、著者または出版社が保持しています。著作権法で定める権利制限規定を超える利用については、著作権者に許諾を得てください。 ・著者版フラグに「author」と記載された論文は、著者原稿となります。実際の出版社版とは、レイアウト、字句校正レベルの異同がある場合もあります。 ・Nagoya Institute of Technology Repository Sytem is built to collect, archive and offer electronically the academic information produced by Nagoya Institute of Technology. ・The copyright and related rights of the article are held by authors or publishers. The copyright owners' consents must be required to use it over the curtailment of copyrights. ・Textversion "Author " means the article is author's version. Author version may have some difference in layouts and wordings form publisher version.
PTC materials composed of particles of conducting graphite and insulating cristobalite-form SiO_2 or AIPO_4 were prepared by the use of silicone rubber as a binder. The PTC effect was observed exactly at the reversible phase transition point with a large thermal expansion of cristobalite (ca. 270'C in SiO_2 and ca. 230'C in AIPO_4) , and was reproducible on repeated runs. The magnitude of the PTC effect was high in composites having a middle composition between insulator and conductor in the percolation curve.