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A new class of critical temperature resistor (CTR) was fabricated from metal/silica glass composites. The electrical resistivity of the composite with 20 vol% of Ag filler suddenly decreased from 10^5 to 10^1 Ω・m at about 300℃, in analogy with the CTR characteristic observed in VO_2 ceramics. It was assumed that this phenomenon was due to the high thermal expansion of the conducting filler in a low-thermal-expansion matrix: as the temperature increased, the conducting filler particles expanded to come into contact with one to another, resulting in a drop of resistivity at a critical temperature. The critical temperature varied with both the kind and the amount of metal filler.
金属-シリカガラス複合体のCTR特性
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