Abstract
Heterogeneous materials composed of conducting YBa 2Cu 3O 7−x particles randomly dispersed inside an insulating polyethylene matrix were prepared. The resistivity of the materials was measured as a function of temperature between 293 K and 410 K. A large positive temperature coefficient (PTC) of resistance was observed near 404 K, and was a maximum of 9 orders of magnitude for the specimen containing 30 vol.% YBa 2Cu 3O 7−x. The mechanism of the PTC effect in the materials is related to the percolation behaviour of the YBa 2Cu 3O 7−x-polyethylene composites and the thermal expansion of the polyethylene matrix.
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