Two-Step Positive Temperature Coefficient of Resistivity on Some Semiconducting BaTiO₃ Composite Ceramics

Printed graphene films with positive temperature coefficient of resistivity

0.5μm thick graphene films printed on plastic substrates exhibit metallic type conduction with a positive value of 1.5 × 10K for the temperature coefficient of resistance over the temperature range from 260K to 330K . The crystallites of approximately 6.5 nm in their average size in the film are found from the X-Ray diffraction pattern to be oriented preferentially along [002] plane. © 2016 Els...

Approximate theory of temperature coefficient of resistivity of amorphous semiconductors

In this paper, we develop an approximate theory of the temperature coefficient of resistivity (TCR) and conductivity based upon the recently proposed microscopic response method. By introducing suitable approximations for the lattice dynamics, localized and extended electronic states, we produce explicit forms for the conductivity and TCR, which depend on easily accessible material parameters. ...

Spark Plasma Sintering of Negative Temperature Coefficient Thermistor Ceramics

Unipolar memristive Switching in Bulk Negative Temperature Coefficient Thermosensitive Ceramics

A memristive phenomenon was observed in macroscopic bulk negative temperature coefficient nickel monoxide (NiO) ceramic material. Current-voltage characteristics of memristors, pinched hysteretic loops were systematically observed in the Ag/NiO/Ag cell. A thermistor-based model for materials with negative temperature coefficient was proposed to explain the mechanism of the experimental phenomen...

Positive temperature coefficient thermistors based on carbon nanotube/polymer composites

In order to explore availability of carbon nanotube (CNT)-based positive temperature coefficient (PTC) thermistors in practical application, we prepared carbon nanotube (CNT) filled high density polyethylene (HDPE) composites by using conventional melt-mixing methods, and investigated their PTC effects in details. The CNT-based thermistors exhibit much larger hold current and higher hold voltag...