Anomalous Negative Temperature Coefficient of Resistivity of BaTiO₃

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. ...

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...

A New Structure for Direct Measurement of Temperature Based on Negative Temperature Coefficient Thermistor and Adaptive Neuro-fuzzy Inference System

Thermistors are very commonly used for narrow temperature-range high-resolution applications, such as in medicine, calorimetry, and near ambient temperature measurements. In particular, Negative Temperature Coefficient (NTC) thermistor is very inexpensive and highly sensitive, whose sensing temperature range and sensitivity are highly limited due to the intrinsic nonlinearity and self-heating p...

Spark Plasma Sintering of Negative Temperature Coefficient Thermistor Ceramics

Theory of temperature coefficient of resistivity: Application to amorphous Si and Ge

By invoking the microscopic response method in conjunction with a reasonable set of approximations, we obtain new explicit expressions for the electrical conductivity and temperature coefficient of resistivity (TCR) in amorphous semiconductors, especially a-Si:H and a-Ge:H. The predicted TCR for n-doped a-Si:H and a-Ge:H is in agreement with experiments. The conductivity from the transitions fr...