Preparation and Properties of Pyrolitic Boron Thermistors

Boron thermistors have been prepared by a new technique involving the chemical vapour deposition of boron on crossed molibdenum wires. The paper describes the conditions of deposition pertaining to the thermal reduction of boron trichloride in a hydrogen atmosphere and sets out the special advantages offered by the crossed-wire arrangement, which not only enables a thermistor structure (including the leads) to be obtained in a single operation, but also affords control over the final value of the resistance of the device, thus making it possible to achieve low tolerances of this parameter.