Abstract

THE Hall effect of the so-called electronic semiconductors is usually found to be comparatively very large. All the semiconductors investigated up to the present time obey this rule, with the exception of lead sulphide (PbS), for which the experimental data vary from one sample to another. For example, according to van Aubel1 and Heaps,2 chemically pure lead sulphide has a very small Hall coefficient, while the Hall constant of the natural lead sulphide (galena) may (according to investigations by A. Smith3 and Heaps2 reach values as large as 254.

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