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When studying the color of rutile, a project sponsored by the Geophysics Branch of the O.N.R., W. A. Weyl and T. Forland∗ discovered that the blue-grey color which is characteristic for partly reduced rutile may be obtained in an oxidizing atmosphere if an occasional Ti4+ ion is replaced by a cation of a valency higher than four (Sb5+, Cb5+, W6+).
The chemical picture of the constitution of semiconductors derived in the previous paper was used as a basis for examining metal-semiconductor interfaces. It was found that the chemical composition of a semiconductor exerts a profound influence upon its ability to form a rectifier. The insulator NiO (of stoichiometric composition) which is green can be converted into a black material with semiconducting...
The electrical conductivity of silicate glasses has been examined very thoroughly by many workers and is fairly well understood, Low temperature conductivity is the result of monovalent cations, Na+, and in some instances H+ migrating through an otherwise rigid framework of SiO4 tetrahedra.
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