Abstract

In early structural research on borides it was not possible to determine with high accuracy the atomic positions and their fractional occupancies. The boron atoms were frequently placed in the structure from space filling considerations. In recent years, however, several highly accurate structure determinations have been carried out by single crystal diffractometry in most cases using X-rays, but in some cases using neutrons. In the present paper we shall discuss the influence of these determinations on our present understanding of the structures, compositions and microhardness of some binary borides and some solid solutions of transition elements in β—rhombohedral boron.

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