STRUCTURE, DEFECTS AND PROPERTIES OF SOME REFRACTORY BORIDES.

Abstract

Structural defects in some refractory borides are reviewed. The Ru//7B//3-type borides display fewer defects than the closely related M//7C//3 carbides. Monoborides often crystallize in domains of variable size. Point defects are common among boride structures belonging to the AlB//2 structure family. Mechanisms behind the composition changes in the homogeneity ranges of hexaborides are discussed.