New Ternary R-Phases with Silicon

Abstract

THE R-phase was first found¹ in the chromium–molybdenum–cobalt ternary system. Its crystal structure has been determined by Shoemaker et al.². Additional R-phases were later found in the molybdenum–manganese–cobalt and molybdenum–manganese–iron ternary systems³, as well as in the titanium–manganese binary system⁴. Recently, in the investigation of several ternary systems with silicon a number of new R-phases have been identified. Table 1 gives the approximate composition and the lattice parameters of these new R-phases: