Abstract
The Fe 3C-type structure occurs in the phases Nd 4Rh, Gd 3Rh, Y 3Rh and Er 3Rh. The atomic positional parameters in the Pnma space group are: 4Er in 4(c) 0.021, 0.250, 0.138 B 1 = 2.0 A ̊ 2 8Er in 8(d) 0.180, 0.061, 0.667 B 2 = 2.0 A ̊ 2 4Rh in 4(c) 0.389, 0.250, 0.937 B 3 = 0.5 A ̊ 2 Phases with the Ln 7Rh 3 stoichiometry in the GdRh, YRh and ErRh systems possess the Th 7Fe 3-type structure. The same structure occurs in the alloys of the light rare earths, La, Ce and Nd at the Ln 3Rh stoichiometry. Unlike LaRh 3 and NdRh 3, CeRh 3 crystallizes in the Cu 3Au-type structure. It is shown that electronic factors rather than the size factor play prominent roles in stabilizing these structures in the rare-earth alloys.
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