Abstract
Two boron rich phases were successfully synthesized by borothermal reduction of Yb oxide under vacuum. For the new boron-poorer phase, the single phase was established at around [B]/[Yb] = 43.3 at 1500°C (Pbam space group; YB50-type; a = 16.5811(5)Å, b = 17.5950(5)Å, c = 9.4647(3)Å; powder X-ray diffraction; Rietveld refinement). The crystal structure of the boron-richer phase ([B]/[Yb] = 56.7) has been elucidated by single crystal X-ray diffraction (Fm3¯c space group; YB66-type; a = 23.3587(6)Å). Powder X-ray diffraction data of the alloy YbB~70 annealed at 1825°C yielded, along with the YB66-type compound (a = 23.3691(2)Å), β-rh B as a secondary phase (R3¯m space group, a = 10.9298(3)Å, c = 23.875(1)Å), for which the solubility of Yb was found to be below 1at%. The Yb atoms in β-rh B occupy the D and E voids. Both YbB43.3 (YB50-type) and YbB56.7 (YB66-type) feature complicated boron atom frameworks which exhibit shorter B-B separations both within and between boron clusters as compared to those observed for prototype structures.
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