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The crystal structure of Mg 2 B 25 , dimagnesium penta­eicosa­boride, was reexamined from single-crystal X-ray diffraction data. The structural model previously reported on the basis of powder X-ray diffraction data [Giunchi  et al.  (2006  ▶ ).  Solid State Sci.   8 , 1202–1208] has been confirmed, although a much higher precision refinement was achieved, leading to much smaller standard uncertainties on bond lengths and refined occupancy factors. Moreover, all atoms were refined with anisotropic displacement parameters. Mg 2 B 25  crystallizes in the β-boron structure type and is isostructural with other rhombohedral compounds of the boron-rich metal boride family. Magnesium atoms are found in inter­stitial sites on special positions (two with site symmetry . m , one with .2 and one with 3 m ), all with partial occupancies.

Redetermination of Mg2B25 based on single-crystal X-ray data

Redetermination of Mg₂B₂₅ based on single-crystal X-ray data