Acta Crystallographica Section B

Structural Science

Volume 55, Part 6 (December 1999)

research papers

Acta Cryst. (1999). B55, 849-852 [ doi:10.1107/S0108768199005194 ]

The crystal structure of Tm₅Re₂O₁₂

H. Ehrenberg, T. Hartmann, G. Wltschek, H. Fuess, W. Morgenroth and H.-G. Krane

Abstract: The crystal structure of Tm₅Re₂O₁₂, pentathulium dirhenium dodecaoxide, was determined by synchrotron diffraction on a reticular merohedral twin, revealing space group C2/m with a = 12.3717 (7), b = 5.6744 (3), c = 7.4805 (4) Å, [beta] = 107.816 (2)° and Z = 2. Distorted ReO₆ octahedra form chains with alternating rhenium-rhenium distances of 2.455 (1) and 3.219 (1) Å. Early reports on Ln₂ReO₅ compounds are critically reviewed in the light of our results for Tm₅Re₂O₁₂.

Keywords: Pentathulium dirhenium dodecaoxide; twinning.