Acta Crystallographica Section C

Crystal Structure Communications

Volume 61, Part 3 (March 2005)

inorganic compounds


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Acta Cryst. (2005). C61, i29-i31    [doi:10.1107/S0108270104030446]

High-pressure syntheses of [alpha]-RE2B4O9 (RE = Sm, Ho), with a structure type displaying edge-sharing BO4 tetrahedra

H. Emme and H. Huppertz

Abstract: The compounds [alpha]-RE2B4O9, with RE = Sm (disamarium tetraborate) and Ho (diholmium tetraborate), were synthesized under conditions of high pressure and high temperature in a Walker-type multianvil apparatus, at 7.5  GPa and 1323  K for [alpha]-Sm2B4O9 and at 10  GPa and 1323  K for [alpha]-Ho2B4O9. The crystal structures were determined from single-crystal X-ray diffraction data collected at room temperature. The structures are isotypic with the already known [alpha]-RE2B4O9 (RE = Eu-Dy) phases, displaying the new structural motif of edge-sharing BO4 tetrahedra next to the known motif of corner-sharing BO4 tetrahedra. As the end members of this isotypic series, the two title compounds mark the borders of the stability field of the appearance of edge-sharing BO4 tetrahedra.

Formula: Sm2B4O9 and Ho2B4O9

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