Acta Crystallographica Section E (Dec 2011)

The matlockite-type praseodymium(III) oxide bromide PrOBr

  • Pia Talmon-Gros,
  • Christian M. Schurz,
  • Thomas Schleid

DOI
https://doi.org/10.1107/S1600536811048227
Journal volume & issue
Vol. 67, no. 12
pp. i74 – i74

Abstract

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The crystal structure of the praseodymium(III) oxide bromide, PrOBr, can be best described with layers of agglomerated square antiprisms [PrO4Br4]9−. These slabs are stacked along the c axis and linked via two different secondary contacts between Pr3+ and Br−. The Pr3+ cations occupy the Wyckoff site 2c with 4mm symmetry and carry four O2− anions as well as four primary Br− anions, yielding a coordination number of 8. While the Br− anions exhibit the same site symmetry as the Pr3+ cations, the oxide anions are located at the Wyckoff position 2a with site symmetry overline{4}m2 and have four Pr3+ cations as neighbours, defining a tetrahedron.