Abstract
The crystal structure of Hg 0.75Mo 0.25Sr 2CuO 4.5+ δ , with δ=0.10(1), has been determined from Rietveld analysis of neutron powder diffraction data. This material crystallises in space group P4/mmm with a=3.7794(1) and c=8.8600(3) Å. The Mo cation in Hg 0.75Mo 0.25Sr 2CuO 4.5+ δ is hexavalent and is co-ordinated to four oxygen anions, forming MoO 4 2− oxyanions of near ideal tetrahedral symmetry. The partial replacement of linear HgO 2 2− units by MoO 4 2− tetrahedra is found to result in significant distortions of the neighbouring CuO 6 and SrO 8+ δ polyhedra. Doping of the CuO 2 sheets in Hg 0.75Mo 0.25Sr 2CuO 4.5+ δ is achieved by the intercalation of interstitial oxygen, with T c=54 K for δ=0.10.
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