SrHgO2: Ein oxomercurat mit delafossitstruktur

Abstract

For the first time, single crystals of SrHgO₂ have been prepared by a high pressure oxidation technique. X-ray investigations indicate that the crystals have trigonal symmetry, space group D₃⁶-P3₂21 (no. 154), with $\text{a = 3.833(3)}\text{a}\text{̊}\text{A}$, $\text{c = 18.990(15)}\text{A}\text{̊}$ and Z = 3. Hg²⁺ has a coordination number of two, while Sr²⁺ is surrounded by six oxygen ions. Two-dimensional layers of edge-linked SrO₆ octahedra are connected by O-Hg-O dumb-bells. SrHgO₂ belongs to the delafossite-type structure.