Abstract
During the investigation of the BaO-HgO-CuO system, a new polymorph of BaHgO2 was obtained. This phase was characterized by X-ray powder diffraction, scanning electron microscopy, and EDS analysis. As the SrHgO2 and CaHgO2 counterparts, it crystallizes with the 3R delafossite structure with cell parameters a = 4.097(1), c = 19.348(2), space group R3̄m, and Z = 3. It is also shown that the distortion from the 3R delafossite structure, reported for SrHgO2, might be the effect of a merohedral twinning due to stacking faults.
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