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The structure of the compounds La2MIrO6 is a monoclinic deformation of the perovskite-like GdFeO3-type (space group P21/n) with complete ordering between iridium and M for M = Mg, Co, Ni, and Zn. These compounds are isomorphous with La2NiRuO6. The unit cell dimensions compare to those of the cubic perovskite as am ≈ bm ≈ ac2, cm, ≈ 2ac, β ≈ 90°;. The structure has been determined by Rietveld refinement...