Rotational and translational distortions of the crystal structure of the Sr2HrRuO6 (Hr = Ho, Dy, Gd, Eu) complex perovskites

► Crystal structure of Sr2HrRuO6 (Hr = Ho, Dy, Gd, Eu) as a function of Hr ionic radius. ► XRD patterns of the Sr2HrRuO6 correspond to the monoclinic P21/n (#14) space group. ► Ru+5O6 and Hr+3O6 octahedra alternately arranged in two interleaving fcc sublattice. ► Cell parameters and tilt angles increases as the Hr-cations ionic radius increases. ► Mismatch of Sr2HrRuO6 ionic radius yields large distortion from the ideal symmetry.