Features of the $A$-site cation coordination polyhedra ( $A \mathrm{O}_{8}$) for $P 2_{1} / n \operatorname{SrLnMRuO} 6$ perovskites [115, 116, 120]. Evolution of (a) the first coordination-sphere's mean $A$-O bond-lengths, and (b) second coordination-sphere's mean $A$-O bond-lengths as a function of the lanthanide ionic radii ( $\AA$). Black filled rectangle stands for zinc; blue filled circle, cobalt; green star, copper; red triangle, magnesium; and, finally, purple rhombus, nickel.
Features of the A-site cation coordination polyhedra ( A \mathrm{O}_{8}) for P 2_{1} / n \operatorname{SrLnMRuO} 6 perovskites [115, 116, 120]. Evolution of (a) the first coordination-sphere’s mean A-O bond-lengths, and (b) second coordination-sphere’s mean A-O bond-lengths as a function of the lanthanide ionic radii ( \AA). Black filled rectangle stands for zinc; blue filled circle, cobalt; green star, copper; red triangle, magnesium; and, finally, purple rhombus, nickel.