Main bond distances ( \AA) and selected angles ( { }^{\circ}) for \mathrm{Sr}_{2} \mathrm{SmSbO}_{6} and \mathrm{Sr}_{2} \mathrm{LaSbO}_{6} from XRPD at room temperature.
| \mathrm{Sr}_{2} \mathrm{SmSbO}_{6} | \mathrm{Sr}_{2} \mathrm{LaSbO}_{6} | |
|---|---|---|
| Sb-O1 ( \times 2 ) | 1.993(2) | 2.000(7) |
| \mathrm{Sb}-\mathrm{O} 2(\times 2) | 2.002(7) | 2.010(8) |
| Sb-O3 (\times 2) | 1.998(6) | 2.011(2) |
| Average distance | 1.998(5) | 2.007(3) |
| Predicted distance | 2.009 | 2.009 |
| B-O1 ( \times 2 ) | 2.324(2) | 2.418(7) |
| B-O2 (×2) | 2.342(7) | 2.420(8) |
| B-O3 ( \times 2 ) | 2.331(6) | 2.414(2) |
| Average distance | 2.332(5) | 2.417(3) |
| Predicted distance | 2.344 | 2.428 |
| Sr-O1 ( \times 1 ) | 2.965(2) | 2.715(7) |
| Sr-O1 (\times 1) | 2.429(2) | 2.309(7) |
| Sr-O1 ( \times 1 ) | 2.849(2) | 3.167(7) |
| Sr-O2 (\times 1) | 2.698(7) | 2.614(8) |
| Sr-O2 (\times 1) | 2.471(7) | 2.391(8) |
| Sr-O2 (\times 1) | 3.115(7) | 3.239(7) |
| Sr-O3 (\times 1) | 2.603(7) | 2.637(8) |
| Sr-O3 ( \times 1 ) | 2.466(3) | 2.330(5) |
| Average distance | 2.699(6) | 2.676(3) |
| Predicted distance | 2.631 | 2.631 |
| Sb-O1-B ( \times 2 ) | 149.1(5) | 140.8(3) |
| \mathrm{Sb}-\mathrm{O} 2-\mathrm{B}(\times 2) | 146.6(7) | 140.0(3) |
| Sb-O3-B ( \times 2 ) | 147.4(2) | 140.1(7) |
| <\mathrm{Sb}-\mathrm{O}-\mathrm{B}> | 147.7 | 140.3 |