Crystal structure data and refinement results, at room temperature for \mathrm{Sr}_{2} \mathrm{MSbO}_{6}; \mathrm{M}=\mathrm{Ln}(\mathrm{Nd}, \mathrm{Eu}, \mathrm{Gd}, \mathrm{Dy}, \mathrm{Ho}, \mathrm{Er}, \mathrm{Tm}, \mathrm{Yb}) and Y), from Synchrotron powder diffraction. The atomic positions and isotropic atomic displacement parameters were refined in the space group P 2_{1} / n. \mathrm{Sb} atoms occupy the site 2 \mathrm{a}(0,0,0); \mathrm{M} atoms occupy the site 2 \mathrm{ b}(0,0,1 / 2); Sr and O atoms occupy the site 4 \mathrm{e}(\mathrm{x}, \mathrm{y}, \mathrm{z}).
| Compound | \mathrm{Sr}_{2} \mathrm{NdSbO}_{6} | \mathrm{Sr}_{2} \mathrm{EuSbO}_{6} | \mathrm{Sr}_{2} \mathrm{GdSbO}_{6} | \mathrm{Sr}_{2} \mathrm{DySbO}_{6} | \mathrm{Sr}_{2} \mathrm{HoSbO}_{6} | \mathrm{Sr}_{2} \mathrm{YSbO}_{6} | \mathrm{Sr}_{2} \mathrm{ErSbO}_{6} | \mathrm{Sr}_{2} \mathrm{TmSbO}_{6} | \mathrm{Sr}_{2} \mathrm{YbSbO}_{6} | |
|---|---|---|---|---|---|---|---|---|---|---|
| Sr (4e) | x | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
| y | 0.5382(2) | 0.5338(2) | 0.5340(3) | 0.5325(3) | 0.5288(4) | 0.5270(1) | 0.5266(5) | 0.5277(4) | 0.5263(4) | |
| z | 0.2500 | 0.2500 | 0.2500 | 0.2500 | 0.2500 | 0.2500 | 0.2500 | 0.2500 | 0.2500 | |
| O1 (4e) | x | -0.7123(3) | -0.7131(3) | -0.7152(4) | -0.7130(4) | -0.7152(5) | -0.7183(5) | -0.7159(7) | -0.7181(3) | -0.7148(5) |
| y | 0.2066(1) | 0.2074(3) | 0.2095(4) | 0.2073(4) | 0.2095(5) | 0.2126(5) | 0.2102(7) | 0.2123(3) | 0.2091(5) | |
| z | -0.0414(1) | -0.0384(2) | -0.0374(3) | -0.0345(3) | -0.0333(5) | -0.0360(1) | -0.0317(7) | -0.0316(3) | -0.0293(5) | |
| O2 (4e) | x | -0.4171(2) | -0.4231(3) | -0.4251(3) | -0.4309(4) | -0.4332(6) | -0.4279(2) | -0.4364(8) | -0.4366(4) | -0.4412(6) |
| y | 0.5152(2) | 0.5135(8) | 0.5135(3) | 0.5128(2) | 0.5122(3) | 0.5114(8) | 0.5112(5) | 0.5117(2) | 0.5111(3) | |
| z | -0.2528 | -0.2528 | -0.2528 | -0.2528 | -0.2528 | -0.2528 | -0.2528 | -0.2528 | -0.2528 | |
| O3 (4e) | x | -0.2066(3) | -0.2074(2) | -0.2095(4) | -0.2073(3) | -0.2095(5) | -0.2126(5) | -0.2102(7) | -0.2123(3) | -0.2091(5) |
| y | 0.2876(3) | 0.2868(1) | 0.2847(4) | 0.2869(4) | 0.2847(5) | 0.2816(5) | 0.2840(7) | 0.2818(3) | 0.2851(5) | |
| z | 0.0414(2) | 0.0384(4) | 0.0374(3) | 0.0345(3) | 0.0333(5) | 0.0360(4) | 0.0317(7) | 0.0316(3) | 0.0293(5) | |
| B_{\text {iso }}\left({ }^{2}\right) | M | 0.26(1) | 0.68(1) | 0.28(5) | 0.79(3) | 0.43(7) | 0.42(1) | 0.38(8) | 0.64(1) | 0.43(3) |
| Sb | 0.30(2) | 0.28(2) | 0.20(4) | 0.47(1) | 0.49(1) | 0.40(5) | 0.30(1) | 0.28(5) | 0.26(1) | |
| Sr | 0.79(3) | 0.86(1) | 0.80(2) | 1.04(7) | 0.65(8) | 0.63(1) | 0.87(2) | 0.72(3) | 1.04(8) | |
| O1, O2, O3 | 1.10(2) | 1.06(3) | 0.88(6) | 1.23(2) | 0.91(2) | 0.97(8) | 1.10(1) | 1.08(1) | 1.08(1) | |
| Cell parameters | a(\AA) | 5.8818(1) | 5.8573(8) | 5.8455(1) | 5.8455(8) | 5.8231(1) | 5.8178(5) | 5.8108(1) | 5.8029(1) | 5.7945(1) |
| b(\AA) | 5.9595(1) | 5.9121(8) | 5.8971(8) | 5.8608(7) | 5.8486(1) | 5.8436(4) | 5.8350(1) | 5.8192(8) | 5.8074(1) | |
| c(\AA) | 8.3645(1) | 8.3155(1) | 8.2967(1) | 8.2583(1) | 8.2483(1) | 8.2410(8) | 8.2303(1) | 8.2130(1) | 8.1992(1) | |
| \beta\left({ }^{\circ}\right) | 90.28(1) | 90.24(1) | 90.23(1) | 90.19(1) | 90.16(1) | 90.17(1) | 90.16(1) | 90.14(1) | 90.12(1) | |
| \mathrm{V}\left(\AA^{3}\right) | 293.19(1) | 287.96(1) | 286.00(1) | 282.05(1) | 280.91(1) | 280.17(1) | 279.06(1) | 277.34(1) | 275.94(1) | |
| Modes amplitudes | \mathrm{GM}^{4+} | 1.42(2) | 1.31(5) | 1.29(2) | 1.20(1) | 1.21(8) | 1.21(7) | 1.15(6) | 1.10(1) | 1.02(4) |
| \mathrm{X}^{3+} | 1.02(1) | 0.97(2) | 0.96(1) | 0.90(7) | 0.87(5) | 0.82(4) | 0.81(2) | 0.80(1) | 0.71(2) | |
| \mathrm{X}^{5+} | 0.56(4) | 0.48(1) | 0.45(1) | 0.45(4) | 0.41(2) | 0.38(3) | 0.35(1) | 0.35(1) | 0.29(6) |