Figure 7.

Halide dynamics in MASnBr₃ from multi-field variable-temperature ¹¹⁹Sn solid-state MAS NMR. (a) variable–temperature (308–474 K) ¹¹⁹Sn spectra at 17.6 T. All spectra were acquired using the same number of scans (4096) and are quantitative. The spectrum after thermal decomposition corresponds to MA₂SnBr₆ (Figure 4b) with traces of SnO₂ as discussed above. (b) Arrhenius plot of the ¹¹⁹Sn T₁ relaxation data at 4.7 T (blue), 9.4 T (red), and 17.6 T (green). The linear fits are indicated by dotted lines, and the numerical values are given in Table S2.