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11.7 T Solid-state 87Rb echo-detected MAS (20 kHz, 298 K) spectra of various (Cs/Rb/MA/FA)Pb(Br/I)3 systems. The corresponding 100 K 13C CP MAS spectra of a–c, e, f, and j show only one FA signal corresponding to it being in a 3D perovskite environment (Figure S11).
