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(a) Temperature–composition phase diagram of the mixed MA1–xCsxPbBr3 system. Phase separation occurs for x ≥ 0.4. (b) Neutron powder diffraction data of the x = 0.2 composition showing the reentrant phase transition (arrow). (c) Fraction of the MA cations participating in the reorientation around the C4 symmetry axis (inset) as extracted from the QENS data for different Cs concentrations. Reprinted (adapted) with permission from ref (163). Copyright 2017 American Chemical Society.
