Figure 10.

(a) Tentative temperature–composition phase diagram of the mixed MA_1–xDMA_xPbBr₃ system. Symmetry notation: C - cubic, T - tetragonal, O - orthorhombic. (b) Reciprocal space reconstruction (hk0 layer) of the x = 0.21 single crystal sample measured at 100 K indicating cubic symmetry. (c) Temperature dependence of the broadband dielectric response of the x = 0.21 single crystal sample. (d) Low-frequency dependence of ε″ at selected temperatures of the same sample. Solid curves are the best fits to the Cole–Cole relaxation model. Adapted with permission from ref (164). Copyright 2020 Springer Nature.