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(a) PXRD pattern of the MAPb(Br0.5Cl0.5)3 composition showing a complete suppression of the phase transitions. (b) Temperature dependence of the heat capacity for the x = 0, 0.5, and 1 compositions. (c) Temperature–composition phase diagram of the MAPb(Br1–xClx)3 system. Symmetry notation: C - cubic, T - tetragonal, O - orthorhombic. Reprinted with permission from ref (381). Copyright 2021 American Chemical Society.
