Fig. 1: Temperature dependences of the relative dielectric permittivity of lead halide perovskites.
From: Incipient ferroelectricity in methylammonium lead halide perovskites
The results for organic-inorganic MAPbCl3 (a), MAPbBr3 (b), MAPbI3 (c), and all-inorganic CsPbBr3 (b), measured on (001)c-oriented single crystals at different frequencies. The temperatures of phase transitions are marked by the arrows.
