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(a) Variation of the lattice parameters with temperature of the MA0.8GA0.2PbI3 system as determined from the XRD data. (b–d) Temperature dependence of the real part of the complex dielectric permittivity ε′ of the MA1–xGAxPbI3 pellet samples at frequencies between 10 kHz and 1 MHz. Reprinted with permission from ref (355). Copyright 2022 Royal Society of Chemistry.
