fig3

Figure 3. Temperature-dependent lattice constants for the tetragonal (pseudo-cubic) and cubic unit cell for (A) MAPbI₃ (cubic at 350 K from Whitfield et al.^[36]) and (B) MAPbBr₃ based on the results of Schuck et al.^[6] and Weadock et al.^[7]. In both cases, the linear thermal expansion coefficients in direction [100] [positive thermal expansion (PTE)] and in direction [001] [negative thermal expansion (NTE)] are also given. Adapted with permission from Schuck et al.^[6]. Copyright 2022 American Chemical Society.