fig3

On the thermal expansion of the tetragonal phase of MAPbI<sub>3</sub> and MAPbBr<sub>3</sub>

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.

Microstructures
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