| Initial crystal system | unknown |
| Final crystal system | unknown |
| Initial space group | unknown |
| Final space group | unknown |
| Direction | both |
| Phase transition temperature | 148.35 (±0.05) K |
Hysteresis: NIL
| Initial crystal system | unknown |
| Final crystal system | unknown |
| Initial space group | unknown |
| Final space group | unknown |
| Direction | both |
| Phase transition temperature | 154.2 (±0.1) K |
Hysteresis: NIL
| Initial crystal system | unknown |
| Final crystal system | cubic |
| Initial space group | unknown |
| Final space group | cubic |
| Direction | both |
| Phase transition temperature | 235.1 (±0.2) K |
Hysteresis: NIL
Starting materials: HBr, CH3NH2, Pb(NO3)2
Product: MAPbBr3 Single-crystal
Description: Add concentrated HBr to neutralize 20 g of 40% CH3NH2 aqueous solution. Add 7.1 g (0.021 mol) of Pb(NO3)2 solution drop-wise under vigorous stirring at 100°C to the concentrated CH3NH3Br solution. Red organic crystals form while dripping in the solution. Cool the solution to room temperature and filter out the crystals. Wash crystals firstly with n-butanol and then with benzene; subsequently dry crystals in vacuum. Yield: 9.5 g.
Comment: Synthesis references: [1] Canadian Journal of Chemistry, 1987, 65(5): 1042-1046 https://doi.org/10.1139/v87-176 [2] D. WEBER. Z. Naturforsch. 33b, 1443 (1978).
Method: Adiabatic calorimetry
Description: The heat capacities were measured in an adiabatic calorimeter from 30 to 300 K, using sample masses of 12.8235 g MAPbBr3. Refer to Page 414 Table 1.