| Initial crystal system | orthorhombic |
| Final crystal system | tetragonal |
| Initial space group | Pna2_1 |
| Final space group | I4/mcm |
| Direction | Unknown |
| Phase transition temperature | 161.4 K |
Hysteresis: NIL
| Initial crystal system | tetragonal |
| Final crystal system | cubic |
| Initial space group | I4/mcm |
| Final space group | Pm3m |
| Direction | Unknown |
| Phase transition temperature | 330.4 K |
Hysteresis: NIL
Starting materials: Pb(CH3CO2)2, MAI
Product: Black MAPbI3 cube-shaped crystals of 1-2 mm
Description: Add aqueous solution of Pb(CH3CO2)2 drop by drop to an excess quantity of hot aqueous MAI solution and cool slowly, keeping temperature above 40 °C to prevent crystallization of (MA)3Pb6-2H2O.
Method: Adiabatic calorimetry
Description: The heat capacities were measured with a computerized adiabatic calorimeter [1, 2]. The temperature ranges of the measurement were between 13 and 365 K. The mass of the calorimetric sample was 9.3384 g.
Comment: References: [1] Tatsumi M., Matsuo T., Suga H. and Seki S., Bull. chem. Soc. Jap. 48, 3060 (1975). [2] Matsuo T. and Suga H., Thermochim. Acta 88, 149 (1985).