See all entries for this property (20 total)
| Initial crystal system | tetragonal |
| Final crystal system | orthorhombic |
| Initial space group | Unknown |
| Final space group | Unknown |
| Direction | Cooling |
| Phase transition temperature | 157.0 K |
Hysteresis: 3
Starting materials: HI (conc), PbAc2, CH3NH3+
Product: Black MAPbI3 Crystals
Description: Precipitate product from a concentrated aqueous solution of hydroiodic acid containing lead(II) acetate and a respective amount of CH3NH3+ solution. The two ends of the sample holder were held at 55 and 42 °C respectively to induce the saturation of the solute at the low temperature part of the solution. After 24 h submillimeter sized crystals appeared in the solution.
Comment: Both large and small crystals were grown. Large MAPbI3 crystals with 3 x 5 mm silver-gray mirror-like facets were grown after 7 days [Figure 1]. Smaller crystals were ground in a mortar and pressed together to obtain a mechanically stable polycrystalline sample [Figure 2].
Method: Thermocouple: Temperature dependence of thermal conductivity
Description: Conducted for 3 samples. Swept down from 310 K to 25 K. Using a steady-state method using calibrated stainless steel as reference sample (Page 2491 Figure 5). Refer to Page 2489 Figure 4.
Comment: PC samples the structural transition is smeared over a wider temperature range, corresponding to approximately 8 K.
See all entries for this property (20 total)
| Initial crystal system | tetragonal |
| Final crystal system | orthorhombic |
| Initial space group | Unknown |
| Final space group | Unknown |
| Direction | Cooling |
| Phase transition temperature | 159.5 K |
Hysteresis: 1.5
Starting materials: HI (conc), PbAc2, CH3NH3+
Product: Black MAPbI3 Crystals
Description: Precipitate product from a concentrated aqueous solution of hydroiodic acid containing lead(II) acetate and a respective amount of CH3NH3+ solution. The two ends of the sample holder were held at 55 and 42 °C respectively to induce the saturation of the solute at the low temperature part of the solution. After 24 h submillimeter sized crystals appeared in the solution.
Comment: Both large and small crystals were grown. Large MAPbI3 crystals with 3 x 5 mm silver-gray mirror-like facets were grown after 7 days [Figure 1]. Smaller crystals were ground in a mortar and pressed together to obtain a mechanically stable polycrystalline sample [Figure 2].
Method: Thermocouple: Temperature dependence of thermal conductivity
Description: Conducted for 3 samples. Swept down from 310 K to 25 K. Using a steady-state method using calibrated stainless steel as reference sample (Page 2491 Figure 5). Refer to Page 2489 Figure 4.
Comment: For the SC samples the width of this dip is only 2 K.