See all entries for this property (6 total)
| Initial crystal system | unknown |
| Final crystal system | cubic |
| Initial space group | Unknown |
| Final space group | Pm3m |
| Direction | Both |
| Phase transition temperature | 227.0 (±5.0) K |
Hysteresis: NIL
| Initial crystal system | unknown |
| Phase transition temperature | K |
Starting materials: HBr, CH3NH2, Pb(NO3)2
Product: Partially deuterated MAPbBr3
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 CH3NH2Br 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. Partially N-deuterated samples required for the NMR studies were prepared using D-containing solutions. Refer to Page 413 Experimental.
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: 2H and 14N NMR
Description: Measurements were carried out at 8.48 T with a Nicolet 360NB spectrometer using a broad band (16-58 MHz) variable-temperature 10 mm probe supplied by Nicolet. The 2-H and 14-N frequencies were 55.427 and 26.083 MHz, respectively. Refer to Page 414 Results section Existence of transitions subsection.
See all entries for this property (5 total)
| Initial crystal system | unknown |
| Final crystal system | cubic |
| Initial space group | unknown |
| Final space group | cubic |
| Direction | both |
| Phase transition temperature | 178.0 (±5.0) K |
Hysteresis: NIL
Starting materials: HCl, CD3NH2, PbCl2
Product: CD3NH3PbCl3 crystals
Description: Primarily referenced the methods of [1] and [2]. The synthesis of MAPbBr3 in ref [2] was modified to prepare CD3NH3PbCl3.
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: 2H and 14N NMR
Description: Measurements were carried out at 8.48 T with a Nicolet 360NB spectrometer using a broad band (16-58 MHz) variable-temperature 10 mm probe supplied by Nicolet. The 2-H and 14-N frequencies were 55.427 and 26.083 MHz, respectively. Refer to Page 414 Results section Existence of transitions subsection.
See all entries for this property (6 total)
| 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.
See all entries for this property (5 total)
| Initial crystal system | unknown |
| Final crystal system | unknown |
| Initial space group | unknown |
| Final space group | unknown |
| Direction | both |
| Phase transition temperature | 171.49 (±0.02) K |
Hysteresis: NIL
| Initial crystal system | unknown |
| Final crystal system | cubic |
| Initial space group | unknown |
| Final space group | Pm3m |
| Direction | both |
| Phase transition temperature | 177.36 (±0.03) K |
Hysteresis: NIL
Starting materials: HCl, CH3NH2, PbCl2
Product: MAPbCl3 Single-crystal
Description: Primarily referenced the methods of [1] and [2]. The synthesis of MAPbBr3 in ref [2] was modified to prepare MAPbCl3.
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 345 K, using sample masses of 14.6883 g MAPbCl3. Refer to Page 414 Table 1.
See all entries for this property (20 total)
| Initial crystal system | unknown |
| Final crystal system | unknown |
| Initial space group | unknown |
| Final space group | unknown |
| Direction | both |
| Phase transition temperature | 168.0 K |
Hysteresis: NIL
| Initial crystal system | unknown |
| Phase transition temperature | K |
Starting materials: HI, CH3NH2, Pb(NO3)2
Product: Partially deuterated MAPbI3
Description: Add concentrated HI 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 CH3NH2I solution. Organic crystals form while dripping in the solution. Cool the solution to not below 40°C and filter out the crystals. Wash crystals firstly with n-butanol and then with benzene; subsequently dry crystals in vacuum. Partially N-deuterated samples required for the NMR studies were prepared using D-containing solutions. Refer to Page 413 Experimental.
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: 2H and 14N NMR
Description: Measurements were carried out at 8.48 T with a Nicolet 360NB spectrometer using a broad band (16-58 MHz) variable-temperature 10 mm probe supplied by Nicolet. The 2-H and 14-N frequencies were 55.427 and 26.083 MHz, respectively. Refer to Page 414 Results section Existence of transitions subsection.