Starting materials: PbCO3 (2.67 g, 0.01 mol), CH3(CH2)3NH3I (1.34 g, 0.0067 mol), CH3CH2NH3I (1.15 g, 0.0067 mol)
Product: FEP, AFEP, PEP
Description: Lead iodide hybrid perovskites, (BA)2,(EA)2Pb3I10, were synthesized in a concentrated HI solution (40 mL, 57%) that contained PbCO3, CH3(CH2)3NH3I, CH3CH2NH3I.
Method: Temperature-cooling, Powder X-RAY Diffraction and Differential Scanning Calorimetry (DSC)
Description: Crystals of the hydroiodic solutions were obtained via a temperature- cooling method using differential scanning calorimetry (DSC) measurements with a heating/cooling rate of 10 K/min. The DSC traced reversible thermal peaks at 322/315 K (T1) and 363/360 K (T2) in the heating/cooling mode. The preparation of the HI solutions performed at 50°C and kept at 4-6 °C above its preliminary saturated temperature. The temperature was then slowly lowered with a cooling rate of 0.5 K/day, which resulted in bulk dark-red crystals. In addition, a bright yellow solution was obtained from heating the synthesis of compound 1 in an HI solution. These crystals were then verified via powder X-ray diffraction at room temperature. The temperature dependence of the dielectric constant was measured using the double-wave method to