Dielectric, conductivity relaxation, conduction mechanisms and thermal behavior in 2-D Ruddlesden-Popper manganese bromide perovskite hybrid

Powder X-ray diffraction of [NH3(CH2)(7)(NH3)]MnBr4 perovskite hybrid crystallizes in the triclinic system with space group P over line 1. Five phase transitions are identified by differential scanning calorimetric technique. Dielectric and AC conductivity measurements, in the temperature range (300-400) K and frequency range (0.06 kHz- 60 kHz) are in good agreement with DSC phase transitions. Proton conduction and bromide ion migration pre-dominates in the intermediate and high temperatures respectively. The frequency dependence of the conductivity was fitted according to super-linear power law. Conduction mechanism is different in the different phases, (OLPT) and (NSPT) tunneling dominate in the temperature range (300-334) K, whereas correlated barrier hopping (CBH) is the mechanism at higher temperatures, with different carrier binding energies (W-m) for the different phases.

Automated summary

The powder X-ray diffraction and differential scanning calorimetric techniques were used to investigate the crystal structure, phase transitions, and conductivity properties of [NH3(CH2)(7)(NH3)]MnBr4 hybrid perovskite. The results show that proton conduction and bromide ion migration dominate the conductivity at different temperature ranges, and the frequency dependence of the conductivity follows a super-linear power law. The carrier binding energies also vary between different phases.