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

Abstract

Powder X-ray diffraction of [NH3(CH2)7(NH3)]MnBr4 perovskite hybrid crystallizes in the triclinic system with space group P‾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 predominates 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 (Wm) for the different phases.