Investigation of structural, morphological, and electrical conductivity study for understanding transport mechanisms of perovskite CH3NH3HgCl3
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Date
29.03.2023Author
Imen GharbiAbderrazek Oueslati
Ayten Ateş
Abdelfattah Mahmoud
Mustapha Zaghrioui
Mohamed Gargouri
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Show full item recordAbstract
Along with morphological and structural studies, the temperature and frequency dependence of the
electrical and dielectric properties of the CH3NH3HgCl3 (MATM) compound was investigated and
analyzed. SEM/EDS and XRPD analyses proved the purity, composition, and perovskite structure of the
MATM. DSC analysis reveals the existence of an order–disorder phase transition of a first-order type at
about 342 ± 2 K and 320 ± 1 K (heating and cooling, respectively), attributed to the disorder of
[CH3NH3]
+ ions. The overall results of the electrical study provide arguments for the ferroelectric nature
of this compound and aim to broaden the current knowledge on the thermally activated conduction
mechanisms of the studied compound via impedance spectroscopy. The electrical investigations have
shown the dominant transport mechanisms in different frequency and temperature ranges, proposing
the CBH model in the ferroelectric phase and the NSPT model in the paraelectric phase. The
temperature dependence of the dielectric study reveals the classic ferroelectric nature of the MATM. As
for the frequency dependence, it correlates the frequency-dispersive dielectric spectra with the
conduction mechanisms and their relaxation processes