Studies of electric, dielectric properties, and conduction mechanism of {(C2H10N2)(MnCl (NCS)2)2}n polymer

Dielectric and electrical properties correlated with the structure analysis have
been studied for new crystalline polymer {(C2H10N2)(MnCl (NCS)2)2}n. The frequency and temperature dependence of dielectric constant (ε0), dielectric loss
(ε00) and loss tangent (tanδ) in the temperature range 308-348 K and frequency
range 20 to 2 MHz have been made for {(C2H10N2)(MnCl (NCS)2)2}n. The Z0
and Z00 versus frequency plots are well fitted to an equivalent circuit model.
The analysis of Nyquist plots is well fitted to an equivalent circuit consisting of
series of combination of grains and grain boundary elements. The spectra follow the Arrhenius law with two activation energy the first in the region of temperatures before 332 K (Region I) and the second in the region after 332 K
(Region II). An agreement between the experimental and theoretical results is
discussed, and it is suggested that the ac conductivity can be explained by the
correlated barrier hopping (CBH) and nonoverlapping small polaron tunneling
model (NSPT) in regions I and II, respectively. The AC conduction mechanism
is governed by the correlated barrier-hopping (CBH) with WM (Region
I) = 270 meV and a tunneling distance of 4.5 Å, whereas it becomes a small
polaron tunneling mechanism (SPTM) mechanism with a WH (Region
II) = 153 meV. The imaginary part of the electrical modulus formalism obeys
the Kohlrausch-Williams-Watt (KWW) model. The theoretical Kohlrausch
exponent (βKWW) confirms the existence of the transition phase on the new
crystalline polymer in the vicinity of the 332 K as deduced by the DC and the
AC conduction parameters. Thus, the near values of activation energies
obtained from the impedance and modulus spectra confirm that the transport
is through an ion hopping mechanism.