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Ion transport study in polymer-nanocomposite films by dielectric spectroscopy and conductivity scaling

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Title Ion transport study in polymer-nanocomposite films by dielectric spectroscopy and conductivity scaling
 
Creator TRIPATHI, N
THAKUR, AK
SHUKLA, A
MARX, DT
 
Subject FREQUENCY-DEPENDENT CONDUCTIVITY
AC CONDUCTIVITY
DISORDERED SOLIDS
RELAXATION
GLASSES
ELECTROLYTES
UNIVERSALITY
BEHAVIOR
SPECTRA
Polymer nanocomposite
Microstructure
Electoral properties
Ion hopping
 
Description The dielectric and conductivity response of polymer nanocomposite electrolytes (films of PMMA(4)LiClO(4) dispersed with nano-CeO2 powder) have been investigated. The dielectric behavior was analyzed via the dielectric permittivity (epsilon ') and dissipation factor (tan delta) of the samples. The analysis has shown the presence of space charge polarization at lower frequencies. The real part of ac conductivity spectra of materials obeys the Jonscher power law. Parameters such as dc conductivity, hopping rate, activation energies and the concentration of charge carriers were determined from conductivity data using the Almond West formalism. It is observed that the higher ionic conductivity at higher temperature is due to increased thermally-activated hopping rates accompanied by a significant increase in carrier concentration. The contribution of carrier concentration to the total conductivity is also confirmed from activation energy of migration conduction and from Summerfield scaling. The ac conductivity results are also well correlated with TEM results. Published by Elsevier B.V.
 
Publisher ELSEVIER SCIENCE BV
 
Date 2016-01-15T04:54:34Z
2016-01-15T04:54:34Z
2015
 
Type Article
 
Identifier PHYSICA B-CONDENSED MATTER, 468,50-56
0921-4526
1873-2135
http://dx.doi.org/10.1016/j.physb.2015.04.013
http://dspace.library.iitb.ac.in/jspui/handle/100/17809
 
Language en