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Transient currents in charging and discharging modes in ethyl cellulose
Author(s) -
Gaur M. S.,
Singh Reeta,
Khare P. K.,
Singh Ranjit
Publication year - 1995
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1995.210370104
Subject(s) - poling , current (fluid) , materials science , ethyl cellulose , transient (computer programming) , space charge , analytical chemistry (journal) , foil method , electric field , field (mathematics) , atomic physics , composite material , chemistry , thermodynamics , optoelectronics , physics , polymer , chromatography , electron , dielectric , mathematics , quantum mechanics , pure mathematics , computer science , ferroelectricity , operating system
Transient current in vacuum aluminized ethyl cellulose foil samples of thickness 75 μm were investigated in charging and discharging modes at different temperatures and fields. The occurrence of a peak in the current–time characteristics of charging current ( I c ), and the dependence of such currents on field, characterized by a negative resistance region and followed by a superlinear region, are considered to indicate injection controlled transient currents modified by space‐charge arising from the localization of carriers in various traps. Carrier mobility values calculated from a knowledge of the peak in the charging current versus time characteristics were found to range from 10 −11 to 10 −9 cm 2 /V s. As times larger than the peak time, the charging current follows the relation I ∝ t − n at low temperatures with different poling fields ( V p ). However, the current increases with time and finally tends to saturate for samples poled at higher temperatures with higher values of field. The isochronal characteristics (i.e. current–temperature plots at fixed times) constructed from discharge current versus time plots are characterized by a peak at 70°C or 100°C, depending upon the poling field values.