ISSN:
0959-8103
Keywords:
ethyl cellulose
;
transient current
;
Curie-von Schweidler law
;
negative resistance region
;
dipolar relaxation
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
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 (Ic), 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 cm2/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 (Vp). 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.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pi.1995.210370104
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