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The final thermally stimulated discharge current (FTSDC) technique can be used to analyze charge trapping and transport in insulating materials. The experimental conditions can be selected so that the FTSDC is mainly determined by the space charge detrapping. Measurements of the FTSDC in a wide temperature range including the local (secondary) (/spl beta/(More)
We have demonstrated that besides a polarization current there is a current related to charge injection or extraction at the metal-dielectric contact and a reverse current related to the charge trapped into the superficial traps of the dielectric and which can jump at the interface in a reverse way. An analytical expression is proposed for the OCICC and(More)
Using a recently developed procedure combining isothermal and nonisothermal current measurements space charge trapping and transport in LDPE was successfully studied. Unaged, thermally and electrically aged samples were investigated. The samples were conditioned before each measurement in order to obtain reproducible results. In the nonisothermal(More)
The authors have presented a new electrical method to investigate the molecular dynamics in polar and non-polar materials at nanoscopic level. During a charging process electric charge is injected in material, in other words the structure is decorated with space charge. During the subsequent heating of the sample we are observing an apparent peak and the(More)
It is shown that, in the analysis of fractional polarization thermally stimulated depolarisation current, the values obtained for the activation energy W and the preexponential factor /spl tau//sub 0/ depend on which one is assumed constant. The elemental peak position and shape change significantly for simulations where we assume that the activation energy(More)
The transient conductivity in low-density polyethylene is studied. Isochronal current-voltage measurements for 4 h and 4 days time intervals are carried out under a dry N/sub 2/ atmosphere. The activation energy is around 0.70 eV. It changes if the measurements are not carried out close to the steady state condition. At a constant heating rate of 0.12 K/min(More)
The experimental results obtained in a wide range of temperatures, for polyethylene terephthalate, demonstrate that the apparent activation energy changes when the charging (polarization) time or the isothermal discharging time, prior to the final thermally stimulated discharge current measurement, are used as variable parameters. Consequently, the charging(More)
Thermal properties—such as thermal conductivity, thermal diffusivity, and specific heat—of metal (copper, zinc, iron, and bronze) powder-filled high-density polyethylene composites are investigated experimentally in the range of filler content 0–24% by volume. Experimental results show a region of low particle content, 0–16% by volume, where the particles(More)
The problem of charge injection/extraction at a metal- dielectric contact is treated theoretically by analogy with that for a metal-semiconductor contact. However, because in a dielectric material there is a large number of surface traps and bulk traps, the electrical conduction through a dielectric material is bulk limited and electrode limited and it is(More)
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