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A bipolar charge transport model has been developed to simulate the dynamics of space charge under dc fields. The modeling shows space charge build-up and decay comparable to experiments. In this paper, this bipolar charge transport model is taken further to simulate the space charge in polyethylene under ac fields. The results show that there is small quantity of phase-dependent bipolar charge accumulation...
Transient space charge within polyethylene has been simulated based on a bipolar charge transport model with a constant mobility. Initial results are in good agreement with those previously reported. To further develop the model, two types of field-dependent carrier mobility: power-law mobility and Poole-Frenkel mobility are considered in the charge transport process. Various space charge profiles...
This paper reports on the investigation into space charge characteristics at interfaces of multi-layer polymeric materials. Planar low density polyethylene (LDPE) samples were used in this study. DC voltage up-to 10 kV was applied to the sample and space charge measurements were taken using the pulsed electro-acoustic (PEA) technique. Experimental results indicated that the electrode interface plays...
The lead zirconate stannum titanate antiferroelectric ceramics(abbr. as PZST) were fabricated by using convenient solid sintering methods. It was of double electric hysteresis and the switching electric fields between of antiferroelectric and ferroelectric phases could be modulated with material composition change. The discharge curves were measured. The results showed that antiferroelectric ceramics...
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