Figure - available from: Physica Scripta
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Charge density σ of FEP and PP film with dirrerent polarizing conditions. (Variation of σ with the polarizing voltage at 140 °C (a) with mode 1 and (b) with mode 2. (c)Variation of σ with temperature under a polarizing voltage of –600 V with mode 1. (d) Variation of σ with temperature under a polarizing voltage of –200 V with mode 2).
Source publication
The heterogeneous interface of two different dielectrics is commonly observed in diverse electronic devices. Charge emerging will take place at the heterogeneous interface and may greatly influence the device performance. Typically, charge emerging behavior is attributed to the Maxwell-Wagner effect. The emerged charge by the Maxwell-Wagner effect...
Citations
Thermally stimulated discharge (TSD) technique is a traditional method in dielectric research, especially for electrets. However, in conventional open-circuit and short-circuit TSD techniques, it is difficult to distinguish the surface charge and body charge of dielectric materials. In particular with the test of polymer electrets, the deformation of the polymer film may take place during the measurement process, which will affect the accuracy of the experiment results. In this paper, a glass-assisting TSD (GA-TSD) technique is proposed to solve the above problems. The feasibility of the experimental technique is verified with the GA-TSD spectra of fluorinated ethylene-propylene copolymer electret films. In addition, their theory analysis is also accomplished. The influences of glass thickness, glass dielectric property, and metallizing on the glass on GA-TSD spectra are investigated. The results prove that the GA-TSD spectra can clearly distinguish the difference between surface charge and body charge according to the current direction. The quartz glass with the lowest dielectric constant is best suitable for the GA-TSD technique. The influence of the glass thickness and metallizing on the glass on GA-TSD spectra is little.
