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- W2102466811 abstract "Polar species in ferroelectric and nonlinear optical polymers must be oriented in one direction by application of an external electric field in order to insure good working characteristics of the materials. The corresponding process called poling or charging is an important step in obtaining desired properties. The most advanced is the corona charging method applied earlier in electrophotography [1], in electrets [2] and in electrostatic filters [3]. Due to its versatility, the corona method allows to optimize poling by proper selection of the poling mode, polarity and temperature. A corona is a self-sustainable discharge occurring if a sufficiently high voltage is applied to asymmetric electrodes such as a point and a plate [4]. In the ionization area near the point, depending on corona polarity, either positive or negative ions are produced. The ions bombard the bare sample surface and no electrode is required on this side. The process takes place at atmospheric pressure, so the ions have an average thermal energy. The ions do not penetrate into the bulk, but transfer their charge and leave the surface as neutral atoms or molecules. The excess charge either resides on the surface, or is injected in the bulk. The advantages of the corona charging are: (a) poling can be performed without deposited electrodes (b) higher fields than in case of sandwich poling can be achieved, and (c) thin films can be poled in spite of defects, because breakdown is limited only to small sample area. A simple point-to-plane geometry has been gradually replaced by a corona triode with a metal grid introduced between the point and the sample. Apart from charging, the corona triode was used to study dynamics of poling and charge transport phenomenon in polymers [5-10]. This paper gives a short review of the corona charging of ferroelectrics and nonlinear optical polar polymers with an accent on using constant current corona poling (CCCP)." @default.
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- W2102466811 date "2002-01-01" @default.
- W2102466811 modified "2023-09-27" @default.
- W2102466811 title "CORONA POLING OF FERROELECTRIC AND NONLINEAR OPTICAL POLYMERS" @default.
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