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P K Watson F W Schmidlin R V La Donna
W Olthuis P Bergveld
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activation energy air gap amorphous anode Appl applied breakdown bulk calculated cathode charge carriers charge decay charge density charge distribution charge injection coefficient composites copolymer Copyright 1991 IEEE corona charging crystalline curve decay decreases depolarization dielectric constant dielectric relaxation dipole discharge effect electret electret potential electric field electrical conductivity electrode experimental ferroelectric field strength Figure films frequency G. M. Sessler grid heating higher humidity increasing Insul investigated ions irradiation Kapton laser layer LIPP material measurements mechanism metal mobility molecular MV/m negative charge negative corona observed obtained orientation parameters peak permittivity phase Phys piezoelectric plots polarization poling polymer polymeric positively corona pressure pulse pressure wave probe properties PVDF PWP method pyroelectric region relaxation room temperature sample saturation shows signal space charge spectra structure surface charge surface potential technique Teflon Teflon FEP thermally stimulated thermoelectrets thickness transition traps TSDC vacuum voltage zone