Electron-Irradiation Induced Phase Transition in Poly(Vinylidene Fluoride-Trifluoroethylene)Copolymer
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概要
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The electron-irradiation induced ferroelectric-to-relaxor phase traflsition in poly(vinylidene fluoride-trinuoroethylene)(P(VDF/TrFE))copolymer was investigated. One polymer with a composition of 53 mol% VF_2(PVDF53)and a Curie temperature of 67℃, and another with 76 mol% VF_2(PVDF76)and a Curie temperature of 136℃, were used in the research. Changes in hysteresis loop, permittivity and electrostriction during the phase transition were measured. X-ray diffraction showed that PVDF53 had a second-order phase transition during the irradiation in which the structure was changing continuously, while PVDF76 had a first-order phase transition in which the structure changed discontinuously. Field-induced piezoelectric response was measured using a loudspeaker which provided a vibrational force, and d_<31> = 135 pC/N at bias E_3 = 40MV/m was obtained. The conditions for electron irradiation and composition of the copolymers were discussed.
- 社団法人応用物理学会の論文
- 2000-09-30
著者
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Chou I-chin
Materials Research Laboratory Pennsylvania State University
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Cross Leslie
Materials Research Laboratory The Pennsylvania State University
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Karaki Tomoaki
Department Of Eiectronics And Lnformatics Faculty Of Engineering Toyama Prefectutral Universtiy
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Cross Leslie
Materials Research Laboratory Pennsylvania State University
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Cross Leslie
Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, U.S.A.
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