Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/16844
Title: Structural and property changes in poly (vinylidene fluoride- trifluoroethylene) 70/30 mol % copolymer induced by proton irradiation
Authors: Lau, ST
Chan, HLW 
Choy, CL 
Issue Date: 2005
Source: Applied physics A : materials science and processing, 2005, v. 80, no. 2, p. 289-294 How to cite?
Journal: Applied Physics A: Materials Science and Processing 
Abstract: Poly(vinylidene fluoride-trifluoroethylene) 70/30 mol % copolymer has been irradiated with 3 MeV protons at doses ranging from 43 to 200 Mrad. The effects of irradiation on the polarization hysteresis, dielectric properties, lattice spacing, phase transition behavior and electric-field-induced strain have been studied. The irradiated copolymer exhibits the characteristic behavior of a relaxor ferroelectric, including frequency dispersion of the dielectric constant, which follows the Vogel-Fulcher rule. These results indicate that the proton irradiation breaks up the coherent polarization domains in the copolymer into nano-sized regions, thereby converting the copolymer to a relaxor ferroelectric. X-ray diffraction measurements show that the nano-sized regions are in the non-polar phase. Since the lattice spacing of the non-polar phase is substantially different from that of the polar phase, the local phase transformation between these two phases induced by an external electric field gives rise to a large lattice strain and hence a giant electrostrictive response.
URI: http://hdl.handle.net/10397/16844
ISSN: 0947-8396
DOI: 10.1007/s00339-003-2108-6
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