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Title: Relaxor ferroelectric of gamma-irradiated poly(vinylidene fluoride-trifluoroethylene) copolymers
Title of periodic: Physical Review B New York
metadata.dc.title.subtitlejournal: Condensed Matter and Materials Physics
Authors: Welter, C.
Faria, Luiz Oliveira de
Moreira, R.L.
Affiliation: Universidade Federal de Minas Gerais/UFMG, Belo Horizonte, MG, Brasil
Centro de Desenvolvimento da Tecnologia Nuclear/CDTN, Belo Horizonte, MG, Brasil
Universidade Federal de Minas Gerais/UFMG, Belo Horizonte, Mg, Brasil
Issue Date: 2003
Keywords: Copolymers;gamma radiation;ferroelectric materials
Abstract: We have conducted a systematic investigation on g-irradiated poly~vinylidene fluoride-trifluoroethylene! equimolar samples. The appearance of relaxor features is clearly demonstrated for this copolymer, for gammairradiation doses comparable to those of electron irradiated samples. This material constitutes a new class of relaxor ferroelectrics, since its structure has no direct relationship with perovskite or tungsten-bronze structures and it is also the first non-displacive relaxor ferroelectric. Dielectric, calorimetric, structural, and spectroscopic data allowed us to draw a picture of the chemical and morphological modifications that cause the appearance of the relaxor behavior of the material. In particular, the loss of stability of the ferroelectric domains is attributed to the freezing of the amorphous phase, which forbids the establishment of long-range ferroelectric order.
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