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- W2076101624 abstract "A thermal hysteresis loop in the elastic incoherent scattering function $F(T,Q)$ of vinylidene fluoride and trifluoroethylene copolymer of molar fraction $p=0.70$ and crystallinity $c=0.61$ was observed by neutron scattering around the ferroelectric phase transition. We have performed three different measurements of $F(T,Q)$: incoherent elastic neutron scattering measurements using a backscattering spectrometer and incoherent quasielastic neutron scattering measurements with both a backscattering spectrometer and a time of flight spectrometer. The elastic measurements were analyzed using the concept of dynamical entropy defined by ${S}_{d}(T,Q)=ensuremath{-}Rphantom{rule{0.2em}{0ex}}mathrm{ln}[F(T,Q)]$. From the $Q$ dependence of the dynamical entropy, two characteristic lengths were obtained: the thermal diffusion length ${ensuremath{lambda}}_{1}(T)$ related to the diffusion constant or, alternatively, to an effective vibrational motion and the localization length ${ensuremath{lambda}}_{2}(T)$ associated with the confined volume. The thermal hysteresis loop of the dynamical entropy is attributed to a change in the available volume associated with the structural phase transition, which is different in the heating and cooling scans." @default.
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- W2076101624 title "Characteristic lengths measured by incoherent elastic and quasielastic neutron scattering within the thermal hysteresis loop in a ferroelectric copolymer" @default.
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