Abstract
.This report presents the results of high-pressure and broadband dielectric spectroscopy studies in polyvinylidene difluoride (PVDF) and barium strontium titanate (BST) microparticles composites (BST/PVDF). It shows that the Arrhenius behaviour for the temperature-related dynamics under atmospheric pressure is coupled to Super-Arrhenius/Super-Barus isothermal pressure changes of the primary relaxation time. Following these results, an explanation of the unique behaviour of the BST/PVDF composite is proposed. Subsequently, it is shown that when approaching the GPa domain the negative electric capacitance phenomenon occurs.Graphical abstract
Highlights
This report presents the results of high-pressure and broadband dielectric spectroscopy studies in polyvinylidene difluoride (PVDF) and barium strontium titanate (BST) microparticles composites (BST/PVDF)
This report presents the results of high-pressure broadband dielectric spectroscopy (BDS) studies in a BST/PVDF composite showing that the Arrhenius dynamics for the temperature evolution under atmospheric pressure is coupled to Super-Arrhenius/SuperBarus isothermal pressure changes
Results presented below are for BST/PVDF composites, with a BST amount ranging between 10% to 50% vol fraction of BST
Summary
This report presents the results of high-pressure and broadband dielectric spectroscopy studies in polyvinylidene difluoride (PVDF) and barium strontium titanate (BST) microparticles composites (BST/PVDF). This report presents the results of high-pressure BDS studies in a BST/PVDF composite showing that the Arrhenius dynamics for the temperature evolution under atmospheric pressure is coupled to Super-Arrhenius/SuperBarus isothermal pressure changes. To test the possible influence of pressure and BST amount on the peak frequency of the loss curves and the primary relaxation time the distortion-sensitive analysis presented in the inset in fig.
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