Eur. Phys. J. E (2019) 42: 118
https://doi.org/10.1140/epje/i2019-11876-9

Regular Article

Polymer matrix ferroelectric composites under pressure: Negative electric capacitance and glassy dynamics

¹ Institute of High Pressure Physics of the Polish Academy of Sciences, ul. Sokołowska 29/37, 01-142, Warsaw, Poland
² State Key Laboratory of Solidification Processing, MIIT Key Laboratory of Radiation Detection Materials and Devices, NPU-QMUL Joint Research Institute of Advanced Materials and Structure, School of Material Science and Engineering, Northwestern Polytechnical University, 710072, Xi’an, China
³ Faculty of Chemistry, Warsaw University of Technology, ul. Noakowskiego, 00-664, Warsaw, Poland

^* e-mail: starzoneks@unipress.waw.pl

Received: 5 January 2019
Accepted: 28 July 2019
Published online: 9 September 2019

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.