压力下的聚合物基铁电复合材料：负电容与玻璃态动力学
Polymer matrix ferroelectric composites under pressure: Negative electric capacitance and glassy dynamics.
作者信息
Starzonek Szymon, Drozd-Rzoska Aleksandra, Rzoska Sylwester J, Zhang Kena, Pawlikowska Emilia, Kȩdzierska-Sar Aleksandra, Szafran Mikolaj, Gao Feng
机构信息
Institute of High Pressure Physics of the Polish Academy of Sciences, ul. Sokołowska 29/37, 01-142, Warsaw, Poland.
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.
出版信息
Eur Phys J E Soft Matter. 2019 Sep 9;42(9):118. doi: 10.1140/epje/i2019-11876-9.
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.
本报告展示了在聚偏氟乙烯（PVDF）和钛酸锶钡（BST）微粒复合材料（BST/PVDF）中进行的高压和宽带介电谱研究结果。结果表明，常压下与温度相关的动力学的阿仑尼乌斯行为与初级弛豫时间的超阿仑尼乌斯/超巴鲁斯等温压力变化相关联。基于这些结果，对BST/PVDF复合材料的独特行为提出了一种解释。随后表明，当接近吉帕（GPa）范围时，会出现负电容现象。
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