Dielectric Properties and Electrical Percolation in MnFe2O4/Epoxy Resin Composites

被引：7

作者：

Meisak, Darya ^{[1
,2
]}

Macutkevic, Jan ^{[1
]}

Selskis, Algirdas ^{[3
]}

Banys, Juras ^{[1
]}

Kuzhir, Polina ^{[2
,4
]}

机构：

[1] Vilnius Univ, Phys Fac, LT-00122 Vilnius, Lithuania

[2] Belarusian State Univ, Res Inst Nucl Problems, Minsk 220030, BELARUS

[3] Ctr Phys Sci & Technol, Dept Characterisat Mat Struct, LT-10257 Vilnius, Lithuania

[4] Univ Eastern Finland, Inst Photon, Yliopistokatu 7, FI-80101 Joensuu, Finland

来源：

PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE | 2020年 / 217卷 / 06期

基金：

芬兰科学院; 欧盟地平线“2020”;

关键词：

dielectric properties; electrical percolation; MnFe2O4; FERRITE NANOPARTICLES; MAGNETIC-PROPERTIES; MANGANESE;

D O I：

10.1002/pssa.201900526

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Broadband dielectric properties of epoxy composites containing the different additions of manganese ferrite (MnFe2O4) with two spherical particle sizes (28 and 60 nm) are studied in the wide temperature range from 150 to 500 K. The percolation thresholds in such systems are 30 and 29.3 vol% for small and large MnFe2O4 particles, respectively. The small difference in the percolation threshold value is related to a better distribution of larger nanoparticles. Composites above the percolation threshold are appropriate candidates for electromagnetic shielding applications. Above 380 K, the electrical conductivity is typical for all composites, both below and above the percolation thresholds due to the electrical transport in the polymer matrix. The activation energy strongly decreases with MnFe2O4 concentration indicating that the electrical transport occurs simultaneously in both MnFe2O4 and epoxy matrix subsystems.

引用

页数：6

共 21 条

[1] Magnetic properties of CoFe2O4 nanoparticles synthesized through a block copolymer nanoreactor route [J].