Dielectric Relaxation Behavior of Three-Dimensional Copper Calcium Titanate/Epoxy-Boron Nitride Composite Dielectrics
ZHANG Dongmei
XUE Wenqing
YANG Yongzhi
GUO Wenbin
YANG Shuo
LI Yufan
LI Yuchao
Abstract：Three-dimensional calcium copper titanate(3D CCTO)ceramic network was constructed by sol-gel method using cleanroom wiper as template,and then epoxy-boron nitride nanosheets(EP-BNNS)with different proportions of BNNS were reversely introduced into the 3D CCTO ceramic network to prepare 3D CCTO/EP-BNNS composite dielectric materials.The effects of 3D CCTO and BNNS on the dielectric re-laxation of composite dielectric materials at different temperatures were studied by means of dielectric modulus.The results showed that when EP reached saturation,the mass and volume fraction of 3D CCTO ceramic network were 34%,and 9.2%,respectively,and the good 3D network structure of ceramics was remained simultaneously.The dielectric constant of 3D CCTO/EP-1.0BNNS composite dielectric material was as high as 25.8 at 1 kHz and the dielectric loss was as low as 0.032,being 170%and 89%of the tradi-tional CCTO powder filled CCTO/EP system,respectively.3D CCTO and BNNS achieved a good syner-gistic reinforcement effect.The isothermal dielectric relaxation spectra showed that the addition of 3D CC-TO can significantly improve the polarization of the dielectrics,while the addition of BNNS can distinctly restrain the carrier transition and reduce the dielectric loss.
Keywords：calcium copper titanateboron nitridedielectricsrelaxationdielectric modulus
Publication Date：2024-08-28
Online Publishing Date：2026-08-28(First online date of this platform, not the publication date of the document)
Pages：8( 103-110 )