Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10624160 | Ceramics International | 2016 | 5 Pages |
Abstract
Dielectric composites fabricated by combining multi-walled carbon nanotubes (MWCNT) and PbTiO3 (PTO) powder were prepared using a sol-gel process. Well-dispersed PTO powder with various volume ratios of MWCNT was compressed to form a pellet, and then silver electrodes were coated on both sides for electrical measurements. The PTO-MWCNT composite with 0.4Â vol% MWCNT showed the highest dielectric constant (912 at 1Â kHz), which is approximately 25 times larger than that (37 at 1Â kHz) of a pure PbTiO3 pellet. Furthermore, a strong frequency dependence of the dielectric constant in the low frequency range was shown for the PTO-MWCNT composites. Interfacial effects related to dielectric relaxation in composite materials were used to explain an observed increase of the dielectric constant near the percolation threshold.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Jin Ho Kwak, Jin Kyu Han, Sin Wook Kang, Trent Allen Johnson, Sang Don Bu,