Article ID Journal Published Year Pages File Type
10624160 Ceramics International 2016 5 Pages PDF
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 0.4 vol% MWCNT showed the highest dielectric constant (912 at 1 kHz), which is approximately 25 times larger than that (37 at 1 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
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