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Title: Investigating low-frequency dielectric properties of a composite using the distribution of relaxation times technique

Abstract

The distribution of relaxation times approach, a less frequently employed dielectric data analysis technique, is utilized to better understand the relaxation characteristics of composites consisting of metal-coated, hollow glass spheres dispersed in a paraffin wax matrix. The dielectric properties of the composite samples are measured by means of impedance spectroscopy in the frequency range 0.1 mHz to 10 MHz. The application of a mixture law is not appropriate for the analysis of the frequency-dependent properties of the considered system on this broad frequency range. However, utilization of the distribution of relaxation times procedure to study the dielectric behaviour shows clear trends in the mixtures' relaxation spectra. Relaxation processes of the paraffin wax and those specific to the composites are found from the extracted distribution of relaxation times spectra. The influence of the filler concentration, q, on the dielectric properties is examined; a relaxation with a narrow distribution at intermediate frequencies becomes broad with the addition of the filler. This relaxation, in the form of the low-frequency-dispersions (also known as constant phase angle) phenomenon, dominates the dielectric properties of the composites with high bead concentration, q>0.15. The variation in dielectric properties of individual samples whose bead concentrations q are nominally themore » same is discussed in terms of possible microstructural variations.« less

Authors:
 [1];  [2];  [3];  [4]
  1. ORNL
  2. Center for Nondestructive Evaluation, Ames, Iowa
  3. DSTL, Porton Down, Salisbury, Wiltshire, UK
  4. QinetiQ Ltd, Hampshire, UK
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
OE USDOE - Office of Electric Transmission and Distribution
OSTI Identifier:
1003676
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Philosophical Magazine; Journal Volume: 86; Journal Issue: 16
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DATA ANALYSIS; DIELECTRIC MATERIALS; DIELECTRIC PROPERTIES; DISTRIBUTION; FILLERS; FREQUENCY RANGE; GLASS; IMPEDANCE; MIXTURES; PARAFFIN; RELAXATION; RELAXATION TIME; SPECTRA; SPECTROSCOPY

Citation Formats

Tuncer, Enis, Bowler, Nicola, Youngs, I. J., and Lymer, K. P.. Investigating low-frequency dielectric properties of a composite using the distribution of relaxation times technique. United States: N. p., 2006. Web. doi:10.1080/14786430500527361.
Tuncer, Enis, Bowler, Nicola, Youngs, I. J., & Lymer, K. P.. Investigating low-frequency dielectric properties of a composite using the distribution of relaxation times technique. United States. doi:10.1080/14786430500527361.
Tuncer, Enis, Bowler, Nicola, Youngs, I. J., and Lymer, K. P.. Sun . "Investigating low-frequency dielectric properties of a composite using the distribution of relaxation times technique". United States. doi:10.1080/14786430500527361.
@article{osti_1003676,
title = {Investigating low-frequency dielectric properties of a composite using the distribution of relaxation times technique},
author = {Tuncer, Enis and Bowler, Nicola and Youngs, I. J. and Lymer, K. P.},
abstractNote = {The distribution of relaxation times approach, a less frequently employed dielectric data analysis technique, is utilized to better understand the relaxation characteristics of composites consisting of metal-coated, hollow glass spheres dispersed in a paraffin wax matrix. The dielectric properties of the composite samples are measured by means of impedance spectroscopy in the frequency range 0.1 mHz to 10 MHz. The application of a mixture law is not appropriate for the analysis of the frequency-dependent properties of the considered system on this broad frequency range. However, utilization of the distribution of relaxation times procedure to study the dielectric behaviour shows clear trends in the mixtures' relaxation spectra. Relaxation processes of the paraffin wax and those specific to the composites are found from the extracted distribution of relaxation times spectra. The influence of the filler concentration, q, on the dielectric properties is examined; a relaxation with a narrow distribution at intermediate frequencies becomes broad with the addition of the filler. This relaxation, in the form of the low-frequency-dispersions (also known as constant phase angle) phenomenon, dominates the dielectric properties of the composites with high bead concentration, q>0.15. The variation in dielectric properties of individual samples whose bead concentrations q are nominally the same is discussed in terms of possible microstructural variations.},
doi = {10.1080/14786430500527361},
journal = {Philosophical Magazine},
number = 16,
volume = 86,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}