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Temperature dependent low frequency dielectric and conductivity measurements of Argonne Premium coals

Mackinnon, A.J. and Hayward, D. and Hall, P.J. and Pethrick, R.A. (1994) Temperature dependent low frequency dielectric and conductivity measurements of Argonne Premium coals. Fuel, 73 (5). pp. 731-737. ISSN 0016-2361

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Abstract

A study has been made of the dielectric properties of a series of Argonne Premium coals as a function of frequency and temperature. Measurements were made in the low frequency range, 0.01-105 Hz, over the temperature range 300-450 K. Two distinct processes were observed over the frequency range. At low frequency, real and imaginary components of the permittivity showed an increase with decreasing frequency, particularly at low frequency and high temperature. This type of behaviour is consistent with a Maxwell-Wagner-Sillars process. At higher frequency, a dipolar relaxation was observed for four of the coals and this was shown to be an activated process. The real conductivity of each coal measured at 0.01 Hz was shown to increase with temperature with the majority of coals showing a distinct break at 370-380 K.

Item type: Article
ID code: 17684
Keywords: coal, dielectric properties, conductivity, Chemical engineering, Energy Engineering and Power Technology, Organic Chemistry, Chemical Engineering(all), Fuel Technology
Subjects: Technology > Chemical engineering
Department: Faculty of Engineering > Chemical and Process Engineering
Faculty of Science > Pure and Applied Chemistry
Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 09 May 2010 16:43
    Last modified: 05 Sep 2014 00:45
    URI: http://strathprints.strath.ac.uk/id/eprint/17684

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