Picture of two heads

Open Access research that challenges the mind...

The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including those from the School of Psychological Sciences & Health - but also papers by researchers based within the Faculties of Science, Engineering, Humanities & Social Sciences, and from the Strathclyde Business School.

Discover more...

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

Full text not available in this repository. (Request a copy from the Strathclyde author)

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.