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|Title:||Dielectric dispersion and microwave dielectric study of marbles in support of radar investigations|
|Authors:||Sengwa, R J|
|Keywords:||Geological materials;Marbles;Dielectric constant;Cole-Cole plots;Relaxation time|
|Abstract:||The dielectric permittivity ' and loss '' of nine marble samples collected from open marble mines of Makarana, Rajsamand, Ambhaji and Kesariyaji of Rajasthan were studied in the frequency range 100 Hz-100 kHz and also at 10.1 GHz at room temperature. It is found that the ' values of dry marbles decrease with increase in frequency in the range 100 Hz-100 kHz. All the studied marbles are governed by the Cole-Cole dielectric dispersion. The values of static dielectric constant o, high frequency limiting dielectric constant ∞, dielectric relaxation strength , distribution parameter , and relaxation time for dipole rotation τ were determined from the complex Cole-Cole plots. All these samples have values greater than 0.5 and their Δ values vary significantly. Further, wide variation in ac conductivity σ is also observed for different samples. The effect of sample bulk density and variation in the chemical composition on low frequency and microwave permittivity of the studied marbles have been recognized. The measured values of dielectric permittivity of these marbles were also compared and discussed with the earlier reported ' values of marbles and limestones of other regions. The precise microwave dielectric measurements of marbles and recognization of their dependence on petrological and chemical composition are interesting and can be used in support of radar investigations of the Earth’s geology.|
|ISSN:||0975-1041 (Online); 0019-5596 (Print)|
|Appears in Collections:||IJPAP Vol.43(10) [October 2005]|
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