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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.43 [2005] >
IJPAP Vol.43(10) [October 2005] >
| Title: | Dielectric dispersion and microwave dielectric study of marbles in support of radar investigations |
| Authors: | Sengwa, R J
Soni, A |
| Keywords: | Geological materials
Marbles
Dielectric constant
Cole-Cole plots
Relaxation time |
| Issue Date: | Oct-2005 |
| Publisher: | CSIR |
| IPC Code: | G01R27/26 |
| 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. |
| Page(s): | 777-782 |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.43(10) [October 2005]
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