Relative dielectric constant from dry rocks

Wang, Xiangyun; Guo, Huadong; Wang, Chao; Chen, Peirong; Shi, Yue

doi:10.1007/bf02885941

Cited by 12 publications

(6 citation statements)

References 13 publications

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“…microwave frequency. These results are comparable with the results reported by Fawwaz et al [29] and Xiangyun et al [30] who measured the ε values at 0-18 GHz microwave frequency.…”

Section: Dielectric Properties Of Chalcedony and Agatesupporting

confidence: 92%

Dielectric behaviors at microwave frequencies and Mössbauer effects of chalcedony, agate, and zultanite

Paralı¹,

Şabikoğlu²,

Pěchoušek³

et al. 2015

Chinese Phys. B

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In this study, dielectric properties within 8–12 GHz microwave frequencies, inductively coupled plasma-atomic emission spectrometry, Fourier transform infrared spectrometry, synchronized two thermal analyses, and 57Fe Mössbauer spectroscopy analysis of chalcedony, agate, and zultanite samples from Turkey are presented. Agate and chalcedony show the same nine vibrational absorption peaks obtained unlike zultanite from FTIR spectra in the 350 cm−1 to 4000 cm−1 range, ε′ values of chalcedony, agate and zultanite derived at 10.5 GHz were 4.67, 4.41, and 7.34, respectively, ε′ and ε″ values of the studied samples at the microwave frequencies are related to the percentage weight of their constituent parts in their chemical compositions. 57Fe Mössbauer spectroscopy results confirm the existence of iron-containing islands in the crystal structure of zultanite, agate, and chalcedony samples, equipped them with magnetic features typical for magnetic nanoparticles including superparamagnetism. The presence of iron-containing islands significantly affects the magnetic, dielectric, and optical properties of studied samples that are not observed for pure minerals without any foreign inclusions.

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“…microwave frequency. These results are comparable with the results reported by Fawwaz et al [29] and Xiangyun et al [30] who measured the ε values at 0-18 GHz microwave frequency.…”

Section: Dielectric Properties Of Chalcedony and Agatesupporting

confidence: 92%

Dielectric behaviors at microwave frequencies and Mössbauer effects of chalcedony, agate, and zultanite

Paralı¹,

Şabikoğlu²,

Pěchoušek³

et al. 2015

Chinese Phys. B

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“…Many scholars had measured the complex permittivity of dry rocks and minerals with different methods. The measurement results for diverse rocks and minerals are compiled in the literature (Ahmad & Zihlif 1990; Griffin 1974; Howell & Cicastro 1961; Nguyen et al 1998; Rust et al 1999; Ulaby et al 1990; Wang et al 1999; Zheng et al 2005). But some limitations are involved in reliable measurements of the dielectric properties of rocks and minerals.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the complex permittivity of dry rocks and minerals: application of polythene dilution method and Lichtenecker's mixture formulae

Zheng

Wang²,

Feng³

et al. 2005

Geophysical Journal International

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S U M M A R YThe complex permittivity of dry rocks and minerals varies over a very wide range, even within a sample there are variation at different temperatures and frequencies. Most rocks and minerals are inhomogeneous materials, therefore, most of the present methods of dielectric measurement designed for artificial homogeneous materials are not suitable for rocks and minerals. The resonant cavity perturbation (RCP) method is a reliable and simple technique to determine the complex permittivity of dielectric materials in the GHz range, and this method is also used extensively. However, the traditional RCP method is sensitive to the measurement of low dielectric constant (ε ) and low loss factor (ε or tan δ) materials. The complex permittivity of most dry rocks and minerals exceeds the span vibration of the RCP method, and cannot be measured by the RCP method directly.This paper proposes a new method to measure the complex permittivity of dry rocks and minerals with the RCP method incorporated in the application of polythene (PE) dilution method and Lichtenecker's mixture formulae. Dry rocks and minerals were ground into fine powder. The powder of rocks and minerals was mixed with polythene powder in a definite volume per cent. The mixture was heated and pressed into a thin circular slice. The slice was processed into a small rectangular strip sample, the size of which was fitted to the demands of the RCP method. The complex permittivity of the strip was obtained by the RCP method. The relationship between the dielectric properties of the two-phase mixture and those of each phase in the mixture can be expressed by Lichtenecker's mixture formula. Thus the complex permittivity of dry rocks and minerals can be calculated from the complex permittivity of the mixture in case the complex permittivity of polythene is known. The presented method was verified by measurements of reference materials of various known complex permittivity and other reliable dielectric measurement methods. The results of the experiment showed that this new method is of high accuracy, small sample requirement, and convenient application. Moreover, the complex permittivity of rocks and minerals measured by this method is more reliable than the direct dielectric measurement of rocks or minerals without application of the polythene dilution method and Lichtenecker's mixture formulae.

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“…For the fine particle PM2.5 [11], if the particle is generated from an inorganic mineral, the relative permittivity ε r of the particles employed in this section is then assumed to be 5, based on [13]. When E 0 equals the limit value of DC ionized field on the ground level, namely 30 kV/m [14], the electric field magnitude that is generated by the particle with saturation charge amount can be calculated using Gauss's law, as shown in Fig.…”

Section: Charging Of the Dielectric Particle A Hypothesesmentioning

confidence: 99%

“…The relative permittivity ε r of the particles employed in the calculation in Fig. 4 is assumed to be 5, and it is in accordance with [13]. The impact of particle relative permittivity on both charging and motion processes are discussed in the posterior text.…”

Section: Charging Of the Dielectric Particle A Hypothesesmentioning

confidence: 99%

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Analysis of dielectric particles charging and motion in the direct current ionized field

Zou

Cui

2016

CSEE Power and Energy Syst.

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Relative dielectric constant from dry rocks

Cited by 12 publications

References 13 publications

Dielectric behaviors at microwave frequencies and Mössbauer effects of chalcedony, agate, and zultanite

Dielectric behaviors at microwave frequencies and Mössbauer effects of chalcedony, agate, and zultanite

Measurement of the complex permittivity of dry rocks and minerals: application of polythene dilution method and Lichtenecker's mixture formulae

Analysis of dielectric particles charging and motion in the direct current ionized field

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