Electrical conductivity and dielectric permittivity of sphere packings: Measurements and modelling of cubic lattices, randomly packed monosize spheres and multi-size mixtures

2005 ◽  
Vol 358 (2-4) ◽  
pp. 447-465 ◽  
Author(s):  
David A. Robinson ◽  
Shmulik P. Friedman
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Permittivity ◽  
Sphere Packings ◽  
Cubic Lattices

Complex dielectric permittivity, electric modulus and electrical conductivity analysis of Au/Si3N4/p-GaAs (MOS) capacitor

2021 ◽  
Author(s):  
Sema Türkay ◽  
Adem Tataroğlu
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Permittivity ◽  
Electric Modulus ◽  
Arrhenius Equation ◽  
Rf Magnetron Sputtering ◽  
Oxide Semiconductor ◽  
Complex Dielectric Permittivity ◽  
Mos Capacitor ◽  
Universal Power Law ◽  
Complex Electrical Conductivity

AbstractRF magnetron sputtering was used to grow silicon nitride (Si3N4) thin film on GaAs substrate to form metal–oxide–semiconductor (MOS) capacitor. Complex dielectric permittivity (ε*), complex electric modulus (M*) and complex electrical conductivity (σ*) of the prepared Au/Si3N4/p-GaAs (MOS) capacitor were studied in detail. These parameters were calculated using admittance measurements performed in the range of 150 K-350 K and 50 kHz-1 MHz. It is found that the dielectric constant (ε′) and dielectric loss (ε″) value decrease with increasing frequency. However, as the temperature increases, the ε′ and ε″ increased. Ac conductivity (σac) was increased with increasing both temperature and frequency. The activation energy (Ea) was determined by Arrhenius equation. Besides, the frequency dependence of σac was analyzed by Jonscher’s universal power law (σac = Aωs). Thus, the value of the frequency exponent (s) were determined.

Effects of layered sediments on the guided wave in crosswell radar data

Geophysics ◽  
1999 ◽  
Vol 64 (6) ◽  
pp. 1698-1707 ◽  
Author(s):  
Karl J. Ellefsen
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Permittivity ◽  
Radar Data ◽  
Guided Wave ◽  
Sand Layer ◽  
Clay Layers ◽  
The Waves

To understand how layered sediments affect the guided wave in crosswell radar data, traces are calculated for a model representing a sand layer between two clay layers. A guided wave propagates if the wavelengths in the sand layer are similar to the thickness of the sand layer. The amplitude of the guided wave but not its initial traveltime is affected by the thickness of the sand layer. In contrast, both the amplitude and the initial traveltime are affected by the locations of the transmitting and receiving antennas, the electrical conductivity of the sand layer, and the dielectric permittivity of the sand layer. This permittivity can be estimated from the initial traveltime. The effects of the layering on the waves in these calculated traces also are observed in field traces, which were collected in layered sediments.

Investigation of the Dielectric Permittivity and Electrical Conductivity of Ce2S3

2018 ◽  
Vol 52 (4) ◽  
pp. 411-413 ◽  
Author(s):  
V. G. Zalessky ◽  
V. V. Kaminski ◽  
S. Hirai ◽  
Y. Kubota ◽  
N. V. Sharenkova
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Permittivity

Acheron's rainbow: Free associations on 75 years of exploration geo-electromagnetics

Geophysics ◽  
2005 ◽  
Vol 70 (6) ◽  
pp. 25ND-31ND ◽  
Author(s):  
Alan C. Tripp
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Permittivity ◽  
Raw Materials ◽  
Effective Means ◽  
Modern Life ◽  
Goods And Services ◽  
The Past

Geophysics has proved to be an effective means of prospecting for the raw materials necessary for modern life. Electromagnetic techniques are the methods of choice when buried treasure has an anomalous electrical conductivity or dielectric permittivity. In the past 75 years, SEG has provided a forum for the usually rational exchange of ideas in electromagnetic prospecting as well as a bazaar for goods and services.

scholarly journals The role of electrical conductivity in radarwave reflection

2020 ◽  
Author(s):  
Slawek M. Tulaczyk ◽  
Neil T. Foley
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Permittivity ◽  
Specular Reflection ◽  
A Priori ◽  
Normal Incidence ◽  
Radar Reflectivity ◽  
Geologic Materials ◽  
Wide Range ◽  
Radar Wave ◽  
The Impact

Abstract. We have examined a general expression giving the specular reflection coefficient for a radar wave approaching a reflecting interface with normal incidence. The reflecting interface separates two homogeneous media, the properties of which are fully described by three scalar quantities: dielectric permittivity, magnetic permeability, and electrical conductivity. The derived relationship indicates that electrical conductivity should not be neglected a priori in glaciological investigations of subglacial materials, and in GPR studies of saturated sediments and bedrock, even at the high end of typical linear radar frequencies used in such investigations (e.g., 100 MHz). Our own experience in resistivity surveying in Antarctica, combined with a literature review, suggests that a wide range of geologic materials can have electrical conductivity that is high enough to significantly impact the value of radar reflectivity. Furthermore, we have given two examples of prior studies in which inclusion of electrical conductivity in calculation of the radar bed reflectivity may provide an explanation for results that may be considered surprising if the impact of electrical conductivity on radar reflection is neglected. The commonly made assumption that only dielectric permittivity of the two media need to be considered in interpretation of radar reflectivity can lead to erroneous conclusions.

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