Frequency spectrum of the electrical properties of seawater-saturated ocean crust and oceanic island basalts

1978 ◽  
Vol 15 (9) ◽  
pp. 1489-1495 ◽  
Author(s):  
M. J. Drury
Keyword(s):  
Electrical Properties ◽  
Frequency Spectrum ◽  
Conduction Mechanism ◽  
Oceanic Island ◽  
Pore Fluid ◽  
Membrane Polarization ◽  
Conduction Mechanisms ◽  
Metallic Mineral ◽  
Dominant Conduction Mechanism ◽  
Oceanic Island Basalts

The frequency spectrum of electrical properties of seawater-saturated oceanic crust and oceanic island basalts has been studied. All samples showed at least two of three possible polarization mechanisms: dielectric, membrane, and electrode. The membrane polarization appears to result from the presence of clay minerals, which frequently line or block pores and cracks in the samples. The dominant conduction mechanism in the samples is pore fluid (seawater) conduction, but the electrical properties of samples containing clay are modified by the clay. The results support the suggestion by Drury that a model of three conduction mechanisms acting approximately in parallel—pore fluid, clay mineral, and metallic mineral conduction—describes the electrical properties of seawater-saturated basalts.

scholarly journals A Review on Conduction Mechanisms in Dielectric Films

2014 ◽  
Vol 2014 ◽  
pp. 1-18 ◽  
Author(s):  
Fu-Chien Chiu
Keyword(s):  
Electrical Properties ◽  
Conduction Mechanism ◽  
Dielectric Materials ◽  
Dielectric Films ◽  
Physical Parameters ◽  
Dielectric Relaxation Time ◽  
Trap Level ◽  
Dielectric Interface ◽  
Conduction Mechanisms ◽  
Limited Conduction

The conduction mechanisms in dielectric films are crucial to the successful applications of dielectric materials. There are two types of conduction mechanisms in dielectric films, that is, electrode-limited conduction mechanism and bulk-limited conduction mechanism. The electrode-limited conduction mechanism depends on the electrical properties at the electrode-dielectric interface. Based on this type of conduction mechanism, the physical properties of the barrier height at the electrode-dielectric interface and the effective mass of the conduction carriers in dielectric films can be extracted. The bulk-limited conduction mechanism depends on the electrical properties of the dielectric itself. According to the analyses of bulk-limited conduction mechanisms, several important physical parameters in the dielectric films can be obtained, including the trap level, the trap spacing, the trap density, the carrier drift mobility, the dielectric relaxation time, and the density of states in the conduction band. In this paper, the analytical methods of conduction mechanisms in dielectric films are discussed in detail.

Synthesis, optical, and electrical properties of starch/chitosan/NaTiO3 bio-nanocomposites modified with ErCl3

2021 ◽  
Author(s):  
Adel M. El Sayed ◽  
Samy El-Gamal
Keyword(s):  
Electrical Properties ◽  
Smart Materials ◽  
Conduction Mechanism ◽  
Industrial Applications ◽  
Solid Polymer Electrolytes ◽  
Solid Polymer ◽  
Optical And Electrical Properties ◽  
Casting Method ◽  
Dielectric Parameters ◽  
Electron Effective Mass

Abstract Solid polymer electrolytes (SPEs) based on nanocomposites are attracting increasing attention due to their technological and industrial applications. In the present work, a facile aqueous casting method was utilized for the preparation of a starch-chitosan blend loaded with nanosized NaTiO3 (NTO) and co-mixed with ErCl3 (EC) salt. The interactions between OH group of starch and N–H group of chitosan with NTO and EC, and the films' crystallinity and surface morphology were studied by FTIR, XRD, and SEM. UV-Vis-NIR measurements showed the indirect (direct) optical band gaps decreased from 3.4 to 2.0 eV (4.5 to ~ 2.5 eV), i.e., ~ 41–44 % shrinking. At the time that the films maintained a reasonable transmittance. The optical constants of the films; extinction coefficient, refractive index, and the carrier’s concentration to the electron effective mass (N/m*) are reported. N/m* of the pure blend was 4.85 x 1039 (kg-1 m-3) increased to 1.64 times and 2.8 times after loading with 1.0% NTO and 20% EC, respectively. Various dielectric parameters (dielectric constant ε', dielectric loss ε'', ac conductivity σac, and dielectric moduli M' & M'') were evaluated in the frequency range 5 Hz - 1 MHz and temperatures of 298 - 353 K. The conductivity (σac) of the blend increased from 1.10×10-3 S/cm to 8.17×10-3 S/cm after modifying with 20% EC, i.e., became 8 times greater. Moreover, the influence of NTO and EC on the conduction mechanism and Cole-Cole plots are discussed. The improvements in the optical and electrical properties of EC/NTO/blend illustrate the possibility of extending the applications of these smart materials to include optoelectronic devices, batteries, and supercapacitors.

Electrical properties and conduction mechanism of in situ HCl-doped emeraldine salt polyaniline films deposited on n-ZnS/p-Si(100)

2018 ◽  
Vol 5 (7) ◽  
pp. 15180-15185
Author(s):  
Kathrina P. Gumahad ◽  
Reynaldo M. Vequizo ◽  
Majvell Kay G. Odarve-Vequizo ◽  
Bianca Rae B. Sambo-Fabricante
Keyword(s):  
Electrical Properties ◽  
Conduction Mechanism ◽  
Emeraldine Salt ◽  
Polyaniline Films

scholarly journals Poole-Frenkel Conduction in Cu/Nano-SnO2/Cu Arrangement

2011 ◽  
Vol 2011 ◽  
pp. 1-4 ◽  
Author(s):  
Hossein Mahmoudi Chenari ◽  
Hassan Sedghi ◽  
Mohammad Talebian ◽  
Mir Maqsoud Golzan ◽  
Ali Hassanzadeh
Keyword(s):  
Electrical Properties ◽  
Room Temperature ◽  
Tin Dioxide ◽  
Current Flow ◽  
Sandwich Structures ◽  
Conduction Band Edge ◽  
Flow Mechanism ◽  
Conduction Mechanisms ◽  
Current Voltage ◽  
Limited Conduction

It is well known that metal/Tin-dioxide/metal sandwich structures exhibit a field-assisted lowering of the potential barrier between donor-like center and the conduction band edge, known as the Poole-Frenkel effect. This behavior is indicated by a linear dependence of Iog  on , where is the current density, and is the applied voltage. In this study, the electrical properties of Cu/nano-SnO2/Cu sandwich structures were investigated through current-voltage measurements at room temperature. Also, an attempt to explore the governing current flow mechanism was tried. Our results indicate that noticeable feature appearing clearly in the current-voltage characterization is the Poole-Frenkel and space-charge-limited conduction mechanisms.

Effects of Additive Elements on Electrical Properties of Tantalum Oxide Films.

1995 ◽  
Vol 378 ◽  
Author(s):  
Hisayoshi Fujikawa ◽  
Yasunori Taga
Keyword(s):  
Electrical Properties ◽  
Conduction Mechanism ◽  
Defect Density ◽  
Tantalum Oxide ◽  
Composite Films ◽  
Current Voltage ◽  
Current Voltage Characteristics ◽  
Electrical Conduction Mechanisms ◽  
Insulating Properties ◽  
Nordheim Tunneling

AbstractTa2O5-based composite films prepared by magnetron sputtering have been investigated with respect to their dielectric properties. As additive third oxides, Y2O3 and WO3 were found to be effective in improving insulating properties without decreasing their dielectric constant. Furthermore, electrical properties of Ta2O5-Y2O3 films were investigated by measuring the current-voltage characteristics in the temperature range from 100 to 330 K. Measurement of temperature dependence of the leakage current revealed that the conduction mechanism at RT changed from the Poole-Frenkel type to the Fowler-Nordheim tunneling type by adding Y2O3 into Ta2O5. Based on the detailed analysis of the results, it is concluded that the addition of Y2O3 into the Ta2O5 film is effective in the reduction of defect density without high-temperature annealing and the alteration of electrical conduction mechanisms of the films.

Electrical properties and conduction mechanism of ZrO2 films on Si1-yCy

2003 ◽  
Author(s):  
G. K. Dalapati ◽  
S. K. Samanta ◽  
S. Chatterjee ◽  
P. K. Bose ◽  
S. Varma ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Conduction Mechanism
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