5.2.3.5 Electrical resistivities

2005 ◽  
pp. 243-244
Author(s):  
E. Burzo
Keyword(s):  
Electrical Resistivities

scholarly journals Optoelectronic Properties of Ultrathin Indium Tin Oxide Films: A First-Principle Study

Crystals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 30
Author(s):  
Xiaoyan Liu ◽  
Lei Wang ◽  
Yi Tong
Keyword(s):  
Film Thickness ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Density Functional ◽  
Optoelectronic Properties ◽  
Surface Strain ◽  
Strain Effect ◽  
First Principle ◽  
Electrical Resistivities ◽  
Ito Films

First-principle density functional theory simulations have been performed to predict the electronic structures and optoelectronic properties of ultrathin indium tin oxide (ITO) films, having different thicknesses and temperatures. Our results and analysis led us to predict that the physical properties of ultrathin films of ITO have a direct relation with film thickness rather than temperature. Moreover, we found that a thin film of ITO (1 nm thickness) has a larger absorption coefficient, lower reflectivity, and higher transmittance in the visible light region compared with that of 2 and 3 nm thick ITO films. We suggest that this might be due to the stronger surface strain effect in 1 nm thick ITO film. On the other hand, all three thin films produce similar optical spectra. Finally, excellent agreement was found between the calculated electrical resistivities of the ultrathin film of ITO and that of its experimental data. It is concluded that the electrical resistivities reduce along with the increase in film thickness of ITO because of the short strain length and limited bandgap distributions.

scholarly journals A Review: Carbon Nanotube-Based Piezoresistive Strain Sensors

2012 ◽  
Vol 2012 ◽  
pp. 1-15 ◽  
Author(s):  
Waris Obitayo ◽  
Tao Liu
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Composite Films ◽  
Strain Sensors ◽  
Voltage Response ◽  
Strain Sensing ◽  
Multiwalled Carbon ◽  
Sensing Applications ◽  
Mechanical Deformations ◽  
Electrical Resistivities

The use of carbon nanotubes for piezoresistive strain sensors has acquired significant attention due to its unique electromechanical properties. In this comprehensive review paper, we discussed some important aspects of carbon nanotubes for strain sensing at both the nanoscale and macroscale. Carbon nanotubes undergo changes in their band structures when subjected to mechanical deformations. This phenomenon makes them applicable for strain sensing applications. This paper signifies the type of carbon nanotubes best suitable for piezoresistive strain sensors. The electrical resistivities of carbon nanotube thin film increase linearly with strain, making it an ideal material for a piezoresistive strain sensor. Carbon nanotube composite films, which are usually fabricated by mixing small amounts of single-walled or multiwalled carbon nanotubes with selected polymers, have shown promising characteristics of piezoresistive strain sensors. Studies also show that carbon nanotubes display a stable and predictable voltage response as a function of temperature.

The electrical resistivity of lithium-6

1961 ◽  
Vol 263 (1314) ◽  
pp. 407-419 ◽  
Keyword(s):  
Electrical Resistivity ◽  
Isotopic Composition ◽  
Specific Heat ◽  
Room Temperature ◽  
Natural Isotopic Composition ◽  
Square Roots ◽  
Conduction Electrons ◽  
Ionic Mass ◽  
Theoretical Predictions ◽  
Electrical Resistivities

The electrical resistivities of lithium -6 and lithium of natural isotopic composition have been studied between 4°K and room temperature. In addition, their absolute resistivities have been carefully compared at room temperature. These measurements show that the effect of ionic mass on electrical resistivity agrees with simple theoretical predictions, namely, that the properties of the conduction electrons in lithium do not depend on the mass of the ions, and that the characteristic lattice frequencies for the two pure isotopes are in the inverse ratio of the square roots of their ionic masses. A comparison with the specific heat results of Martin (1959, 1960), where the simple theory is found not to hold, indicates the possibility that anharmonic effects are present which affect the specific heat but not the electrical resistivity.

Electrical Resistivities of Some Spinel Ferrites

1977 ◽  
Vol 60 (1-2) ◽  
pp. 88-89 ◽  
Author(s):  
U. ROY ◽  
R. K. WILLIAMS ◽  
W. E. BRUNDAGE ◽  
F. J. WEAVER
Keyword(s):  
Spinel Ferrites ◽  
Electrical Resistivities

Microstructure, Mechanical Properties, and Electrical Resistivities of Mica Glass-Ceramics with Flake Phlogopite and Waste Glass

2014 ◽  
Vol 602-603 ◽  
pp. 640-643
Author(s):  
Yu Fei Chen ◽  
Yan Gai Liu ◽  
Xiao Wen Wu ◽  
Zhao Hui Huang ◽  
Ming Hao Fang
Keyword(s):  
High Speed ◽  
Sintering Temperature ◽  
Raw Materials ◽  
Glass Ceramics ◽  
Waste Glass ◽  
Raw Material ◽  
Bending Test ◽  
Electric Locomotive ◽  
Molding Process ◽  
Electrical Resistivities

Mica glass-ceramics can be applied in all kinds of electrical equipment, locomotive internal circuits in high-speed rail, ordinary electric locomotive and subway locomotive. In this study, mica glass-ceramics were prepared by sintering process using flake mica and waste glass as the main raw material with low cost. Different mica glass-ceramic samples were fabricated by changing the formula of raw materials, molding process and sintering temperature. X-ray diffraction, scanning electron microscopy, three-point bending test, and balanced-bridge technique were applied to investigate the phase, microstructure, mechanical and electrical resistivities of the samples, respectively. The results show that the optimum sintering temperature is 900 to 1000 °C holding for two hours, the desirable ratio is 70 wt% of mica powder while 30 wt% of glass powder. In that condition the sample could be less porosity, high flexural strength (63.3 MPa) and eligible electrical resistivity (0.4×1013 Ω·cm).

scholarly journals Normal spectral emissivity of liquid Al-Ti binary alloys

2020 ◽  
Vol 48 (5-6) ◽  
pp. 423-438
Author(s):  
JUERGEN BRILLO ◽  
JOHANNA J. WESSING ◽  
HIDEKAZU KOBATAKE ◽  
HIROYUKI FUKUYAMA
Keyword(s):  
Temperature Dependence ◽  
Reasonable Agreement ◽  
Spectral Emissivity ◽  
Liquid System ◽  
Normal Spectral Emissivity ◽  
Binary Liquid System ◽  
Binary Liquid ◽  
Electrical Resistivities ◽  
Existing Data ◽  
Good Agreement

The normal spectral emissivity ε of four compositions in the Al-Ti binary liquid system was measured in dependence of the wavelength and temperature. It was found that all compositions show negligible temperature dependence. At a wavelength of 940 nm, the emissivity amounts to 0.37, 0.40, 0.32, and 0.31 for Ti, Al20Ti80, Al50Ti50, and Al70Ti30, respectively. The dependence of the emissivity on composition is in good agreement with literature data of binary and multi-component Al-Ti-based alloys. Using the classical Drude model, electrical resistivities are predicted for the Al-Ti system from the measured emissivities. Comparison with existing data from literature for Al show reasonable agreement.

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