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Electrical properties of compacted assembly of copper oxide nanoparticles
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In this paper, both dc and ac electrical properties were measured on a compacted nanoparticle assembly and the dc electrical resistivity in the temperature range 140-300K was found to arise due to a variable range hopping conduction mechanism.Abstract:
Cu2O nanoparticles with diameters in the range 6.0-8.6nm were prepared by a chemical method. Both dc and ac electrical properties were measured on a compacted nanoparticle assembly. dc electrical resistivity in the temperature range 140-300K was found to arise due to a variable range hopping conduction mechanism. The ac resistivity variation as a function of frequency (in the range 10kHzto3MHz) and temperature (range 220–320K) was explained on the basis of the power-law exponent in percolating clusters. The interfacial amorphous phase of the nanoparticle assembly appears to control the electrical behavior of the system.read more
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High frequency permeability of ferromagnetic metal composite materials
TL;DR: In this paper, the complex permeability of ferromagnetic metal (cobalt and permalloy) granular composite materials has been studied in the microwave frequency range, and it was shown that high surface electrical resistance can be obtained by the heat-treatment; the eddy current effect in high frequency permeability is suppressed in the high particle content composite materials.
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Evidence of quantum correction to conductivity and variable range hopping conduction in nano-crystalline Cu3N thin film
TL;DR: In this article, the authors investigated the temperature dependent carrier transport properties of nano-crystalline copper nitride thin films synthesized by modified activated reactive evaporation and found that the carrier transport in these films is mainly attributed to the impurity band conduction.
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DFT and photoelectrochemical studies of point defects in passive films on copper
TL;DR: In this article, the authors applied the density functional theory (DFT) using Heyd-Scuseria Ernzerhof (HSE) functional to explore the relationship between band structure and defect type and concentration for ultrathin passive film using Cu2O slab model.
Journal ArticleDOI
High-frequency permeability of Fe-Co and Co granular composite materials
Abstract: The relative complex permeability and permittivity spectra of Fe50Co50 (Permendur) and Co granular composite materials containing heat-treated particles have been studied in the microwave frequency range up to 20 GHz. Fe50Co50 granular composite materials have a larger relative permeability value than Co composites at the same particle content owing to the differences in the magnetizations and the magnetic anisotropies between Fe50Co50 and Co particles. Negative permeability dispersions were observed in both composites at frequencies above 6 GHz. The effect of a dc magnetic field on the permeability spectra revealed that the permeability dispersion of Co composites could mainly be attributed to the gyromagnetic spin resonance in the microwave range. From the relative permittivity spectrum, these two metal granular composites have a dielectric property even at high particle contents.
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Facile synthesis of Cu <sub>2</sub> O nanorods in the presence of NaCl by successive ionic layer adsorption and reaction method and its characterizations
TL;DR: In this paper , the structural, electrical and optical properties of synthesized Cu2O nanorod films have been studied by a variety of characterization tools, including X-ray diffraction.
References
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A.c. conduction in amorphous chalcogenide and pnictide semiconductors
TL;DR: In this article, a comprehensive survey is given of the experimental a.c. data for two types of amorphous semiconductor, namely chalcogenide and pnictide materials, and it is concluded that the behavior at intermediate to high temperatures is well accounted for by the correlated-barrier-hopping model, whereas the low-temperature behaviour is probably due to atomic tunnelling.
Book
Introduction to solid state physics
TL;DR: In this article, the Hartree-Fock Approximation of many-body techniques and the Electron Gas Polarons and Electron-phonon Interaction are discussed.
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Critical Behaviour of Conductivity and Dielectric Constant near the Metal-Non-Metal Transition Threshold
TL;DR: In this article, the metal-non-metal transition takes place when the volume fraction of the metallic phase approaches the percolation threshold, and it is shown that the static dielectric constant diverges near the threshold.
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Nanocrystalline materials an approach to a novel solid structure with gas-like disorder?
TL;DR: In this paper, randomly oriented "nanocrystal" with sizes d below 10 nm, were compacted into a nanocrystalline solid, which consists of crystalline domains and a connective matrix without any short or long range order.