Journal ArticleDOI
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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P-type transparent conducting oxides.
TL;DR: This article provides a comprehensive review on traditional and recently emergent p-TCOs, including Cu(+)-based delafossites, layered oxychalcogenides, nd (6) spinel oxides, Cr(3+-based oxides), and post-transition metal oxides with lone pair state (ns (2).
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Acceptor Levels in p-Type Cu2O: Rationalizing Theory and Experiment
TL;DR: In this paper, the formation of $p$-type defects in transparent conducting oxides was investigated, giving rise to singleparticle levels that are deep in the band gap, consistent with experimentally observed activated, polaronic conduction.
Journal ArticleDOI
Understanding the p-type defect chemistry of CuCrO2
TL;DR: In this article, the authors examined the electronic structure, thermodynamic stability and the p-type defect chemistry of CuCrO2 using density functional theory with three different approaches to the exchange and correlation.
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Modeling the polaronic nature of p-type defects in Cu2O: The failure of GGA and GGA+U
TL;DR: For both methods, however, the positions of calculated transition levels are inconsistent with experimental ionization levels, and neither GGA nor GGA+U are successful in modeling p-type defects in Cu(2)O.
Journal ArticleDOI
Negative permeability spectra in Permalloy granular composite materials
TL;DR: In this article, a negative permeability has been obtained above 5GHz due to the natural magnetic resonance in the 70vol% particle content composite material and the electrical permittivity spectra show a nonmetallic characteristic.
References
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Journal ArticleDOI
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.
Journal ArticleDOI
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.
Journal ArticleDOI
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.