Materials Literature
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The photoluminescence decay in amorphous semiconductors is described by power law $t^{-delta}$ at long times. The power-law decay of photoluminescence at long times is commonly observed but recent experiments have revealed that the exponent, $delta sim 1.2-1.3$, is smaller than the value 1.5 predicted from a geminate…
Electronic structure calculations for atomic wire of metals like Al, Ga and In are performed for a patterned dihydrogeneted Si(001):1 $\times$ 1 in search of structures with metallic behavior. The dihydrogeneted Si(001) is patterned by depassivating hygrozen atoms only from one row of Si atoms along the [1$\bar{1}$0]…
We present a unified band structure model to explain magnetic ordering in Mn-doped semiconductors. This model is based on the $p$-$d$ and $d$-$d$ level repulsions between the Mn ions and host elements and can successfully explain magnetic ordering observed in all Mn doped II-VI and III-V semiconductors such as CdTe, G…
We present exact electromagnetic solitary pulses that can be experimentally obtained within nonlinear left-handed metamaterials. The effect of pulse decoherence on the modulation instability of partially incoherent electromagnetic waves is also investigated. The results may contribute to a better understanding of nonl…
Formation of MnAs quantum dots in a regular ring-like distribution has been found on MBE-grown (GaMn)As surfaces after low-temperature annealing under As capping. The Mn was supplied by out-diffusing Mn interstitials from (GaMn)As. With 5 at% substitutional Mn the quantum dots appeared for (GaMn)As layers thicker than…
his study is an investigation of spin wave spectrum in macrostructures composed of two ferromagnetic materials and showing a 3D periodicity: spherical ferromagnetic grains disposed in the nodes of a 3D crystal lattice are embedded in a matrix with different ferromagnetic properties. Frequency ranges forbidden to spin…
Frequency dependence of the dielectric constant of complex perovskite oxide Ba(1-x)La(x)Ti(1-x)Cr(x)O3 (BLTC) ceramics with the composition ratio 0.4<= x <= 0.7 is precisely measured in the temperature range from 20 K to 300 K, and the dielectric relaxation is found to be quite similar to that of CaCu3Ti4O12 (CCTO), w…
Is this place taken? A mechanism has been proposed for the formation of methanol from CO and H2 on ZnO surfaces in which CO is adsorbed at oxygen vacancies on the heterogeneous catalyst (see picture: C red, H white, O gray, Zn black). The active sites are blocked when CO2 is added to the gas mixture.
The influence of phase-change material composition on amorphous phase stability, crystallization rate, nucleation probability, optical constants and media noise is reported for materials with a growth dominated crystallization mechanism. Two material classes have been studied, doped Sb–Te and doped Sb-based compositio…
Abstract In the petroleum industry, corrosion control with inhibitors is typically achieved with continuous injection or via batch applications at regular intervals. Numerous variables can affect the application of batch corrosion inhibitors. This laboratory autoclave study examines the effects of the type of chemistr…
Abstract In selecting materials for corrosive sour oil field environments, both age-hardened and cold-worked solid solution nickel-base alloys offer many advantages such as high-strength, toughness and excellent corrosion resistance. Alloy 028 (UNS N08028), alloy 825 (UNS N08825), alloy G-3 (UNS N06985), alloy 050 (UN…
Abstract Bad application of drill pipe and electrical wireline inspection procedures was the main cause of corrosion failures in the presence of acid gases H2S. These failures were located in wells FUC-46 and CHL-07x in Furrial and Chaguaramal Fields at the Northern District of Venezuela. The corrosion failures were c…
Abstract Corrosion testing depends on the extent and the type of information desired and the environmental conditions expected in service for the subject material. Corrosion in marine environments is dependent on various factors. Understanding how these factors interact and affect materials performance is essential in…
Abstract All grades and conditions of stainless steel are susceptible to SCC in high temperature water, whether deaerated or aerated; high H2 or low; theoretical purity water, buffered or contaminated; lower temperature or higher; etc. However, the kinetics of SCC growth vary markedly with stress intensity, yield stre…
Abstract The objectives of this study are to evaluate the corrosion behavior of candidate corrosion-resistant alloys in less oxidizing or reducing supercritical water (SCW) environment containing hydrogen chloride and to understand the corrosion mechanism for determining the corrosion resistance of these alloys in the…
Abstract A significant percentage of the corrosion failures in many industries are caused or accelerated by the effects resulting from the activities of specific microorganisms. In aqueous environments, microorganisms tend to attach themselves to metal surfaces and form biofilms. These biofilms create nonuniform surfa…
Abstract An erosion-corrosion study has been performed for a 13Cr alloy in liquid-gas multiphase flow conditions with CO2 saturated brine and sand particles. Pure erosion and erosion-corrosion tests were conducted for low sand concentrations at both 76°F (24.4°C) and 150°F (65.6°C). Results were compared to previous d…
Abstract Often, the corrosion of carbon steel in aqueous environments containing CO2 involves the formation of solid iron carbonate, FeCO3, as corrosion product. The goal of this work is to establish the experimental conditions, pH and temperature, under which stable, protective corrosion product layers form in brine…
Abstract In this paper a two-dimensional (2-D) stochastic localized CO2 corrosion model is proposed, which describes the balance of two processes: corrosion (leading to metal loss) and precipitation (leading to metal protection). The model is able to predict localized corrosion of carbon steel in CO2 containing enviro…
Abstract In condensed water, the free acetic acid content (HAc) is physically dissolved from the gas (or oil) phase, and this induces an overacidification of the CO2 solution. When HAc becomes the dominant acid, this increases the solubility of corrosion products, i.e. the iron content Fesat at the saturation of corro…