Materials Literature
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Low vacuum scanning electron microscopy (SEM) is a high-resolution technique, with the ability to obtain secondary electron images of uncoated, nonconductive specimens. This feat is achieved by allowing a small pressure of gas in the specimen chamber. Gas molecules are ionized by primary electrons, as well as by those…
The essential role of strain in determining the electronic states of perovskite manganites is clearly demonstrated in the form of anisotropic and substrate-dependent crossover of a first-order phase transition in charge-orbital ordered epitaxial thin films of ${({\mathrm{Nd}}_{1\ensuremath{-}x}{\mathrm{Pr}}_{x})}_{0.5…
[reaction: see text] The behavior of porphyrins as dipolarophiles in 1,3-dipolar cycloadditions with azomethine ylides was studied. Depending on the nature of the substituent groups on the porphyrin macrocycles, the reaction can give monoadducts (chlorins) or bisadducts (isobacteriochlorins and bacteriochlorins). When…
An in-depth analysis of the deterioration mechanisms in high-strength wires of suspension bridge cables is presented. Accelerated cyclic corrosion tests were conducted to assess the relative effect of corrosion on galvanized and ungalvanized wires. Samples were corroded under various levels of sustained loads in a cab…
While electronic and spectroscopic properties of self-assembled In_{1-x}Ga_{x}As/GaAs dots depend on their shape, height and alloy compositions, these characteristics are often not known accurately from experiment. This creates a difficulty in comparing measured electronic and spectroscopic properties with calculated…
Scanning tunneling microscopy images of hydrogen-terminated Si(110) surfaces are studied using first-principles calculations. Our results show that the calculated filled-state images and local density of states are consistent with recent experimental results, and the empty-state images appear significantly different f…
Patterns generated by a colloidal suspension of nanospheres drying on a frictional substrate are studied by experiments and computer simulations. The obtained two-dimensional self-assembled structures are commonly used for nanosphere lithography. A spring-block stick-slip model is introduced for simulating the phenome…
We report quasiparticle-energy calculations of the electronic bandstructure as measured by valence-band photoemission for selected II-VI compounds and group-III-nitrides. By applying GW as perturbation to the ground state of the fictitious, non-interacting Kohn-Sham electrons of density-functional theory (DFT) we syst…
We report quasiparticle-energy calculations of the electronic bandstructure as measured by valence-band photoemission for selected II-VI compounds and group-III-nitrides. By applying GW as perturbation to the ground state of the fictitious, non-interacting Kohn-Sham electrons of density-functional theory (DFT) we syst…
In this letter we describe a method of extending an existing phase field model of polycrystalline solidification from two to three dimensions (3D).
We propose a nonequilibrium Green's function approach to study the spin-Hall effect in a two-dimensional electron system with both the Rashba and Dresselhaus spin-orbit couplings. By taking into account the long-range electron-impurity scattering, the derived kinetic equations are solved numerically. It is found the v…
A nonequilibrium Green's functions approach to spin-Hall effect is developed in a diffusive two-dimensional electron system with Rashba spin-orbit interaction. In the presence of long-range impurities, the coupled quantum kinetic equations are solved analytically in the self-consistent Born approximation. It is shown…
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionORIGINAL ARTICLEThis notice is a correctionWhat Are Batteries, Fuel Cells, and Supercapacitors? (Chem. Rev.2003, 104, 4245−4269. Published on the Web 09/28/2004.)Martin Winter and Ralph J. BroddCite this: Chem. Rev. 2005, 105, 3, 1021Publication Date (Web):February 1…
Anomalous Raman modes have been reported in several recent papers dealing with doped- and undoped-ZnO layers grown by different methods. Most of these anomalous Raman modes have been attributed to local vibrational modes of impurities or defects. However, we will show that most of the observed modes correspond to wurt…
The effect of Ti substitution on the thermoelectric properties of (Zr,Hf)NiSn half-Heusler compounds was studied. It was found that the substitution of Ti for (Zr,Hf) reduced the thermal conductivity significantly to a low value of 3.0W∕mK at room temperature. In addition, a remarkable enhancement of the Seebeck coeff…
We investigated the resonant Auger process near the $\mathrm{V}$ $2{p}_{3∕2}$ edge in vanadium metal. Attention is centered on the onset of Auger decays and their behavior below the $2{p}_{3∕2}$ resonance. The $2{p}_{3∕2}3d3d$ decay has a crossover from the Raman-Auger to the normal Auger regime at the $2p$ ionization…
The enzyme-catalyzed condensation is reviewed in view of its use in polymer modification reactions. The formation of esters and amides is most facile when (1) the reaction is carried out in a non-aqueous medium, and (2) the acyl donor contains a good leaving group. However, it is sometimes possible to relax these requ…
Abstract New phosphorus-rich phosphorus selenides P 14+x Se ( x = 1, 5) were synthesized by reaction of amorphous red phosphorus and SeO 2 . The crystal structures of P 15 Se and P 19 Se were solved from single-crystal X-ray data (space group Pnma (No. 62); P 15 Se: a = 9.963(2) Å, b = 3.231(1) Å, c = 13.412(3) Å; P 1…
Abstract The real stucture of a new crystalline high temperature phase, metastable at room temperature, in the system sodium – bismuth – oxygen, β -Na 3 BiO 4 , was determinated using high resolution X-ray powder diffraction, pair distribution function analysis, and high resolution transmission electron microscopy. β…
We prepared polycrystalline samples of β-KxBa1−xCu2S2 (x=0,0.05,0.1) with a natural superlattice structure and measured the thermoelectric properties from room temperature to about 850K. The Seebeck coefficients are positive in the whole temperature range. The electrical resistivity and Seebeck coefficient decrease wi…