Materials Literature
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Direct methods combined with direct-space refinement procedures are the standard tools for ab initio crystal structure solution of macromolecules via diffraction data collected up to atomic or quasi-atomic resolution. An entirely direct-space approach is described here: it includes an automated Patterson deconvolution…
Undoped zinc oxide (ZnO) thin films were grown on sapphire and zirconia [yttria-stabilized zirconia (YSZ)] substrate to investigate the effect of the annealing on luminescence properties. For the films grown on sapphire substrate, the electron concentration increased to 1.6×1019cm−3 as a result of in-diffusion of alum…
The Cyclic Extrusion Compression (CEC) is one of the methods of severe plastic deformation (SPD), used for producing nanomaterials. The CEC method allows materials to be deformed to arbitrarily large strains without changing the initial shape of sample. Large hydrostatic compressive stresses are exerted during deforma…
The magnetic anisotropy of the supramolecular [2 x 2] grid [Co(II)4L4]8+, with a bis(bipyridyl)-pyrimidine-based ligand L, was investigated by single-crystal magnetization measurements at low temperatures. The magnetization curves exhibit metamagnetic-like behavior and are explained by the weak-exchange limit of a min…
The different oxidation behavior of TiC and VC(100) surfaces by molecular oxygen has been investigated by density functional theory with a slab model. From the thermodynamic stability of the final states that involve dissociated O(2), one cannot well explain the experimental observations. Two different oxidation pathw…
KCN etching of the CuxS surface layer formed during the production process of Cu(In,Ga)S2 thin film solar cell absorbers as well as subsequent H2O2∕H2SO4 etching of the Cu(In,Ga)S2 surface have been investigated using x-ray photoelectron spectroscopy, x-ray excited Auger electron spectroscopy, and x-ray emission spect…
A 93% high-yield synthesis of well-dispersed, colorless zirconium dioxide (ZrO(2)) nanocrystals is reported. In this synthesis, hydrolysis and condensation reactions of zirconium(IV) tert-butoxide in the presence of oleic acid (100 degrees C) formed ZrO(2) precursors. The ZrO(2) precursors were made of -Zr-O-Zr- netwo…
Thermomagnetic and magnetocaloric (MC) properties of Ni2MnGa Heusler alloys are found to be very sensitive to small composition variations. It is shown that the temperature behavior of ac susceptibility mimics that of MC properties of the samples. The coincidence of magnetic and structural transformations is found for…
The correlation between the orientation degree of surface crystalline phase and the second-order optical susceptibility, d coefficient for second-harmonic generation, in 30BaO–15TiO2–55GeO2 (BTG55) crystallized glass was investigated using x-ray diffraction measurements and a Maker fringe technique. The d coefficient…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTTailoring the Global Properties of Nanocomposites. Epoxy Resins with Very Low Coefficients of Thermal ExpansionSanty Sulaiman, Chad M. Brick, Christopher M. De Sana, Joshua M. Katzenstein, Richard M. Laine, and Rafil A. BasheerView Auth…
During the last decade it has been shown that severe plastic deformation (SPD) is a very effective for obtaining ultra-fine grained (UFG) and nanostructured materials. The basic SPD methods are High Pressure Torsion (HPT) and Equal Channel Angular Extrusion (ECAE). Recently several new methods have been developed: 3D…
Ultrathin ordered titanium oxide films on a Pt(111) surface have been prepared by reactive deposition and characterized by low-energy electron diffraction and scanning tunneling microscopy (STM). According to the postdeposition annealing condition, three different phases have been prepared which show a wagon-wheel-lik…
Temperature and orientation dependence of dielectric constant and discharging current was investigated in the poled single crystals of (1−x)Pb(Mg1∕3Nb2∕3)O3–xPbTiO3 with x varying from 0.24 to 0.38, furthermore, composition and orientation dependence of the room temperature piezoelectric constant d33 was also summariz…
Abstract Polyether(ester amide)s with poly(propylene oxide) (PPO) and monodisperse poly(hexamethylene terephthalamide) segments were synthesized, and their structure–property relations were investigated. The length of the amide segments was varied from diamide to tetraamide to hexaamide segments, and therefore the num…
This paper examines the challenges which are encountered when using electrical resistivity measurements for characterization of microstructures in aluminum alloys. Experimental examples are provided of electrical resistivity studies conducted on two aluminum alloys, a heattreatable alloy (AA6111) and a non-heat-treata…
The investigation of field emission (FE) properties of carbon nanotube film reveals a strong dependency on the density and its aspect ratio. Nonlinearity in the Fowler-Nordheim (F–N) plot has been explained in terms of change in work function of carbon due to heating during FE. A characteristic knee in the F-N plot, s…
Eu 3 + -doped TiO2 films were prepared on silicon substrates by sol-gel method. Anatase and rutile phases appear when the samples were heat treated in oxygen atmosphere at 500 and 900°C, respectively. Photoluminescence (PL) properties were investigated under the excitation of 325nm He–Cd laser. Visible PL peaking at 5…
In order to develop optical fiber hydrogen sensors, thin film materials with a high optical contrast between the metallic and hydrided states are needed. Magnesium exhibits such a contrast but cannot be easily hydrogenated at room temperature. However, thin films of Pd-doped Mg (MgPdy with 0.023⩽y⩽0.125) prepared by m…
Transport and thermoelectric properties of CuSbSe2 and CuM0.02Sb0.98Se2 (M=Ti,Pb) have been investigated at the temperatures from 5to310K. The results indicated a good linear relationship between logarithm of dc resistivity and reciprocal of temperature existed for CuSbSe2 at the temperatures above ∼73K and below ∼62K…
A family of glasses suitable for ultrabroadband Raman amplifications was designed and fabricated. In addition to the bandwidth the gain characteristics of these glasses are expected to be much higher than those of the silica based materials. The thermal stabilities of these glasses in view of fiber fabrication were di…