Materials Literature
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Second harmonic generation (SHG) measurements were performed in the reflection geometry using the femtosecond Ti:sapphire laser at the wavelength of 810nm for Pb0.35Sr0.65TiO3 films, which were epitaxially deposited on (001) MgO substrates by pulsed laser ablation under different oxygen pressures. We formulated the pr…
The wavelength-dependent photoluminescence (PL) evolution of CdSe∕ZnS (core/shell) nanoparticles (NPs) was investigated from the viewpoint of excitation wavelength dependence. In addition, the mechanisms involved in the photoinduced changes of the NP PL spectrum are discussed. The NPs of CdSe∕ZnS placed on a thin film…
The two-dimensional Fourier transform (2D-FT) is well suited to the extraction of features to differentiate image texture, and the classification of images based on information acquired from the frequency domain provides a complementary method to approaches based within the spatial domain. The intensity, I , of the Fo…
This article presents a metamaterial for ballistic electrons, which consists of a quantum barrier formed in a semiconductor with negative effective electron mass. This barrier is the analog of a metamaterial for electromagnetic waves in media with negative electrical permittivity and magnetic permeability. Besides app…
Nanoporous alumina structures were fabricated on quartz crystal microbalances (QCMs) by electrochemically anodizing aluminum electrodes which had a typical thickness of 13μm. By varying the temperature and voltage of anodization, the diameter of the cylindrical pores could be controlled in the range of 12–40nm. Proper…
In order for magnesium to continue to grow, all forms of magnesium scrap need to be recycled – for both economic and environmental reasons. This paper extensively reviews the techniques for the refining and recycling of magnesium. Removal of inter-metallic elements and inclusions through gas fluxing, filtration and ot…
Epitaxial lead iron niobate thin films with thicknesses of 50nm<t<500nm have been deposited by pulsed laser deposition. We have identified the deposition conditions that result in insulating layers. These critical conditions are essential to (i) prevent semiconducting resistivity characteristics, (ii) ac…
The cooperative collective effects of strain-induced martensitic variant accommodation in nano- and micrograined polycrystalline TiNi shape memory alloys were discovered to form macroscopic strain-induced shearing bands—the Lüders-like deformation bands. We use the in situ electron backscattered diffraction technique…
The formation of yellow-light-emitting porous silicon (PSi) layers in a HF solution with adding an oxidizing agent FeCl3 is presented. The PSi layers are formed by photoetching under Xe lamp illumination. The photoluminescence (PL) intensity is strongly dependent on the FeCl3 concentration and shows a maximum at x∼25…
We have studied the adsorption and dissolution phenomena of sodium halide salts (NaF, NaCl, and NaBr) at the surface of amorphous D 2 O−ice films for the temperature range 105−140 K by the techniques of low-energy sputtering, reactive ion scattering, and temperature-programmed desorption mass spectrometry. These salts…
In the present paper, the authors focus on proton conduction pathways in a cubic perovskite KTaO(3) and an orthorhombic perovskite SrZrO(3). Density functional theory with a generalized gradient approximation is used to find proton binding sites. The nudged elastic band method is used to find transition states between…
A new module has been developed for the widely used General Utility Lattice Program ( GULP ). The phonon-based theory developed by Chung & Thorpe [ Phys. Rev. B (1999), 59 , 4807–4812] to calculate pair distribution function (PDF) peak widths has been utilized to give a selection of commonly used correlation funct…
Electromigration (EM) is a major failure mechanism in ultralarge-scale integration interconnections. Various atomic migration mechanisms due to the electron wind force, temperature gradients, and thermomechanical stress gradients are involved during an EM failure process. In this study, a methodology that combines a M…
The GEST software has been developed for the solution of molecular crystal structures from powder diffraction data. In this package, a genetic algorithm is used for global optimization to search for the structural model. For more efficient calculation time, a modified Bragg R factor is used as the evaluation function…
The high temperature magnetization behavior of an air sintered nanocrystalline ZnO:Co (5at.%) sample while it is subjected to thermal cycles in vacuum/air ambient is reported in the present paper. The pristine air sintered sample exhibits intrinsic room temperature ferromagnetism. Upon vacuum annealing, the magnetizat…
Microstructures evolution, mechanical properties, transformation behaviors and shape memory effects of low niobium content (5at.%) NiTiNb shape memory alloys were investigated. It was found that the amount of Nb resolved in the NiTi matrix is closely related to the Ni/Ti ratio and has significant influence on the mech…
Vitreous silica, as high temperature resistant material, has not been completely studied with the influence of extreme working conditions due to experimental limitations. In this work, the structure correlations of vitreous silica were investigated by molecular dynamics method at elevated temperatures from 0 K to 4000…
Four fluorinated polyacrylate dispersions, which based on chlorotrifluoroethylene (CTFE), acrylic acid (AA), vinyl acetate (VAc) and ethenyltriethoxysilane (ETOS) as monomers, are synthesized by free radical polymerization. The influence of xenon lamp and UV-light aging on the film with the fluorine content is discuss…
The microstructure and mechanical properties of Mg-3wt％Nd-0.2wt％Zn-0.4wt％Zr alloy in as-cast, solution-treated and solution-treated + peak-aged were investigated. The alloy had a cast structure with large intergranular Mg12Nd phase between the α-Mg matrix. After solution-treated, the intergranular Mg12Nd phase disappe…
Cyclic extrusion is a new bulk deformation method. It consists of two steps. In the first step a part of the work piece will be indirectly extruded. In the second step the extruded part will be backwards pressed into the bulk again so that the original shape of the work piece is retained. Similar to ECAP, cyclic extru…