Materials Literature
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Abstract A Taylor-type model for large deformation polycrystalline plasticity is formulated and evaluated by comparing the predictions for the evolution of crystallographic texture and the stress-strain response in simple compression and tension, plane strain compression, and simple shear of initially ‘isotropic’ OFHC…
The operation of the ferroelectric nonvolatile memory field effect transistor is theoretically examined extensively for the first time. The ferroelectric transistor device properties are derived by combining the silicon charge-sheet model of metal-oxide-semiconductor field-effect transistor device operation with Maxwe…
Abstract The evolution of corrosion pits on stainless steel immersed in chloride solution occurs in three distinct stages: nucleation, metastable growth and stable growth. This paper describes the growth of metastable corrosion pits on stainless steel immersed in chloride solution, and their transition to stability. T…
The quantum confinement effect on excitons in quantum dots of indirect-gap materials is investigated and a mechanism that induces an indirect-to-direct conversion of the character of the optical transition is clarified. The exciton transition energy and the exciton binding energy are calculated and found to be in good…
The magnetocrystalline anisotropy energy (MAE) of the pnictide MnSb is investigated by means of the augmented spherical wave method. The spin-orbit coupling enters the variational step of the procedure and the force theorem is applied to determine the dependence of the MAE on the directions of magnetization. The autho…
The results of experimental investigations of the electrical conductivity, magnetoresistance and Hall effect in the semiconductor TlSe with a chain structure are presented. The measurements of electrical conductivity have been carried out in two directions, i.e. parallel and perpendicular to the crystal c axis (the ch…
The authors use an interface potential approach to consider the adsorption of a fluid with long-range interactions onto a substrate of two adjacent spheres. The interplay between prewetting-like thin-thick transitions and capillary condensation is discussed.
New measurements and Monte Carlo simulations of the total coefficients eta + for the backscattering of positrons from elemental solids are reported as a function of atomic number Z between 13 and 82, incident energies E from 1 to 50 keV, and incident angles between 0 degrees and 65 degrees . The measurements and simul…
Perfect single grains of the AlPdMn icosahedral phase have been used for structure determination by X-ray and neutron diffraction. Owing to the large difference between X-ray and neutron scattering factors, information is gained on the atomic positions of the three elements. A model is proposed as deduced from a six-d…
Se 1-x Te x semiconducting glasses have been prepared and characterized by optical, electrical and X-ray measurements. It is found that homogeneous Se 1-x Te x glasses can only be prepared, without any trace of detectable crystallinity, up to x approximately=0.30 by the usual conventional quenching technique. Due to t…
The twin, intrinsic and extrinsic stacking fault energies together with the FCC-HCP structural energy difference are calculated for Al by means of the total energy pseudopotential method. The influence of supercell geometry is controlled by extrapolating the calculated data to infinite cell size. All calculations incl…
Polychalcogenide compounds with open polymeric frameworks are rare, and they represent a class of compounds in which microporosity might be achieved. Microporous frameworks that are not oxide-based are now attracting interest because of the combination of catalytic and electronic properties they may simultaneously pos…
A stability analysis, expressed within the framework of a density functional theory, is employed to calculate the wavelength of the pitch of a chiral nematic liquid crystal. The chiral bodies are represented by a hard convex twisted ellipsoidal core, with and without an encircling isotropic square well. In the present…
Abstract We study the limiting behaviour of the solution of the Cahn-Hilliard equation using ‘energy-type methods'. We assume that the initial data has a ‘transition layer structure’, i.e. uϵ ≈ ± 1 except near finitely many transition points. We show that, in the limit as ϵ → 0, the solution maintains its transition l…
A new class of promising composite materials consisting of sol-gel processed inorganic oxides and organic polymers has been developed over the last several years. These materials have been shown to be homogeneous, mechanically stable and have excellent optical properties. Second-order nonlinear optical properties are…
A novel quarterwave-thick narrow-bandwidth antireflective coating has been developed for both plastic and vitreous substrates by a sol-gel route. This coating has revealed pronounced scratch- and climatic-resistances under adverse conditions. The single-layer coating consists basically of a composite material made of…
A general expression for the energy loss probability in scanning transmission electron microscopy (STEM) is derived. The method uses a Green's function for the incident and scattered electrons and then folds the specimen into a local response function. Our expression is appropriate to any target geometry and dielectri…
Both the temperature and the pressure dependences of the b 4 0 spin-Hamiltonian parameter for RbCaF 3 , CsCaF 3 , RbCdF 3 and TlCdF 3 doped with Gd 3+ have been reported. On the assumption that b 4 0 depends on the metal-ligand distance according to a law b 4 0 approximately r k the following values of k were obtained…
The magnetic structure of TiFe 2 which crystallizes with the C15 Laves phase structure has been determined from neutron diffraction measurements made on both single-crystal and polycrystalline samples. In the antiferromagnetic structure the Fe2 atoms in the (6h) sites with the same z coordinate are coupled ferromagnet…
Atomic force microscope images show that self-assembled monolayers of octadecyltrichlorosilane form on mica by nucleating isolated, self-similar domains. With increasing coverage, the fractal dimension of the growing domains evolves from 1.6 to 1.8. At higher coverage, continued growth is limited by adsorption from so…