Materials Literature
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We report the structural refinement of large-unit-cell bcc crystalline phases found in Ti-Zr-Ni and Ti-Zr-Fe alloys, which are $1/1$ rational approximants of icosahedral quasicrystals in the same alloys. The structure of the stable $1/1$ phase $W(\mathrm{TiZrNi}),$ lattice constant ${a}_{o}=14.317\AA{},$ determined by…
The surface excitation parameter, which describes the influence of surface excitations by electrons for the vacuum side in electron spectroscopies, has been calculated for electrons of 200–2000 eV energies crossing surfaces of Cu, Ag, Au, Fe, Pd, Ni, MgO and SiO2. These calculations were performed for both incident an…
The heats of formation of BH, BH 2, BH 3, and B 2 H 6 have been obtained from ab initio coupled cluster calculations by using a systematic sequence of correlation consistent Gaussian basis sets. The best values were obtained by extrapolating the finite basis set results to the complete basis set limit and by incorpora…
The central part of the Mg-Al phase diagram was experimentally re-investigated. Between the {gamma} and {beta} phases only one additional intermediate phase could be verified. The other phases reported in literature may be explained by a commensurate modulation of the {gamma} phase ({gamma}`) found recently by electro…
Molecular dynamics simulation has been performed to investigate the microstructure and properties of low angle grain boundaries, employing the embedded atom method(EAM) type interatomic potential for Ni-Al alloy. The energies of the low angle grain boundaries with different dislocation densities were calculated, and t…
We have investigated the behaviour of self-supporting amorphous SiO2 (a-SiO2) thin films under 100keV electron-beam irradiation in a high-dose regime (107-109Cm−2). Electron-energy-loss and energy-dispersive X-ray measurements show that oxygen is preferentially lost during the damage process which leaves the irradiate…
A systematic experimental approach has been used to study rapid sotidification of Ag-Cu alloys with 23, 28.1 (eutectic), and 33 wt-%Cu using a levitation casting technique. The cooling curves were recorded during each experimental run and the microstructure was examined. Different cooling rates were obtained ranging f…
Abstract The title compound has been considered to be isotypic with Ag 0.68 V 2 O 5 , a typical δ vanadium bronze crystallizing in space group C 2/ m . Through hydrothermal synthesis, however, crystals were obtained showing superlattice reflections. Triclinic, C [unk] (No. 2), a = 23.536(2) Å, b = 7.3985(3) Å, c = 8.8…
: We have observed that a slight crystal tilt away from the zone axis paradoxically decreases the dynamical extinction length, as if the electron-crystal interaction increases. This effect disappears at larger tilt angles. Using the simplified channeling theory, this behavior is explained.
The thermonuclear burn-up in deuterium - tritium (DT) mixtures with various D: T ratios is considered. It is shown that the use of small amounts of tritium simplifies the thermonuclear burn-up in the dense deuterium significantly. The general dependence of the critical burn-up parameter upon the D: T ratio, temperatur…
Selection of suitable sewing needle is one of the most important parameters for ensuring an effective and fault‐free sewing process. This task requires good knowledge of basic characteristics of a sewing needle, i.e. needle type, point shape and needle fineness. Also good knowledge of sewing materials is required. The…
The most economical way of protecting pipelines is through the application of organic coatings and wrappings. To make the protection foolproof at holidays and pores, cathodic protection is also applied. At coating holidays, the pipelines act as the cathode generating hydroxyl ion and hydrogen electrochemically. Extens…
High purity (GeS2)8−x (Sb2S3)20(NdCl3)x x=0, 0.01, 0.1, 0.5, glasses were prepared and their optical properties determined. The Ge-Sb-S system dissolves up to 0.5 mol.% of NdCl3 and still forms stable glasses. The structure of these glasses is formed by interconnected GeS4 tetrahedra and SbS3 pyramids as it follows fr…
Macroporous materials with highly uniform pores in the range 50 nm to 20 μm and of any desired porosity up to 90% can be produced using the method introduced here—emulsion templating. The Figure shows an extremely porous poly(acrylamide) gel, one of the many types of materials that can be synthesized using this versat…
Abstract The reactivity of limestone with sulphur dioxide has been evaluated during conditions similar to those existing in a fluidized bed combustor using a fixed‐bed quartz reactor. The reactivity of up to 11 particle sizes of 2 limestones were evaluated, and an exponential decay function was found to best describe…
We studied the orientation of nematic liquid crystals when they were being filled into cells by capillary action. We found that, in the flow front, the liquid crystal was always aligned along the flow direction. Far behind the flow front, the orientation of the liquid crystal depended on the anchoring direction of the…
Abstract Bis(hexafluoroacetylacetonato)copper(II) Cu(hfac)2(=M) reacts with 5-bromo-1,3-phenylenebis(N-tert-butylaminoxyl) 1 to yield a complex formula [M3·12]. The X-ray crystal structure shows that it crystallizes in the space group P1, with a = 12.469(2) Å, b = 15.278(2) Å, c = 11.602(2) Å, α = 104.59(1)°, β = 111.…
IFO is a newly developed computer program which transforms experimental structure factors for disordered materials to atomic distribution functions by employing an image-reconstruction-type technique. The transformation is carried out through a Monte Carlo search for an atomic distribution function which is a smooth,…
Although EIS is widely applied as a technique for monitoring the degradation of polymeric coatings when exposed to acqueous environments, a rigourous theoretical framework has not yet been fully developed. In this paper a mathematical model relating the kinetics of moisture uptake to the changes in the dielectric prop…
Abstract After curing, phenol‐formaldehyde resins were post‐cured at 160°C, 230°C, and 300°C in air for several hours, and then those post‐cured samples were carbonized at 1000°C. The effect of post‐curing on the physical properties and microstructure of the carbonized phenolic resin is reported in this article. The p…