Materials Literature
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Pyrolytic dehydrochlorination of the electrical cable insulation Hypalon was studied as a function of time and temperature. The chlorine evolution was determined separately by means of on-line activity measurements and by neutron activation analysis in the temperature range 200°C to 300°C, with one test conducted at 5…
The absorption and phosphorescence spectra of porphin and its complexes with internal (Mg, Zn) and external heavy atoms (Ne, AR, Kr, and Xe) are calculated by the B3LYP density functional method with the 3-21G basis set and taking into account the linear and quadratic responses. A reasonable agreement with experiment…
As a general rule, saturated hydrocarbons are unable to bind an electron, i.e., their electron affinities are negative, but the corresponding perfluorinated molecules can have significant electron affinities, especially in the case of branched and ring systems. Four different density functional theory (DFT) methods in…
The magnetic, magnetoelectric, and magnetoelastic properties of ErMn2O5 single crystals have been studied at low temperatures and strong magnetic fields (up to 250 kOe) and compared to the analogous results obtained previously for YMn2O5. Based on these data, the possible mechanisms of various spontaneous and magnetic…
:Los Alamos National Laboratory (LANL) has been tasked to produce 120 kg of plutonium as highly purified PuO2 for the European Mixed Oxide (MOX) Lead Test Assembly managed by Duke, COGEMA, Stone & Webster (DCS). To meet stringent and challenging technical requirements for PuO2 production, the LANL aqueous polishing te…
Post-irradiation annealing studies indicate small defect clusters may be a potential contributor to IASCC. In this study, small defect clusters and their behavior during annealing are examined. A CP-304 SS alloy was irradiated with 3.2 MeV protons to 0.17 dpa at <75°C. The increase in hardness after 0.17 dpa at <75°C…
Abstract In oxides the stabilization of the highest oxidation states n+ of transition metals leads to the stabilization of strong covalent M n+ ‐O bonds. Such very covalent bonds can induce electronic phenomena as spin transitions through the increase of the local crystal‐field energy (Dq) or in the specific case of a…
Zinc oxide crystals were grown on a sapphire substrate in silica glass ampoules by Chemical Vapour Transport using Contactless Crystal Growth Method. The temperature field and geometrical dimensions applied previously to PVT growth of other zinc and cadmium-based II–VI and lead-based IV–VI compounds were found to be a…
Abstract Smectites are considered to be an important component in backfill barriers due to their marked swelling and high cation exchange capacity. Both properties are affected considerably when these clays transform under natural conditions. However, we have recently described a chemical interaction between high-acti…
The thermo-optic coefficient (dn∕dT) of porous silicon has been measured. The measurements are based on a simple technique. The experimental data, in the wavelength range between 500 and 1100nm and at different porosities, have been compared with the Bruggeman and Landau–Lifshitz models. The results show good agreemen…
Carbon nanotubes (CNTs) were synthesized using microwave plasma-enhanced chemical vapor deposition. Co nanoparticles as catalyst were prepared using excimer laser ablation. Vertically aligned, dense CNT films were grown successfully on a Co-catalyzed Si substrate with a TiN buffer layer. The density of CNTs with a dia…
Al-doped ZnO (ZnO:Al) films were grown by repeated sequential precursor reaction cycles (diethylzinc, Zn(C 2 H 5 ) 2 ; Ar purge; H 2 O; Ar purge; trimethylaluminum, Al(CH 3 ) 3 ) with a given pulse ratio of trimethylaluminum (TMA) to diethylzinc (DEZ). As the cycle ratio of TMA to DEZ (TMA/DEZ) increased, the resistiv…
A record peak luminescence intensity of the 5 D 0 → 7 F 4 transition in Eu 3+ ions and broadening of their UV excitation band are obtained by doping of Eu-containing alumina gel films with bismuth oxyfluoride and subsequent thermal treatment at T ≥ 700°C. The results obtained are explained by the formation of complex…
The theoretical possibilities of improving the adhesion between a polypropylene matrix and cellulose natural fibres are well known. However, less is known of how the way of adding MAH‐PP products into the composite impacts the adhesion. By comparing mat processes and granule processes this influence on the adhesive ef…
The interstitial clusters produced by cascades in metals have very high mobility and exhibit thermally activated, one-dimensional glide along ⟨111⟩ directions. Only small interstitial clusters (<4) are observed to change their glide direction during the period of molecular dynamics (MD) simulations (∼10 ns), but the d…
To clarify the effects of the principal factors that govern the thermal fragmentation of a molten metallic fuel jet in the course of fuel-coolant interaction, which is important in evaluating the sequence of core disruptive accidents (CDAs) for metallic fuel fast reactors, basic experiments were carried out using molt…
NO x conversion performance of a urea-selective catalytic reduction (SCR) system comprising V 2 O 5 /TiO 2 catalyst under steady state operating conditions of an 8-litre, common-rail turbo direct injection (TDI) diesel engine was investigated. It was shown that the urea-SCR system achieves 70–90 per cent NO x conversi…
Through‐the‐thickness cracks with the depth of about 2.5 mm were introduced on the flexural specimens of alumina. Borosilicate glass was then penetrated into the cracks at 1500°C to repair them. Strength testing indicated that the cracks, once repaired, became even stronger than mother material alumina. The reason of…
Condensation of 2-hydroxy-3-methoxybenzaldehyde with m-phenylenediamine (1,3-diaminobenzene) (m-pda) gives the ligand [N,N′-bis(2-hydroxy-3-methoxybenzylidene)-1,3-diaminobenzene] which reacts with cupric acetate to give the complex [Cu 2 (L-m-pda) 2 ]·2H 2 O, [L = 2-hydroxy-3- methoxybenzaldehyde)]. The molecular str…
We present Kinetic Monte Carlo simulations based on a simple atomic model of diffusion in alloys under irradiation. The model takes into account the creation of point defects, recombination of close vacancy–interstitial pairs and point defect elimination at sinks. It is applied to simple cases of coupling between radi…