Materials Literature
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Amorphous and crystalline Fe-B alloys (5–25 at % B) were studied using pulsed 57Fe nuclear magneticr esonance at 4.2 K. The alloy samples were prepared from a mixture of the 57Fe and 10B isotopes by rapid quenching from the melt. In the microcrystalline Fe-(5–12 at %) B alloys, the resonance frequencies were measured…
Hydrogenated amorphous carbon (a-C:H) coatings have been obtained by means of acetylene decomposition in a non-self-sustained periodic pulse discharge (2A, 50 kHz, 10 μs) with hollow cathode. The discharge operation was maintained by plasma cathode emission with grid stabilization based on dc glow discharge. Using the…
Abstract not Available.
In this study, we have analyzed the mechanism of mixed conduction due to electrons and oxygen ions in (La0.75Sr0.25)MnO3.00 (LSM) and (Ba0.5Sr0.5)(Co0.8Fe0.2)O2.33 (BSCF) by using the Rietveld refinement technique and the maximum entropy method (MEM). Using neutron diffraction measurements, we showed that the site occ…
The crystal structure of a unique type of vesuvianite with the space group P4/n [a = 15.576(2), c = 11.835(2) Å] formed by the retrograde alteration of gehlenite in high-temperature skarn at Kushiro (Tojyo, Shobara Hiroshima) southwestern Japan, is determined by single-crystal X-ray diffraction (R1 = 3.63%). Significa…
Abstract This paper considers main features of the formation of Al–Cu–Fe and Al–Cr–Fe coatings with complex crystalline structures using high-rate electron beam physical vapour deposition (EBPVD). It is shown that the deposition of the coatings at substrate temperatures below approximately 570 K leads to the formation…
Symmetric Taylor impacts of copper and RHA rods were performed using a light gas gun. High-speed photography was used in back illumination to obtain silhouette sequences of the deforming rods. Predictions were then made of the rod profiles using an Armstrong-Zerilli path- dependent model within a Lagrangian finite ele…
The formation of highly imperfect γ-Al 2 O 3 oxide prepared by calcining pseuodoboehmite and plasticized by organic acids was studied. The nature of the organic acid-aluminum hydroxide plasticizer was found to substantially influence the degree of γ-Al 2 O 3 structure imperfection estimated qualitatively as the differ…
The phonon wave packet technique is used in conjunction with the molecular dynamics simulations to directly observe phonon scattering at material interfaces. The phonon transmission coefficient of nanocomposites is examined as a function of the defect size, thin film thickness, orientation of interface to the heat flo…
Monografia sobre la aceria electrica, sus procesos y estudio de los distintos hornos electricos.
Fe-Cr ferritic alloys are applied for interconnects of solid oxide fuel cells (SOFCs) operated at around medium temperatures. The oxidation behavior of sheets with various thicknesses of Fe-22% Cr ferritic alloy, ZMG232L, was investigated. The oxidation rate of thin sheet was much higher than that of thick one because…
Strong circular dichroism is observed in core-level photoelectron transmission through a chirally-etched polycrystalline Au surface, consistent with a chiral dependence on the electron's orbital angular momentum.
The electrochemical oxidation of either open or closed metacyclophanene isomers, which is a positive-photochromic system due to open isomers being more stable than closed ones, quantitatively yields a stable fluorescent dihydropyrene intermediate, a well-known negative T-photochromic system where the closed form is mo…
We study the wetting energetics and wetting hysteresis of sessile and impacting water droplets on superhydrophobic surfaces as a function of surface texture and surface energy. For sessile drops, we find three wetting regimes on these surfaces: equilibrium Cassie at small feature spacing, equilibrium Wenzel at large f…
Shape memory polymers (SMPs) are materials with a great potential for future use in smart materials and structures. When heated from cold state (below the transformation temperature, which can either be the glass transition temperature or the melting temperature of the polymer) to hot state (above the transformation t…
This short review surveys phenomena observed when a magnetic field is applied to a system of localised spins on a lattice. Its focus is on frustrated magnets in dimension d ≥ 2. The interplay of field and entropy is illustrated in the context of their unusual magnetocaloric properties, where field-tuned degeneracies a…
The impact fracture behavior of a vapor grown carbon nanofiber (VGCNF) reinforced high‐density polyethylene (PE) composite was evaluated. The samples consisting of pure PE and composites with 10 wt% and 20 wt% of VGCNFs were prepared by a combination of hot‐pressing and extrusion methods. Extrusion was used to produce…
The adsorption of CO on the Nin cluster surfaces has been systematically investigated by density functional theory. The result indicates that the lowest energy structures of NinCO are generated with CO being adsorbed on Nin clusters, and the lowest energy structures of Nin clusters are not changed by adsorbing CO mole…
To clarify the effects of space environment on mechanical properties of polymer, exposure experiments were conducted utilizing the International Space Station Russian Service Module. Poly‐ether‐ether‐ketone (PEEK) films under tensile stress were exposed to low Earth orbit (LEO) environment, and reference samples were…
In this chapter, we describe Raman microspectrophotometry applied to crystals of biomolecules. Raman spectra collected in crystallo provide structural information highly complementary to X-ray diffraction, relate the crystalline state to the solution state, and allow the identification of ligand-bound or intermediate…