Materials Literature
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Using density functional theory with the generalized gradient approximation, we have studied the interaction between a single Pt atom and a carbon nanotube. The bridge adsorption site on the outer wall of nanotube is favorable. The curvature affects the binding strength. Compared to the larger nanotube, Pt could bind…
The effects of hBN content on microstructure, mechanical properties, and machinability of the pressureless-sintered Si3N4 ceramics were investigated. Flexural strength, Young’s modulus, and hardness decreased with increasing h-BN content. The mechanical properties are decreased mainly because of increased porosity of…
A single crystal of commercially available `iron(III) perchlorate hexahydrate' has been structurally characterized and shown to be hexaaquairon(III) tris(perchlorate) trihydrate, [Fe(H 2 O) 6 ](ClO 4 ) 3 ·3H 2 O. The structure contains [Fe(H 2 O) 6 ] 3+ complex ions, charge-balancing perchlorate ions and three water m…
As the result of combustion reaction in Al-Al2O3-N2 system, AlON phase can be synthesized in the range of initial nitrogen pressure, from 1 to 5 MPa. On the occasion of rm = 0.3, the unreacted Al was detected in the case of 1 MPa of PN2. Its intensity decreases with an increase of nitrogen pressure. Ultimately, no pea…
We report on the stress response of gyroidal and lamellar amphiphilic mesophases to steady shear simulated using a bottom-up lattice-Boltzmann model for amphiphilic fluids and sliding periodic (Lees-Edwards) boundary conditions. We study the gyroid per se (above the sponge-gyroid transition, of high crystallinity) and…
Foamed metal is a kind of porous material with pores in the metal matrix. One of the possible process routes is to blow gas bubbles into liquid metals. However, many metallic foams produced by this foaming method have coarse and irregular cell structures. The industrial aim is to fabricate foams with more uniform stru…
The structural, magnetic, and transport properties of Co-doped ${\mathrm{Sr}}_{2}{\mathrm{FeMoO}}_{6}$ in a series of nominal composition ${\mathrm{Sr}}_{2}{\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}{\mathrm{MoO}}_{6}$ $(x=0$, 0.05, 0.1, 0.2, 0.4, 0.7, and 0.9) are studied. At room temperature, the crystal struc…
FRP (fiber-reinforced polymer) ships used with small boats for fishing pose numerous problems related to both the environment and recycling. From this perspective, aluminum offers an environmentally friendly substitute for FRP that is easy to recycle and imparts a high added value to fishing boats, with a reduction in…
The crystal structure and order-disorder transition of Cr2N were investigated utilizing transmission electron microscopy (TEM). Based on the analyses of selected-area diffraction (SAD) patterns, the crystal structure of the ordered Cr2N superstructure was confirmed to be trigonal (P31m), characterized by three sets of…
The possibility of a ferromagnetic semiconductor single-wall carbon nanotube (SWCNT), where ferromagnetism is due to coupling between a doped magnetic impurity on a zigzag SWCNT and electron spin, is investigated. We found in the weak impurity–spin couplings, at low impurity concentrations, the spin up electron densit…
We have investigated the local structure around the Mn atom on highly diluted manganites with formal ${\mathrm{Mn}}^{3+}$ and ${\mathrm{Mn}}^{3.5+}$ ions by x-ray absorption fluorescence spectra. Both x-ray absorption near-edge structure and extended x-ray absorption fine structure were recorded for $\mathrm{La}{\math…
With a view to investigate the effect of small size of A-site cations on the magnetic properties of the rare earth cobaltates, Ln {sub 1-} {sub x}A{sub x} CoO{sub 3} (Ln=rare earth, A=alkaline earth), we have investigated Pr{sub 0.7}Ca{sub 0.3}CoO{sub 3} and Nd{sub 0.7}Ca{sub 0.3}CoO{sub 3} in detail. For this purpose…
A fracture criterion for rigid polyurethane foam is developed based on idealization of constituent cells by elongated tetrakaidecahedra. The ability of the proposed geometrical model to mimic the fracture characteristics of actual rigid polyurethane foam is examined and a fracture criterion derived analytically. In ta…
Abstract An understanding of the limiting stress level for crack initiation and propagation in a fuel cladding material is a fundamental requirement for the development of water reactor clad materials. Conventional tests, in use to evaluate fracture properties, are of limited help, because they are adapted from ASTM s…
In phase-change technology small volumes of a chalcogenide material are switched between amorphous and crystalline states by local heating with a short laser or current pulses. AgInSbTe is an alloy frequently used in optical data storage, which could also be applied in electronic data storage. For those applications i…
We report the observation of persistent photoconductivity (PPC) effect in 2H-MoSe2 layered semiconductors. The decay behavior of PPC can be well described by a stretch-exponential function. Experimental results indicate that the lattice relaxation of DX-like impurity is responsible for PPC in MoSe2. In addition, the s…
The growth and formation of Ge nanocrystals embedded into a silicon oxide (SiO 2 ) system synthesized by furnace annealing have been studied based on the Ge content of co-sputtered Ge–SiO 2 films. The influence of a silicon oxide diffusion barrier inserted between the co-sputtered film and the substrate on the formati…
We introduce and discuss an interpretative model of the structure and bonding of inorganic crystals containing metallic elements. The central idea is the conception of the crystal structure of such an inorganic compound as a metallic matrix whose geometric and electronic structures govern the formation and localizatio…
[structure: see text] Without employing protection and deprotection processes, two series of triazine-based dendrons were efficiently prepared by a convergent method and fully characterized; their physical properties, including acidic, thermal, electrical, and optical stabilities were also studied.
Efficient field electron emission from ZnO nanoparticles synthesized by a chemical route has been observed. Nanostructures were synthesized in three different morphologies, namely needles, rods, and spheres. The field emission studies carried out in diode configuration show that the onset fields required to draw a cur…