Materials Literature
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Elastic constants and bulk modulus for the tetragonal, rhombohedral, and cubic phase of Na0.5Bi0.5TiO3 crystal were calculated from the first principles. From the calculated elastic constants, other structural properties such as bulk modulus, shear modulus, Young's modulus, and Poisson's ratio can be derived using res…
In the present work, the effects of milling and calcination temperature on the compressibility and sinterability of a nanocrystalline Al 2 O 3 –Y 3 Al 5 O 12 composite powder prepared by an aqueous sol–gel method were investigated. The results showed that calcination temperature has a strong influence on the sinterabi…
The goal of this study was to determine whether it was possible to avoid the formation of cobalt silicate during the preparation of silica-supported Co catalysts since this too-stable cobalt phase is detrimental to catalyst activity. The strategy was to use the strong chelating ligand ethanediamine (en) to complex Co…
This paper proposes a new perspective on the analysis of fabric structures – the concept that material testing and computational mechanics are mutually dependent and, by implication, not to be considered as independent. Current representations of fabric stress-strain behaviour are based on plane-stress assumptions, an…
The migration behaviour of polymer additives in 17 polypropylene (PP) samples is described. These samples cover the major types of PP used in food packaging. The diffusion coefficients of additives with relatively small molecular masses, M(r) = 136 (limonene), as well as the migration of typical antioxidants used in P…
Abstract Summary: Semi crystalline and amorphous poly(lactic acid) (PLA) thin films exhibit different glass transition temperature and behaviour, as revealed by ellipsometry. For semi‐crystalline poly(L‐lactic acid) (PLLA) thin film (with crystalline content between 40 and 60%), the glass transition temperature (T g )…
A high-density vertically well-aligned ZnO nanoneedle array was fabricated on a ZnO-buffer film on silicon substrates by metal-organic chemical vapor deposition at a growth temperature of 480–500°C. Highly crystalline ZnO nanoneedle arrays showed a strong near-bandedge emission at 380nm in room-temperature photolumine…
Single-phase zinc aluminate (ZnAl2O4) with the spinel structure was successfully obtained by the Pechini method at different calcining temperatures for 4 hours. The nanoparticles are highly crystalline with no impurities related to ZnO or Al2O3 residues. The microstructural environment of aluminium ions changes with h…
A new genus and species in the Thalassiosiraceae, Thalassiosirales is described from Fontana Lake, a reservoir in the Tennessee River drainage, North Carolina, which makes up much of the southern boundary of Great Smoky Mountains National Park. The newly described taxon, Spicaticribra kingstonii, most closely resemble…
Multilayered ZnO films were deposited by rf magnetron sputtering on silicon and sapphire substrates. The aim of this work is to improve structural quality of ZnO thin films grown on just listed substrates. Presented X-ray diffraction data testify to remarkable relaxation of compressive stress in twoand three-layered Z…
We investigated structural and magnetic properties of CoMnSi (CMS) Heusler alloy films and giant magneto-resistance (GMR) ratio of current-perpendicular-to-plane (CPP) GMR sensor elements. The films were deposited with magnetron sputtering method and annealed at 673 K and 773 K. The CMS films were identified as B2 str…
Xocolatlite, Ca 2 Mn 4+ 2 Te 6+ 2 O 12 ·H 2 O, is a rare new mineral from the Moctezuma deposit in Sonora, Mexico. It occurs as chocolate-brown crystalline crusts on a quartz matrix. Xocolatlite has a copperbrown streak, vitreous luster, and is transparent. Individual crystals show a micaceous habit. Refractive indice…
The correlation between magnetoacoustic emission intensity and mechanical Barkhausen effect intensity has been tested in the case of P91 steel having different microstructure states due to either plastic flow at room temperature or speeded-up creep, performed under stress 290 MPa at temperature 773 K. The plastic stra…
Exfoliated Nylon 66/organoclay (PA66/OMT) nanocomposites were synthesized based on adipic acid, hexamethylendiamine, and organoclay (organically modified montmorillonite, OMT) modified by protonated aminocaproic acid via in situ polymerization. X-ray diffraction and transmission electronic microscopy were used to char…
Based on the microwave absorption properties and the micro-current attenuation mechanism for the cage-like ZnO/SiO2 nanocomposite reported in our previous paper, we established a micro-current attenuation model and the associated quantitative formula for the calculation of microwave absorption properties. Very good co…
We study the mobilities of point-like and extended objects (rods) on a spherical membrane to show how these quantities are modified in a striking manner by the curvature and topology of the membrane. We also present theoretical calculations and experimental measurements of the membrane fluid velocity field around a mo…
The microstructure of AA2024 T351 was characterised by light and scanning electron microscopy combined with energy dispersive X-ray spectrometry. Mainly three types of intermetallics (θ phase, S phase and an Al–Fe–Si–Mn–Cu phase) were identified. The anodic oxide formation on AA2024 was studied by electrochemical meas…
We report on calculations of the anisotropic magnetocaloric effect in DyAl2 using a model Hamiltonian including crystalline electrical field effects. The anisotropic effect is produced by the rotation of a constant magnetic field from the easy to a hard magnetic direction in the crystal and is enhanced by the first or…
The preparation of carbon nanowalls (CNWs) by hot-wire chemical vapor deposition (HWCVD) and the effects of substrate heating temperature T h and filament temperature T f in this method have been investigated. The CNWs can be prepared by HWCVD using CH 4 without H 2 dilution. The wall size obtained from the scanning e…
A diopside composition silicate glass containing 8 wt% Fe 2 O 3 was prepared from melt equilibrated at 1500 °C and different redox conditions in the range logf O₂ = -0.7 (air) to logf O₂ = -6. The Fe 2+ /Fe T was measured using Mössbauer spectroscopy. The Mössbauer data were used to calibrate Raman-scattering intensit…