Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Oxalate in soils may enhance phosphate availability, promote mineral dissolution, and increase the mobility of aluminium and heavy metal cations by complexation. Rhubarb (Rheum rhaponticum L.) has very high content of oxalate in leaves and petioles, and therefore the topsoil under rhubarb might have elevated contents…
The mechanism of new grain evolution during equal channel angular extrusion (ECAE) up to a total strain of ~12 in an Al-Cu-Mn-Zr alloy at a temperature of 475oC (0.75Tm) was examined. It was shown that the new grains with an average size of about 15 µm result from a specific process of geometric dynamic recrystallizat…
V6O13 with a metal–insulator transition at Tc 150 K and an antiferromagnetic order at TN 50 K has a ddyz-type single trellis layer and a dxy-type double trellis layer, where x and y correspond to the a- and b-axis, respectively. Magnetic properties above Tc are consistent with theoretical results for a one-dimensional…
The mechanisms of grain refinement during severe plastic deformation have been studied, by comparing the microstructure evolution in an AA2219 aluminium alloy, containing Al3Zr nanoscale particles, with that in a dilute Al-3%Cu alloy deformed identically by equalchannel angular extrusion (ECAE) at 250oC to a maximum s…
Hydrostatic pressure effects on the structural and magnetic properties were investigated for two potassium–cobalt-iron hexacyanides, K 0.12 Co[Fe(CN) 6 ] 0.70 ·4.87H 2 O (high [Fe(CN) 6 ] vacancy concentration v ) and K 0.36 Co[Fe(CN) 6 ] 0.82 ·4.56H 2 O (low- v ). In both the compounds, we observed a pressure-induced…
Duplex stainless steels 2205 are widely used in constructional and petrochemical applications because of their good mechanical and corrosion properties. The objective of this work was to study the influence of aging at high temperature on the austenite and d ferrite equilibrium. After welding by TIG process, duplex st…
Texture formation through strain induced boundary migration (SIBM) was investigated. Temper rolling reduction before final annealing for SIBM was varied between 0 and 26% and grain sizes and textures were measured using EBSD. In the specimen which was temper rolled to 5%, in which grain growth by SIBM occurred most ef…
The microstructure and crystallographic texture in zirconium (Zr702) sheets, initially deformed by 80% cold rolling, are investigated at different stages of the primary recrystallization. Inhomogeneities were observed in the deformed microstructure at different scales down to the submicrometer range. The influence of…
In this paper we report studies of the charge stripe ordering using high resolution x-ray scattering in the nickelate system ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Ni}{\mathrm{O}}_{4}$ with doping levels of $x=0.33$, $x=0.30$, and $x=0.275$. The charge stripes for all doping levels were found to be…
Carbon tubules are used to assemble Co 3 C or Co particles from an agglomerate into a straight line. The walls of the carbon tubules are grown by the slow catalytic decomposition of a fluorocarbon at 375 °C over the Co 3 C or Co particles. The nanoparticles then merge via oriented attachment to form nanowires. Dependi…
A new series of aza-substituted analogues 3-5 based on the 1,4-bis(phenylethynyl)benzene moiety have been synthesized by the selective Pd-catalyzed Sonogashira coupling reaction from 5-bromo-2-iodopyrimidine (1). In these linear molecules, the dipolar pyrimidine moiety is introduced as a probe to investigate factors t…
An adaptive lens, which has variable focus and is rapidly controllable with simple low-power electronics, has numerous applications in optical telecommunications devices, 3D display systems, miniature cameras and adaptive optics. The University of Durham is developing a range of adaptive liquid crystal lenses, and her…
Dynamics of charge density and lattice displacements after the neutral phase is photoexcited is studied by solving the time-dependent Schr\"odinger equation for a one-dimensional extended Peierls-Hubbard model with alternating potentials. In contrast to the ionic-to-neutral transition studied previously, the neutral-t…
Deoxyribonucleic acid (DNA), extracted from salmon sperm through an enzyme isolation process, is a by-product of Japan’s fishing industry. To make DNA a suitable material for nonlinear optic (NLO) applications, it is precipitated with a surfactant complex, hexadecyltrimethlammonium chloride (CTMA). Preliminary charact…
3-Dimensional X-Ray Diffraction (3DXRD) microscopy is a tool for fast and non-destructive characterization of the individual grains, sub-grains and domains inside bulk materials. The method is based on diffraction with highly penetrating hard x-rays, enabling 3D studies of millimeter - centimeter thick specimens. The…
In the present study, we investigate H 2 desorption from a magnesium hydride MgH 2 cluster by performing total energy calculations based on the density functional theory (DFT). We calculate the potential energy surface (PES) for the H 2 desorption from a (MgH 2 ) 5 cluster. According to the total atomic charges of the…
Abstract The melt crystallization behaviors and crystalline structures of poly(ethylene terephthalate) (PET), poly(trimethylene terephthalate), and poly(ethylene‐ co ‐trimethylene terephthalate) (PETT) were investigated with differential scanning calorimetry (DSC), polarized optical microscopy (POM), and X‐ray diffrac…
In this work we demonstrate that carbon nanotube junctions with an optional number, type (zigzag and/or armchair) and diameter of tubes can exist. We show a method for geometric construction of their models.
Two new organically templated borogermanates, [H 2 DACH][Ge 3 B 2 O 9 (OH) 2 ] ( 1 ) (DACH = trans -1,4-diaminocyclohexane) and [H 2 BAPPZ][Ge 3 B 2 O 9 (OH) 2 ]·1.5H 2 O ( 2 ) (BAPPZ = trans -1,4-bis(3-aminopropyl)piperazine), have been synthesized under mild hydrothermal conditions in the presence of DACH and BAPPZ…
We present a first-principles investigation of the structural properties, electronic structure, and the chemical stability of the complex hydrides $\mathrm{Na}\mathrm{Al}{\mathrm{H}}_{4}$ and ${\mathrm{Na}}_{3}\mathrm{Al}{\mathrm{H}}_{6}$. The calculations are performed within the density functional framework employin…