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。
We have investigated the resistivity of an organic Mott insulator, β'-(BEDT-TTF) 2 AuCl 2 , under extremely high pressures of up to 9.9 GPa, using the cubic anvil press, motivated by the fact that a related material, β'-(BEDT-TTF) 2 ICl 2 , shows the highest transition-temperature superconductivity among organics at 8…
The magnetoelectric effect in millimeter size PMN-PT∕Terfenol-D composites is known. In an effort towards miniaturization, we report on the magnetoelectric effect in micrometer-size sputtered composites. Multilayers of TbFe∕FeCo with a thickness of 4μm were sputter deposited on both sides of PMN-PT piezoelectric singl…
Microscopy experiments are employed to characterize the elastic interactions of magnetic nickel nanowires suspended in a nematic liquid crystal. The nematic imposes a torque on an isolated wire that increases linearly with the angle between the wire and the nematic director in a manner quantitatively consistent with p…
Nanowires of the Fe–Ga alloy system, Fe1−xGax (0.1⩽x⩽0.25at.%), were fabricated using electrochemical deposition into nanoporous anodic alumina. Fe–Ga alloys are magnetically soft, mechanically robust, ductile, and have large magnetostriction. High aspect ratio nanowires with varying diameters and lengths were fabrica…
Monodispersed Fe–Pt nanoparticles are promising candidates for biomedical applications with an average particle diameter of 6.9nmFe48Pt52, 3.3nmFe52Pt48, and 4.2nmFe70Pt30. They are prepared by simultaneous chemical reduction of Pt(acac)2 and thermal decomposition of Fe(CO)5 in the presence of surfactant as an anti-ox…
In the drying process of paste, we can imprint into the paste the order how it should be broken in the future. That is, if we vibrate the paste before it is dried, it remembers the direction of the initial external vibration, and the morphology of resultant crack patterns is determined solely by the memory of the dire…
We examine the Lindemann melting law at different pressures using the vibrational density of states (DOS), equilibrium melting curve, and Lindemann parameter delta(L) (fractional root-mean-squared displacement, rmsd, at equilibrium melting) calculated independently from molecular dynamics simulations of the Lennard-Jo…
We numerically investigate the electromagnetic field radiated by a line source within a perfect lens [Phys. Rev. Lett. 85, 3966 (2000)] consisting of two orthogonal planes delimiting positive and negative index media. Use of a coordinate transformation [J. Phys. Condens Matter 15, 6345 (2003)] together with a well-ada…
Raman spectra of TeO2-based glasses doped with WO3, ZnO, GeO2, TiO2, MoO3, and Sb2O3 are measured. The intensity of bands in the Raman spectra of MoO3-TeO2 and MoO3-WO3-TeO2 glasses is shown to be 80-95 times higher than that for silica glass. It is shown that these glasses can be considered as one of the most promisi…
This project investigates the behavior of iron–gallium (Galfenol) alloys in elastic bending to facilitate the design concepts for using Galfenol in novel sensor applications at the macro to nanoscale. A series of experiments are conducted on the magnetic response of cantilevered beams to dynamic bending loads. The sam…
We report on the first observation of magnetoelectric X-ray scattering (MEXS), i.e., incident- k -direction-dependent scattering, for a polar ferrimagnet GaFeO 3 . Near the K edge of Fe, the magnetic component of the (040) X-ray reflection shows a larger enhancement than that of the (020) X-ray reflection, which canno…
By means of annealing LaBaCo 2 O 5 under high pressure oxygen, we have successfully synthesized a new A-site ordered perovskite cobaltite, LaBaCo 2 O 6 . The structure and electromagnetic properties of LaBaCo 2 O 6 have been investigated and compared to those of the ordinary A-site disordered La 0.5 Ba 0.5 CoO 3 . Bot…
Water-based ferrofluids of substituted ferrites Fe1−xMnxFe2O4 (0⩽x⩽1) have been prepared by the co-precipitation method and characterized. Particles are superparamagnetic with an average particle size of about 10–12nm. The specific absorption rate (SAR) was measured by calorimetric measurement at a frequency of 300kHz…
Using single-crystal organic field-effect transistors with the conduction channel exposed to environmental agents we have observed generation of electronic defects at the organic surface in the high-vacuum environment. Rapid decrease of the source-drain current of an operating device is observed upon exposure of the c…
We report on a promising approach to the artificial modification of ferromagnetic properties in (Ga,Mn)As using a Ga$^+$ focused ion beam (FIB) technique. The ferromagnetic properties of (Ga,Mn)As such as magnetic anisotropy and Curie temperature can be controlled using Ga$^+$ ion irradiation, originating from a chang…
International audience
Using a density functional method with explicit account for strong Coulomb repulsion within the 4f shell, we calculate effective exchange parameters and the corresponding ordering temperatures of the (ferro)magnetic insulating Eu monochalcogenides (EuX; X=O,S,Se,Te) at ambient and elevated pressure conditions. Our res…
Abstract The activity for methanol oxidation of Pt3Ru2Sn/C was significantly higher than that of Pt/C or PtRu/C catalyst by improving CO tolerance. The higher CO tolerance property of Pt3Ru2Sn/C was caused by the synergic effects of Ru as a water activator and Sn as an electronic modifier of Pt. In ternary alloy catal…
A detailed analysis of a metallosupramolecular polyelectrolyte-amphiphile complex (PAC) at the air-water interface is presented. Langmuir isotherms, Brewster angle microscopy, and X-ray reflectance and diffraction methods are employed to investigate the structure of the Langmuir monolayers. The PAC is self-assembled f…
As a potential candidate for hydrogen storage, Li 3 N can absorb more than 9 wt % hydrogen. However, because of its incomplete dehydrogenation at a temperature of 280 °C, only about 5.5 wt % reversible hydrogen capacity could be reached. Although by increasing the temperature one can enhance dehydrogenation, this pape…