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 crystallized amorphous Pr/sub 12/Fe/sub 83/B/sub 5/ flakes by conventional and pulse annealings with various heating rates, and studied the effects of the heating rate on the magnetic and structural properties of the achieved nanocomposite PrFeB//spl alpha/-Fe magnets. An increase in the heating rate beyond 850 K/m…
Abstract Polymer materials are often mixed with inorganic materials in the bulk to enhance properties, including mechanical, electrical, thermal, and physical. Such property enhancements are induced not only by the physical presence of the filler but also significantly by the interaction of the polymer with the filler…
Textured nanocrystalline Nd/sub 14/Fe/sub 80/B/sub 6/ and Nd/sub 12/Dy/sub 2/Fe/sub 73.2/Co/sub 6.6/Ga/sub 0.6/Br/sub 5.6/ magnets were produced from melt-spun materials by hot pressing and die-upsetting. Isotropic hot-pressed precursors with various grain sizes obtained by additional annealing were also prepared for…
Aftereffect - that is, decay of magnetization with time at a fixed holding field - is often linear in log-time for a limited time window. The slope of the decay at the holding field that maximizes the decay rate (normally near the field that maximizes the irreversible susceptibility) is often used as a measurement of…
A magnetic model has been developed which provides a self-consistent description of the effects of stress on hysteresis loop and Barkhausen effect (BE) signals. The BE signal was calculated based on the hysteretic-stochastic process model of domain wall dynamics, which has been extended to include the magnetomechanica…
The absorption and emission spectra and the rate parameters for the important energy-exchange processes relevant to the 4I11/2 → 4I13/2 laser transition in Er3+-doped and Er3+,Pr3+-codoped GeGaS glasses are presented. The rate parameters are determined after optical excitation with a tunable pulsed optical parametric…
The microstructural changes during the hydrogenation disproportionation desorption recombination process have been characterized step by step. The magnetic properties and the degree of texture have been determined when varying the hydrogen pressure and a strong correlation was found: low hydrogen pressure during dispr…
In order to incorporate magnetostrictive actuators into microelectromechanical systems devices, thin film magnetoelastic materials must have both a high magnetostriction and a low saturation field. This work focuses on the fabrication and characterization of [110] oriented epitaxial FeGa thin films grown epitaxially o…
The first-reported Cu-based icosahedral quasicrystal has been found as an almost single phase in Cu 48 Ga 34 Mg 3 Sc 15 alloy annealed at 1043K for 61h. On the basis of our experiments, this icosahedral quasicrystal is expected to be one of the equilibrium phases in this alloy system. Powder X-ray diffraction and elec…
Mechanisms for the collapse and absorption of truncated stacking-fault tetrahedra (SFTs) by approaching dislocations are proposed. Both self-energy and elastic interaction energy in a straight dislocation-SFT system are calculated analytically. Although an isolated perfect or truncated SFT is in many cases more stable…
A high-G+C gram-positive, motile, non-spore-forming coccus capable of accumulating significant amounts of polyhydroxyalkanoate (PHA) was isolated from an inefficient biological phosphorus removal activated sludge reactor. The cell wall of strain Lpha5T was characterized by the presence of meso-diaminopimelic acid, men…
The arrays of NiFe and CoNiFe nanowires were grown in anodic alumina (alumite) and track etched polycarbonate (PCTE) membranes with various pore sizes by pulsed electrodeposition. Magnetic properties of the array were studied as functions of wire material, length, and diameter as well as field orientation. In PCTE mem…
Summary The uptake of iodine species (I − /IO 3 − ) by HCP (hardened cement paste) and a CSH (calcium silicate hydrate) phase under highly alkaline conditions has been investigated using X-ray absorption spectroscopy (XAS). The study was performed at the I K-edge (33.169 keV) instead of the I L 3 -edge (4.557 keV) to…
Polycrystalline Mn–Zn ferrites substituted with different rare earth ions (R = La, Nd, Sm, Gd and Dy) are investigated. X-ray diffraction analysis showed a single spinel phase. On substitution, the lattice parameter remained unchanged, the porosity is increased and the grain size is decreased relative to the unsubstit…
Silicon oxycarbide (SiOC) ceramic foams, obtained from the pyrolysis of a preceramic polymer, were subjected to thermal multiple cycles from 800°–1200°C to room temperature in a water bath. Flexural and compression strengths, as well as elastic modulus, were characterized before and after quenching. Excellent thermal…
Self‐propagating high‐temperature synthesis is a very easy and low‐cost method to synthesize Si 3 N 4 . The nitriding of silicon powder takes place in a self‐sustained regime under high pressures of nitrogen with dilution of silicon by Si 3 N 4 . In this work effects of dilution and green‐mixture porosity on combustio…
Phase transition and dielectric properties of La-doped Pb(Zr,Sn,Ti)O3 antiferroelectric ceramics under hydrostatic pressure and temperature have been studied, and effects of temperature on the pressure-induced phase transition and the dielectric property dependence on the applied hydrostatic pressure have been investi…
Ba2CoBO6 (B = Mo, W) perovskites have been prepared in polycrystalline form by thermal treatment, in air, of previously decomposed citrate precursors. These materials have been characterized by X-ray (XRD) and neutron powder diffraction (NPD) data and magnetization measurements. At room temperature, the crystal struct…
Abstract The objective of this work was to obtained stable nanocapsules (NC), that is to say a core shell structure by a recently patented method, the emulsion diffusion of solvent. To study the capacity of encapsulation, the aim was first to control the nanocapsules size distribution before the characterization of th…
We have measured the dielectric relaxation of neat cis/trans-decahydro-naphthalene (decalin) in its supercooled regime as a function of temperature. The fragility of this nonaromatic molecular glass former is extremely high, m=147, and the distribution of relaxation times in terms of the stretching exponent is accordi…