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。
The capacity of hydrogen storage in alkali metal (Li, Na, or K), alkaline-earth metal (Be, Mg, or Ca), or Ti decorated borazine has been investigated by using the first-principles calculations based on density functional theory. Our results indicated that alkali metals could bind strongly to the inorganic molecule bor…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTNucleation of Polymer Crystals: The "δ Mystery"Yi-Kang Lan and An-Chung Su*View Author Information Department of Chemical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan*To whom correspondence should be addressed.C…
We present the results of vibrational and thermal properties for small diameter silicon nanowires (Si-NWs) from first principles calculations. Phonon spectrums of the Si-NWs are obtained based on the density functional perturbation theory. We found that heat-carrying acoustic branches exhibit “bending,” which results…
The effect of electric field on the dielectric properties of high-k Ba(Fe1/2Nb1/2)O3 ceramics with different grain sizes is reported. A low frequency giant dielectric tunability (>85%) can be obtained under a bias field as low as 50 V/mm. The results suggest that the giant dielectric tunability originates from…
In the present work, a microwave excited plasma (2·45 GHz, 1 kW) was used to modify the surface characteristics of the ethylene propylene diene monomer rubber. The samples were treated with a mixture of nitrogen, hydrogen and argon plasmas. The operating gas pressure was in the 0·2–1 Torr range, the gas flowrate betwe…
Co x C 1 − x granular films and pure carbon films were deposited on n-type Si substrates using the pulsed laser deposition method. Three types of samples were obtained: pure C/Si, CoxC1−x granular film/Si with Co dispersed in the C film, and CoxC1−x/Si with Co segregated at the interface. After comparing the physi…
Quantum transport properties in fractal magnetically modulated structures are studied by the transfer-matrix method. It is found that the transmission spectra depend sensitively not only on the incident energy and the direction of the wave vector but also on the stage of the fractal structures. Resonance splitting, en…
Spinel ferrite flakes Ni0.97−xZnxCo0.03Fe2O4 with x=0.5 and 0.65 are prepared for use as fillers in electromagnetic composites. The composites with the flaky fillers exhibit greatly enhanced high-frequency and attenuation properties. The complex permeability, μ0′ and μmax″, is enhanced by about 500%–700%, and the rela…
Recently a simple recipe has been developed to prepare Ag nanoparticles in a TiO2 matrix {Okumu et al., [J. Appl. Phys. 97, 094305 (2005)] and Dahmen et al., [Appl. Phys. Lett. 88, 011923 (2006)]}. In this scheme, silver nanoparticles are formed in a TiO2 matrix by sputtering a thin silver film sandwiched between TiO2…
Poren mit Tiefenprofil: Nanoporöse Membranen aus anodischem Aluminiumoxid lassen sich in Form mehrerer Schichten mit unterschiedlich funktionalisierten Oberflächen aufbauen (siehe Schema). So hergestellte Membranen sind chemisch wie mechanisch robust und selektiv beim Transport kleiner Moleküle.
The magnetostriction curve of [110]-oriented Tb0.3Dy0.7Fe1.9 crystal is measured under different compressive prestress. It is observed that the saturation magnetostriction keeps on increasing with the increase in compressive prestress from 0 to 75 MPa. The distribution of the free energy within the (110) plane normal…
Semiconductor nanotubes, including carbon nanotubes, have vast potential for new technology development. The fundamental physics and growth kinetics of these nanotubes are still obscured. Various models developed to elucidate the growth suffer from limited applicability. An in-depth investigation of the fundamentals o…
The effect of surface termination on C $1s$ core-level bulk excitons found near the surface in single-crystal diamond is reported. By simultaneously recording bulk (total electron yield) and surface (partial electron yield) near-edge x-ray absorption fine-structure (NEXAFS) spectra with a range of single-crystal surfa…
Doping of semiconductor nanocrystals is an important problem in materials research. Using infrared and x-ray photoelectron spectroscopy, we have observed Cu acceptor dopants that were intentionally introduced into ZnO nanocrystals during growth. The incorporation of Cu2+ dopants increased as the average diameter of th…
The first order austenite to martensitic transition in the off-stoichiometric Heusler alloy Ni–Co–Mn–Sb has been studied using magnetization, electrical resistivity, and heat capacity measurements with different field cooling protocols and thermal cyclings. The coexistence of high temperature, high magnetic austenite…
Magnetic and structural properties of nanocrystalline low-doped La0.8Ca0.2CoO3 cobaltites with particle size of 8, 13, 23, and 50 nm, prepared by the glycine-nitrate method, were investigated in temperature range 5–320 K, magnetic field up to 50 kOe and under hydrostatic pressure up to 10 kbar. With particle downsizin…
The effects of electron interaction on the magnetoconductance of graphene nanoribbons (GNRs) are studied within the Hartree approximation. We find that a perpendicular magnetic field leads to a suppression instead of an expected improvement of the quantization. This suppression is traced back to interaction-induced mo…
Magnetic properties of electron-doped La1/3Ca2/3MnO3 manganite nanoparticles with average particle size ranging from 12 to 42 nm, prepared by the glycine-nitrate method, have been investigated in temperature range 5–300 K and in magnetic fields up to 90 kOe. Reduction in the particle size suppresses antiferromagnetism…
Earlier studies have shown that pure quantum mechanical effects on the "light" methyl radical at low temperature minimize the anisotropy of CW EPR spectra to a high resolution character, and new experiments under different conditions display a small additional electron paramagnetic resonance (EPR) line-shape anisotrop…
Migration of {112} incoherent twin boundary (ITB) in nanotwinned Cu under electric current stressing has been observed using in situ high-resolution transmission electron microscopy. The current-driven ITB migration is found to be four orders of magnitude faster than that driven thermally. We propose that electric cur…