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 local structure of the low-temperature ordered phase of the negative thermal expansion (NTE) material has been investigated by reverse Monte Carlo (RMC) modeling of neutron total scattering data. We obtain, for the first time, quantitative measurements of the extent to which the and polyhedra move as rigid units,…
We report indications of a phase transition in carbonaceous MgB2 above 9 GPa at 300 K after stress relaxation by laser heating. The transition was detected using Raman spectroscopy and X-ray diffraction. The observed changes are consistent with a second-order structural transition involving a doubling of the unit cell…
Exchange anisotropy in ferromagnet/antiferromagnet (FM/AF) films is usually introduced along the cooling field or FM magnetization direction. Here we investigate the dependence of the exchange anisotropy, loop bifurcation, and reversal mechanism on the cooling field direction using vector magnetometry. Three types of…
Doped semiconductors are intrinsically homogeneous media. However, by applying an external magnetic field that has a spatially periodic variation, doped semiconductors can behave extrinsically like conventional photonic crystals. We show this possibility theoretically by calculating the photonic band structures of a d…
We investigated photoluminescence (PL) from reliable and reproducible Sb-doped p-type ZnO films grown on n-Si (100) by molecular-beam epitaxy. Well-resolved PL spectra were obtained from completely dopant-activated samples with hole concentrations above 1.0×1018cm−3. From free electron to acceptor transitions, accepto…
Continuous-wave, time-integrated, and time-resolved photoluminescence experiments are used to study the excitonic optical recombinations in wurtzite $\mathrm{Zn}\mathrm{O}∕{\mathrm{Zn}}_{0.78}{\mathrm{Mg}}_{0.22}\mathrm{O}$ quantum wells of varying widths. By comparing experimental results with a variational calculati…
New hydrophobic, tetradentate nitrogen heterocyclic reagents, 6,6'-bis-(5,6-dialkyl-1,2,4-triazin-3-yl)-2,2'-bipyridines (BTBPs) have been synthesised. These reagents form complexes with lanthanides and crystal structures with 11 different lanthanides have been determined. The majority of the structures show the lanth…
Bring in the substitute! Zn1−xCoxO nanowires are prepared by using a solution-based synthetic route. Structural, optical, and spectroscopic characterizations indicate that the cobalt atoms substitute the zinc cations in the host lattice as a result of the cobalt doping (the picture shows prepared Co-doped ZnO nanowire…
Recently, we demonstrated that PbSe nanocrystal quantum dots can efficiently produce multiple electron-hole pairs (excitons) in response to a single absorbed photon. To address the generality of this carrier-multiplication phenomenon to other materials, we perform a comparative study of multiexciton generation in PbSe…
We report on the discovery of a novel triangular phase regime in the system La1-xSrxMnO3 by means of electron spin resonance and magnetic susceptibility measurements. This phase is characterized by the coexistence of ferromagnetic entities within the globally paramagnetic phase far above the magnetic ordering temperat…
Epitaxial strain can substantially enhance the spontaneous polarizations and Curie temperatures of ferroelectric thin films compared to the corresponding bulk materials. In this Letter we use first principles calculations to calculate the effect of epitaxial strain on the spontaneous polarization of the ferroelectrics…
Polymeric micelles are one of the most refined and promising modalities of macromolecular drug delivery systems , and show unique disposition characteristics in the body suitable for the drug targeting (e.g., prolonged blood circulation and significant tumor accumulation as described in earlier chapter) . Like the oth…
Work materials experience large strains, high strain rates, high temperatures, and complex loading histories in machining. The problem of how to accurately model dynamic material behavior, including the adiabatic effect is essential to understand a hard machining process. Several conventional constitutive models have…
While the principal features of the exchange bias between a ferromagnet and an antiferromagnet are believed to be understood, a quantitative description is still lacking. We show that interface spin disorder is the main reason for the discrepancy of model calculations versus experimental results. Taking into account s…
Thermally poled fused silica glass was characterized with second-harmonic optical and scanning electron microscopy. It was found that, along with the creation of a second-order nonlinearity (SON) layer under the anode surface, a layer of nanometer-sized crystalline particles exists near the anode surface. Its spatial…
In the neutral node ungrounded power system, ferroresonance due to the matching of nonlinear excitation inductance of three-phase PT and network to earth capacitance once happened, has a serious impact on the safety operation of the power system. At present, some widely used prevention measures in practical engineerin…
Detecting, locating and evaluating of partial discharges (PD) in the insulating material, terminations and joints provides the opportunity for a quality control after installation and preventive detection of arising service interruption. A sophisticated evaluation is necessary between PD in several insulating material…
Design considerations of HVDC grounding electrode are discussed in this paper. The main topics covered in this paper are (1) How incorrect soil resistivity measurements lead to design flaws; (2) How different types of grounding electrodes influence the leakage current distribution; (3) How different soil structures in…
The first hydrothermal synthesis of an Al-rich alluaudite-type compound, namely disodium dimanganese aluminium tris(phosphate), which has been obtained at 1073 K and 0.1 GPa starting from the composition Na2Mn2Al(PO4)3, is reported. The crystal structure, which has been refined in the monoclinic C2/c space group, is i…
Abstract Highly monodispersed submicron structures of ZnO were successfully fabricated by a simple ultrasonic cavitational activation, which assists a direct conversion of zinc acetate to ZnO, without using any additives.