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。
Carbothermal reduction of silica is one of the most common methods of producing Si3N4 powders. The experimental conditions have an important influence on the structure of the final product, especially the balance of α- to β- Si3N4. The Sample Controlled Reaction Temperature method describes here has permitted to concl…
We measured the surface electric potential distribution on individual, electrically contacted and biased, multiwall carbon nanotubes using scanning surface potential microscopy. The voltage varies linearly along the nanotube and the voltage drop is directly proportional to the bias applied between electrodes. Its resi…
The pre-edge peak as well as the main peak just above the Fe K-absorption edge is observed for anisotropic tensor of susceptibility (ATS) scattering in magnetite, Fe 3 O 4 (inverse spinel structure). In order to investigate the origin of the peaks, we study the ATS scattering in franklinite, ZnFe 2 O 4 (normal spinel…
A thermomechanically consistent material model representing the multiaxial behavior of shape memory alloys is proposed in this article. The constitutive equations describe the one-way and two-way shape memory effect as well as pseudoelasticity, pseudoplasticity and the transition range between pseudoelasticity and pse…
The cathodoluminescence (CL) properties of Ce-activated strontium thiogallate (SrGa2S4:Ce) thin films have been investigated aiming towards phosphor screen application in an emissive display under low to medium accelerating voltage (<5 kV) excitation. The SrGa2S4:Ce thin films were grown by multisource depositi…
Durch Matrixanregung mit einer Energie, die größer ist als die Bandlücke, können Lanthanoidionen in Wirt-Gast-Systemen sensibilisiert werden (siehe Schema; ET=Energieübertragung, REE=Seltenerd-Emission). Die so verstärkte Lumineszenz der eingeschlossenen Lanthanoidionen führt zu charakteristischen linienförmigen Emiss…
We have measured the spin polarization of Xe (4p)(-1) photoelectrons after ionization with circularly polarized light at photon energies close to the ionization threshold where a resonant enhancement of quadrupole transitions has recently been predicted. At a reaction angle of 90 degrees a nonvanishing longitudinal sp…
Liquid crystals composed of photoactive groups like azobenzene are promising materials for optical switching and image storage applications. When exposed to ultraviolet radiation, such materials are known to induce a transition from a liquid-crystalline nematic phase, in which the azo molecules are in the trans form t…
Fibroin is the main protein component of silk and is expected to have functional applications in bioelectronics and medicine. We investigated nanosecond (ns) pulsed laser ablation of solid fibroin films with/without a dye as a photosensitizer. Laser lights at 248 nm and 532/355/351 nm excited the peptide bond of fibro…
Fission product containment glasses were the first matrices for which long-term behavior studies were undertaken. A substantial body of results has been obtained over the last twenty years, international scientific cooperation programs have been developed, and a strict methodology has progressively been defined to pre…
Long-lasting phosphorescence was observed at 510 nm in a Sn2+–Cu2+ codoped Na2O–CaO–SiO2 glass at room temperature under UV illumination of 254 nm. When the glass was compressed under 3, 6, and 9 GPa, the phosphorescence shifted to 465 nm and its decay rate became shorter. The optical absorption spectra of the samples…
The generation of ammonia from atomic hydrogen and nitrogen has been demonstrated by means of cavity enhanced absorption spectroscopy. The atomic species are produced in a thermal plasma source in which plasma is created from mixtures of hydrogen and nitrogen. It is shown that for large atomic flux conditions, 2% of t…
The potential of nonlinear conductivity spectroscopy for obtaining new information on the hopping dynamics of mobile charge carriers in disordered materials is analyzed from a theoretical as well as from an experimental point of view. The nonlinear conductivity spectra of simple hopping models are calculated by means…
The crystal structure of a rational approximant of an unprecedented dodecagonal quasicrystal is reported. The atomic arrangement of the tantalum-rich telluride Ta(97)Te(60) has been determined from 30 458 symmetrically independent X-ray intensities of a crystal twinned by metric merohedry: a=2767.2(2), b=2767.2(2), c=…
The application of the finite element method to model the deformation of metals at the mesoscale to study the microstructure and texture evolution is described. The finite element discretization is applied directly to the various grains, and crystal plasticity is used as the constitutive basis to model the plastic def…
Shape memory alloys (SMA) show very complicated thermomechanical behavior due to phase transformations and rearrangements, including large bounding hysteretic stress-strain loops as well as their inner loops. In our previous analyses, incorporating the phase interaction energy function (PIEF) as a dissipation potentia…
Effects of Oxygen and Substrate Temperature on Properties of Amorphous Carbon Films Fabricated by Plasma-Assisted Pulsed Laser Deposition Method, Ono, Tomoyuki, Suda, Yoshiyuki, Akazawa, Masamichi, Sakai, Yosuke, Suzuki, Kaoru
Magnetostrictive materials have not changed greatly from their discovery by Joule in 1842 through the 1960's. Their saturation strains remained small and their magnetomechanical couplings were only moderate. The separation of the rare earth elements during World War II and the subsequent measurement of their magnetic…
Carbon nanomaterials were prepared by a new cavity arc jet method under open-air conditions. The cavity arc jet was an electric arc plasma jet spouted from the narrow cavity formed by sandwiching a thin insulator with a partial notch between two graphite electrodes. The soot was obtained by quick cooling of the carbon…
High vacuum electron-beam co-evaporation, followed by N2 annealing at 500 °C is used for preparing of silicon nanocrystals (Si NCs) embedded in Al2O3 dielectric matrix. X-ray diffraction and transmission electron microscopy are used to investigate the structures of Si+Al2O3 films and estimate the mean diameter of the…