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。
High‐temperature oxidation behavior, microstructural evolution, and oxidation kinetics of additive‐free α‐, β‐, and mixed silicon nitride ceramics is investigated. The oxidation rate of the ceramics depends on the allotropic ratio; best oxidation resistance is achieved for ceramics rich in α‐phase. Variations in the o…
We report an experimental system dedicated for high-resolution and low-temperature photoemission spectroscopy installed on the helical-undulator beamline of a compact 700 MeV electron-storage ring (HiSOR) at Hiroshima University. A 3 m off-plane Eagle normal-incidence monochromator at the beamline covers the photon-en…
Abstract The volume proportions of the mineral phases in two strongly deformed olivine-orthopyroxene rocks have been quantified by whole-pattern stripping of fixed geometry X-ray powder diffraction data. The results were compared with the phase proportions as determined by Rietveld refinement of time-of-flight neutron…
Ge nanocrystals were produced in 4H–SiC by implantation of 250 keV Ge+ ions with a dose of 1×1016 cm−2 and subsequent rapid thermal annealing at 1400–1600 °C. Radiation damage and Ge distribution after implantation and annealing were analyzed by Rutherford backscattering spectrometry, cross-sectional transmission elec…
The extinction coefficient, k ( E ), and refractive index, n ( E ), of zinc meso -tetra porphyrin (ZnP) when incorporated into nanoporous titania were measured in the range 1.7−4.2 eV, by using a method that accounts for both the microstructure and morphology of the semiconductor matrix. Optical and fluorescence spect…
Samples of BaZr 0.95 M 0.05 O 3-α (where M = Al, Er, Ho, Tm, Yb and Y) were prepared by solid state reaction method. The bulk conductivity of the specimens under wet N 2 exposure was studied as a function of temperature, dopant ionic radius and the electronegativity of dopants. The correlation between the conductivity…
Infrared absorption spectroscopy in the multiple internal reflection geometry and hybrid density-functional cluster calculation are used to characterize the adsorption structure of hydride species that form during adsorption of disilane on $\mathrm{Si}(100)(2\ifmmode\times\else\texttimes\fi{}1)$ at room temperature. W…
In the recently developed high-sensitive CaSO 4 : Dy phosphor, sieving before the high-temperature sintering treatment has successfully eliminated particle agglomeration during subsequent sintering, and has further enhanced its thermostimulated luminescence (TSL) sensitivity to γ-rays. The reduction in TSL sensitivity…
Experiments are presented of the response of pseudoelastic NiTi wires subjected to displacement controlled cycles. A custom-built thermo-mechanical testing apparatus is used to control the background temperature field of the wire specimen while allowing the evolution of transformation fronts to be tracked by full-fiel…
We report a quantitative analysis of the detailed equilibrium atomic structure of molten linear polyethylene, obtained using directed bridging Monte Carlo computer simulation techniques. The polydisperse sample has an average chain length of 6000 backbone carbon atoms, or approximately 84000 g mol −1 . This molecular…
The average electronic polarisability of the oxide ion (α O2- ), optical basicity (Λ), Yamashita-Kurosawa's interaction parameter (A) and oxygen Is (O1s) binding energy in x-ray photoelectron spectroscopy (XPS) of xBi 2 O 3 . (100-x)B 2 O 3 glasses (x=0∼65) have been examined to check correlations among them and to cl…
To improve the dimensional properties of wool fabric, two kinds of silicone polymers are applied to plasma pretreated wool. With this treatment, hygral expansion increases slightly but still remains smaller than that of silicone treated wool without the plasma pretreatment. The wrinkle recovery angles of wool increase…
Ti/TiSi2/TiC powder mixtures with molar ratios of 1:1:4 (M1) and 1:1:3 (M2) were first employed for the synthesis of Ti3SiC2 through pulse discharge sintering (PDS) technique in a temperature range of 1100–1325 °C. It was found that Ti3SiC2 phase began to form at the temperature above 1200 °C and its purity did not sh…
Interdependence of the configurational, vibrational, and anharmonic-force contributions to the entropy of a liquid during its supercooling is investigated, and the effect of the anharmonic-force contribution to the entropy at constant pressure and constant volume conditions is analyzed. For realistic values of the Grü…
Thermodynamics of the Na 1−x Li x NbO 3 system is investigated by high‐temperature drop‐solution calorimetry in molten 3Na 2 O–4MoO 3 solvent at 973 K. Standard molar enthalpies of formation are derived. The estimated heats of transition between hypothetical and stable structures, lithium niobate and perovskite for Na…
A microscopic model is developed for calculating electrostatic properties of nanotube devices. It is shown that the quantum-mechanical approach yields the same results as the statistical calculation in the limit of a thin tube suspended over a conducting gate at a distance exceeding the nanotube radius. A closed analy…
We present the results of molecular dynamics computer simulations of a simple glass former close to an interface between the liquid and the frozen amorphous phase of the same material. By investigating F s (q, z, t), the incoherent intermediate scattering function for particles that have a distance z from the wall, we…
The induction period of urea in methanol has been measured experimentally by the visual observation method. The induction period, which is inversely proportional to the nucleation rate, has been used to estimate the interfacial tension between the urea crystal and the methanol solution and hence the nucleation paramet…
Abstract The oxygen (O2) absorption kinetics of six commercial O2 scavengers were studied. The scavengers were placed in bags which were filled with 240 mL of air, 4.5 L N2 + 15 mL of air, or 3.5 L CO2 + 9 mL of air. The O2 concentration in each bag was measured at hourly intervals for 8 h. The effects of variability…
High quality piezoelectric single crystals, such as Pb(Zn(1/3)Nb(2/3))O3-PbTiO3 (PZNT) and Pb(Mg(1/3)Nb(2/3))O3-PbTiO3 (PMNT), have been investigated, and, because their piezoelectric properties are greatly superior to those of Pb(Zr(1-x)Ti(x))O3 (PZT) ceramics, they have been used for certain transducer applications…