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。
Abstract Amorphous calcium carbonate (ACC) in its pure form is highly unstable, yet some organisms produce stable ACC, and cases are known in which ACC functions as a transient precursor of more stable crystalline aragonite or calcite. Studies of biogenic ACC show that there are significant structural differences, inc…
The optical properties of a Ce 3+ -ion-doped LiCaAlF 6 (Ce:LiCAF) crystal is investigated in the vacuum ultraviolet (VUV) region. It is found that the optical excitation from the valence band of the LiCAF crystal to the 2 E g excited state of Ce 3+ can be utilized as an efficient excitation channel to obtain an ultrav…
The equipment for the evaluation of the figure of merit ZT has been fabricated and ZT values have been estimated for thermoelectric devices and modules which were simultaneously prepared using the same materials. It is pointed out that the thermoelectric loss from an electrode and a solder as the binder between the p-…
Zn 2 SiO 4 :Mn phosphors for plasma display panels (PDP) application were synthesized by large-scale ultrasonic spray pyrolysis process using metal alkoxide precursor. To avoid the formation of irregular-shaped particles owing to the hollowness and phase-segregation characteristics of the silicon component, organic ad…
y presenta características de ambiente meso-eutrófico.La comunidad fitoplanctónica está dominada por diatomeas del género Melosira (Aulacoseira spp), en casi todo el sistema y durante gran parte del año, siendo acompañadas por cyanobacterias Microcystis aeruginosa en los brazos Gualeguaycito y Mandisoví (margen argent…
Structure, Chemical Bonding and These Thermal Stabilities of Diamond-Like Carbon (DLC) Films by RF Magnetron Sputtering, Nakazawa, Hideki, Mikami, Takamasa, Enta, Yoshiharu, Suemitsu, Maki, Mashita, Masao
Crystals of Ca 3 Co 4 O 9 were grown by a solution method. We found that an appropriate amount of KCl addition to the K 2 CO 3 flux can facilitate the growth of Ca 3 Co 4 O 9 crystals and suppress the crystallization of Ca 3 Co 2 O 6 , which is the decomposed phase of Ca 3 Co 4 O 9 . Using a flux composition of K 2 CO…
Highly integrated field emitter arrays (FEAs) have been fabricated by the transfer mold technique to obtain highly uniform and stable field emission for highly efficient and reliable vacuum microelectronic devices. Transfer mold Mo FEAs containing 9,400,000 emitter tips with high emitter density of 7,840,000 tips/cm 2…
Chalcogenide glasses are promising candidates for all-optical switching and various nonlinear applications. However, we show that As2S3 thin films are photosensitive at wavelengths in the 1.5-microm telecommunication window. This sensitivity is evidenced by the formation of self-written waveguides in slabs, where chan…
X-ray and neutron diffraction and dielectric measurements were performed for the antiferroelectric phase of PbZrO 3 . The antiferroelectric Σ 3 (TO) and the R 25 superlattice-reflection intensities, and the pseudo-tetragonal lattice distortion of the perovskite sublattice showed the same temperature dependence below r…
We report first-principle total-energy electronic-structure calculations in the density functional theory performed for zigzag carbon nanotubes with finite length. We find that the electronic structure of the finite-length nanotubes exhibits certain magnetic ordering. Detailed analyses of energy levels and spin densit…
The phonon-dispersion curves of the YAlO 3 crystal are calculated on the basis of a rigid-ion model using the measured frequency values by Raman and infrared polarized spectroscopy at room temperature. The temperature dependence of the molar heat capacity of YAlO 3 is also calculated using the one-phonon density of st…
Density functional calculations using model clusters were performed to clarify the atomic-scale diffusion mechanism of an O 2 molecule or an O atom in SiO 2 . The activation energy required for the atomic O diffusion was estimated to be 1.3 eV, whereas that for the molecular O 2 diffusion was revealed to be fairly low…
The crystal and magnetic structures of an ordered double perovskite, Ca 2 FeReO 6 , were studied by high-resolution neutron powder diffraction as a function of the temperature from 7 K to 550 K. All of the diffraction data were precisely refined by the Rietveld method, and we confirmed a structural phase transition at…
By using plasma-enhanced chemical vapor deposition (p-CVD), we grew vertically aligned multiwall carbon nanotubes (CNTs) directly on a nickel-silicide layer, which can be used as electrodes for metal-oxide-semiconductor field-effect transistors (MOSFETs). By using a nickel-silicide layer as a catalyst, the nanotube di…
Phase diagrams of charge order patterns of the θ-phase organic conductors are investigated on the basis of the static-limit extended Hubbard model including the second nearest Coulomb repulsion V '. Since the θ-phase is close to the triangular lattice rather than the square lattice, a 3-fold non-stripe charge order is…
The phase transition temperatures, birefringence and visco-elastic coefficient of several high birefringence isothiocyanato tolane compounds were evaluated. The polarizability of these compounds was calculated by the Austin Model 1 (AM1) and Modified Neglect of Diatomic Overlap (MNDO) methods. Using these compounds, w…
Fractal zone plates (FZPs), i.e., zone plates with a fractal structure, are described. The focusing properties of this new type of zone plate are compared with those of conventional Fresnel zone plates. It is shown that the axial irradiance exhibited by the FZP has self-similarity properties that can be correlated to…
Si(100) surfaces were prepared by wet-chemical etching followed by 0.3-1.5keV Ar ion sputtering, either at elevated or room temperature. After a brief anneal under ultrahigh vacuum conditions, the resulting surfaces were examined by scanning tunneling microscopy. We find that wet-chemical etching alone cannot produce…
The Si(001) surface morphology during ion sputtering at elevated temperatures and solid phase epitaxy following ion sputtering at room temperature has been investigated using scanning tunneling microscopy. Two types of antiphase boundaries form on Si(001) surfaces during ion sputtering and solid phase epitaxy. One typ…