Materials Literature
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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…
TiO$_2$ anatase doped with Co has been recently reported to exhibit room-temperature ferromagnetism. $Ab$ $initio$ study on substitutional Co doping, however, yielded much larger magnetic moment for Co than experiment. Our calculations based on density-functional theory show that the substitutional Co ions incorporate…
Room-temperature ferromagnetism has been recently discovered in Co-doped TiO$_2$ rutile. Our $ab$ $initio$ density-functional theory investigations show that the substitutional Co ions incorporated into TiO$_2$ rutile tend to cluster and then the neighboring interstitial sites become energetically favorable for Co to…
The electrochemical polymerization of bis(2-thienyl)methanes carrying substituents either on the methylene carbon or on the thiophene rings is reported. Poly(dithienylenemethylene)s are formed which undergo in-situ dehydrogenation to poly(dithienylenemethine)s. Bis(3,4-ethylenedioxythienyl)methane gave a very low-gap…
The growth of macromolecules in reactive systems is associated with slowing down of the structural motions in a manner that closely resembles the effect of cooling or compressing glass-forming liquids. Depolarized photon correlation spectroscopy which probes the molecular dynamics of a material via optical anisotropy…
During the growth of small colloidal silver clusters in aqueous solution, the trimer silver ion exhibits a remarkable behavior in that this species represents the changeover from pseudo-first-order reaction mechanisms to second-order mechanisms. The model for the molecular structure of the trimer silver ion which is p…