Materials Literature
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We have measured the site-specific valence electronic structure of $\ensuremath{\alpha}\ensuremath{-}{\mathrm{Fe}}_{2}{\mathrm{O}}_{3}$ by using a spatially modulated x-ray standing wave as the excitation source for photoemission. Contributions to the valence-band density of states from oxygen and iron ions are separa…
The loss factor (tan δ) of ferroelectric material at microwaves and the tunability (n) defined as a ratio of the dielectric permittivity at zero dc field to the dielectric permittivity at the given field are strongly connected with the softness of so-called ferroelectric soft mode. The loss factor and the tunability a…
a- and b-axis-oriented epitaxial Bi4Ti3O12 films were prepared on (101)TiO2 (rutile) substrates at 630 °C by metalorganic chemical vapor deposition and their perfect epitaxial growths were confirmed by several x-ray diffraction measurements. As the bottom electrode, (101)-oriented conductive materials with the same ru…
The Heusler alloys are a group of magnetic materials that will form essential components in hybrid, ferromagnet–semiconductor devices that utilize spin injection. We demonstrate that such an alloy, Co2MnGa:GaAs(001) is ferromagnetic at 300 K and has controllable magnetic properties. A weak in-plane uniaxial anisotropy…
We investigate the electro-optical properties of polymer stabilized nematic liquid crystals produced by in situ photopolymerization technique using Gaussian laser beam. The distribution of refractive index in such structure under the action of a homogeneous electric field reveals a non-homogeneous lens-like character,…
Based on first-principles theoretical calculations, we find that on pristine single-wall carbon nanotubes (SWNT's), the dissociative adsorption of ${\mathrm{H}}_{2}$ molecules is severely suppressed due to very high energy barriers of about 3 eV, while H atoms have low-energy barriers less than 0.3 eV. On Li-doped SWN…
Nanoclusters of crystalline SnO2 have been grown in glass, starting from tin-doped silica prepared by a sol–gel method. Based upon a particular choice of molecular precursors, nanocrystallites with a mean radius of about 1 nm and a quite narrow size dispersion were obtained, resulting in wide-band-gap (>4 eV) q…
Double-wall carbon nanotubes (DWNT's) have been studied by Raman scattering using different excitation wavelengths and their spectra compared to those of single wall nanotubes (SWNT's) and ${\mathrm{C}}_{60}$-SWNT peapods. Raman scattering from the radial and tangential vibrational modes of very small diameter $d\ensu…
We have investigated the thermodynamic and kinetic barriers involved in the synthesis of MgB2 films. This work refines our initial conjectures predicting optimal MgB2 thin film growth conditions as a consequence of the unusually large kinetic barrier to MgB2 decomposition. The small Mg sticking coefficient at temperat…
The magnetocrystalline anisotropy in a single-crystal Co37Ni34Al29 ferromagnetic shape-memory alloy has been investigated. The prestrain was applied to the parent phase in order to nucleate the specific variant in the sample cooled down through the martensitic transformation temperature. The applied magnetic field fac…
The use of oxide materials in oxide electronics requires their controlled epitaxial growth. Recently, it was shown that Reflection High Energy Electron Diffraction (RHEED) allows to monitor the growth of oxide thin films even at high oxygen pressure. Here, we report the sub-unit cell molecular or block layer growth of…
We present the itinerant coherent-potential approximation(ICPA), an analytic, translationally invariant and tractable form of augmented-space-based, multiple-scattering theory in a single-site approximation for harmonic phonons in realistic random binary alloys with mass and force-constant disorder. We provide express…
Jamming in hard-particle packings has been the subject of considerable interest in recent years. In a paper by Torquato and Stillinger [J. Phys. Chem. B, 105 (2001)], a classification scheme of jammed packings into hierarchical categories of locally, collectively and strictly jammed configurations has been proposed. T…
Using soluble polymers for the active layer and insulating layer, we report on a concept for the fabrication of fast integrated circuits based on p-type organic transistors only. Ring oscillators with frequencies above 100 kHz and propagation stage delays below 0.7 μs are presented. They show a very stable performance…
The field emission capability of the carbon nanotubes (CNTs) has been improved by hydrogen plasma treatment, and the enhanced emission mechanism has been studied systematically using Fourier-transform infrared spectroscopy, Raman, and transmission electron microscopy. The hydrogen concentration in the samples increase…
This paper is an essay on mosaic structures in glasses, and their possible role in relaxation phenomena. (a) Near T g the fluid is assumed to contain clusters, slightly more compact than the matrix: they cannot grow in size because of frustration effects, as noted by Kivelson and others. (Mode/mode coupling theories c…
The interaction of CH 3 SH with TiO 2 (110) has been studied with a combination of synchrotron-based high-resolution photoemission, thermal desorption mass spectroscopy, and first-principles density functional slab calculations. On the Ti and O sites of a perfect TiO 2 (110) substrate there is no dissociation of CH 3…
A series of mixed layered Ni(OH) 2 −manganese oxides with Ni/Mn molar ratios up to near 1 were prepared by using a novel exfoliation−restacking hydrothermal method and a hydrothermal intercalation method. A series of lithium nickel manganese oxides with hexagonal layered structure (space group R 3̄ m ) can be obtained…
A series of 1‘-substituted 6-nitro-3‘,3‘-dimethylspiro(2 H -1-benzopyran-2,2‘-indoline) compounds ( 3 − 8 ) of different functionality were synthesized, and the rate of thermal decay was measured in polar and nonpolar solvents and in two organogels. A significant retardation of the decay rate was observed for spiropyr…
To seek new potential materials for hydrogen storage, an arc-discharge method was employed to prepare nanosized nickel(or cobalt)/graphite composites, in which the nickel (or cobalt) particles were highly dispersed in a carbon matrix with particle size between 20 and 70 nm (or 5−20 nm). Quantitative TPD measurements s…