Materials Literature
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Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
Magnetic and electric properties are studied of an organic ferromagnet of pyrolysed polyacrylonitrile (PAN) and of its composites with an epoxy which are of great interest for practical use. Possible models of the pyro-PAN ferromagnetic macromolecules are presented. Unusual magnetic properties of the composites obtain…
Volume diffusion of 14C in high purity α-Fe single crystals is measured in the wide temperature range of 1168 to 596 K applying the radiotracer technique and serial sectioning of the samples. In the temperature range in which the present tracer and previous Snoek-effect measurements overlap a good agreement is found b…
Abstract The Ruddlesden-Popper structural family is constructed from ordered intergrowths of rocksalt type (AX) layers with perovskite (ABX3) blocks of varying widths, yielding phases with the general formula nABX3 AX where 1 < n < ∞ In this article, the characterization of (CaxSr1-x)n+1TinO3n+1 layer pe…
High-resolution I 4d photoelectron spectra (total instrumental resolution 0.06 eV) of several iodine molecules, ICl, IBr, ${\mathrm{I}}_{2}$, and ${\mathrm{Ch}}_{2}$${\mathrm{I}}_{2}$, are reported. The inherent I 4d Lorentzian linewidths increase in the above order, due to the decrease in electronegativity of the moi…
Diamond films were deposited on the silicon wafer at as low a temperature as 135 °C by filament-assisted chemical vapor deposition. Silicon wafer substrate scratched with diamond powder was cooled by a stream of water flowing around a substrate holder. The films were identified as diamond by Raman spectroscopy. Clearl…
In this letter we report the first ever fabrication and characterization of reflective quarter wave filter stacks based on single-crystal GaN/AlxGa1−xN multilayers. The filters were designed for peak reflectivities at 400 and 450 nm. The designed epitaxial layers were deposited using a low-pressure metalorganic chemic…
The compressive deformation behavior of Nd2Fe14B single crystals at temperatures between 900 and 1100 °C has been investigated. Considerable ductility occurs only at temperatures above 1000 °C, suggesting that the plasticity of the Nd2Fe14B phase has very little effect on the formation of texture during die-upsetting…
Cobalt thin films were prepared by a low-temperature atmospheric-pressure chemical vapor deposition method. The raw material was cobaltous acetate which is nontoxic and easy to handle. At a reaction temperature of 300 °C, [111]-oriented polycrystalline films can be obtained on amorphous substrates. Increasing the H2 p…
Self-fracturing of solids during chemical transformations is considered, and a first quantitative model of this widespread phenomenon is proposed. The analysis begins by considering the equilibrium of a single crack, and proceeds with the behavior of an ensemble of cracks. This enables one to solve the ``selection pro…
The drag force (per unit length) acting on a steadily moving disclination line is calculated. The problem is formulated in two equivalent ways: One involving a linear partial differential equation but with ambiguous boundary conditions, and another involving a nonlinear equation but with uniquely defined boundary cond…
We have investigated both the structures and the excitation spectra produced by submonolayer adsorption of potassium on the surface of graphite at 90 K, using high-resolution low-energy electron diffraction in conjunction with high-resolution electron-energy-loss spectroscopy. We show that at very low coverages a disp…
Molecular beam mass spectrometry has been used to determine the concentrations of several free-radical and stable gaseous species in a hot-filament reactor under diamond-growth conditions. At a filament temperature of 2600 K, the H-atom concentration in the proximity of the growth surface was found to decrease with in…
We have measured the Compton-scattering cross section on hydrogen at 60\ifmmode^\circ\else\textdegree\fi{} and 135\ifmmode^\circ\else\textdegree\fi{} using monochromatic tagged photons spanning the energy between 32 and 72 MeV. These data, when analyzed with a low-energy expansion of the scattering cross-section formu…
Nonergodicity parameters, the nondecaying components of the coherent intermediate scattering functions, of ``hard-sphere'' colloidal glasses were measured by dynamic light scattering. These agree reasonably well with the predictions of mode-coupling theory for hard-sphere atoms, with no adjustable parameters in the co…
The electronic structure of the formally ${\mathrm{Cu}}^{3+}$ (${\mathit{d}}^{8}$) compound ${\mathrm{NaCuO}}_{2}$ has been studied by photoemission spectroscopy and subsequent cluster configuration-interaction calculations. We find that the ${\mathit{d}}^{8}$\ensuremath{\rightarrow}${\mathit{d}}^{9}$L (L: ligand hole…
Silicon ${\mathit{L}}_{2,3}$ absorption spectra are obtained by spatially resolved electron-energy-loss spectroscopy as a function of distance away from the buried Al/Si(111) interface. Within 0.6 nm, scattering below the bulk absorption threshold is observed, accompanied by changes in shape above the threshold. In si…
The cooperative motion algorithm is applied to simulate static properties of a polymer melt confined between two parallel walls, where the melt consists of linear chains which are grafted by one end to one wall. The results characterizing the structure of layers, as well as the conformation and orientation of chains,…
The symmetry arguments of Appelbaum, Baraff, and Hamann for integrals of physical quantities for the (110) and (100) surface orientations of zinc-blende-structure crystals are generalized for other crystals and surface orientations of lower symmetry. We define the surface region by identifying boundaries in the interi…
Boron nitride films prepared by reactive ion plating from a boron evaporation source were characterized structurally using three independent electron optical techniques: energy filtered electron diffraction with radial distribution function analysis; electron energy-loss spectroscopy of the near-edge structure of the…