Materials Literature
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Many properties of disordered materials can be understood by looking at idealized structural models, in which the strain is as small as is possible in the absence of long-range order. For covalent amorphous semiconductors and glasses, such an idealized structural model, the continuous-random network, was introduced 70…
We have shown, both experimentally and theoretically, that the metal-induced gap states (MIGS) can exist in epitaxially grown organic insulator/metal interfaces. The experiment is done for alkane/Cu(001) with an element-selective near edge x-ray absorption fine structure (NEXAFS), which exhibits a pre-peak indicative…
We present high-frequency high-field electron paramagnetic resonance (EPR) measurements on the $[{\mathrm{Mn}}_{12}{\mathrm{O}}_{12}{({\mathrm{O}}_{2}\mathrm{C}\mathrm{C}{\mathrm{H}}_{2}\mathrm{Br})}_{16}{({\mathrm{H}}_{2}\mathrm{O})}_{4}∙4\mathrm{C}{\mathrm{H}}_{2}{\mathrm{Cl}}_{2}]$ dodecanuclear manganese complex $…
We study diffusion of self-interstitial atoms (SIAs) in vanadium via molecular-dynamics simulations. The ⟨111⟩-split interstitials are observed to diffuse one-dimensionally at low temperature, but rotate into other ⟨111⟩ directions as the temperature is increased. The SIA diffusion is highly non-Arrhenius. At $T<60…
We present the results of Monte Carlo simulations of the magnetic properties of individual spherical nanoparticles with the aim to explain the role played by surface anisotropy on their low temperature magnetization processes. Phase diagrams for the equilibrium configurations have been obtained, showing a change from…
Abstract Epoxy/clay nanocomposites were prepared by swelling organoclay in an epoxy resin, diglycidyl ether of bisphenol A, followed by curing with an aromatic hardener, diethyltoluenediamine. A combination of X‐ray diffraction with transmission electron microscopy showed the coexistence of intercalated and exfoliated…
The need for spin-injectors having the same zincblende-type crystal structure as conventional semiconductor substrates has created significant interests in theoretical predictions of possible metastable ``half-metallic'' zincblende ferromagnets, which are normally more stable in other structure-types, e.g., NiAs. Such…
To achieve low percolation thresholds in single wall carbon nanotube (SWCNT) and thermoplastic poly(butylene terephthalate) (PBT) composites, we have used an in situ polycondensation reaction process. The intense dispersion process achieved first by ultrasonication and followed by ultrahigh speed stirring of single wa…
Lattice-structural, magnetic, and magnetoelectric (ME) properties have been investigated for single crystals of prototypical polar ferrimagnet ${\mathrm{Ga}}_{2\ensuremath{-}x}{\mathrm{Fe}}_{x}{\mathrm{O}}_{3}$ $(0.8\ensuremath{\leqslant}x\ensuremath{\leqslant}1.4)$ as melt-grown by a floating-zone (FZ) method. Magnet…
A series of different benzaldehydes-4-tolyldiphenylamine polymers has been oxidized by 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) and tetrachloro-1,4-benzoquinone (p-chloranil), and also doped by 10-camphorsulfonic acid in order to increase their conductivity. The doped polymers were characterized by 1H NMR spect…
The conditions under which quartz microtubes 5–10 µm in diameter are formed in the course of structuring oxidized macroporous silicon are reported. It is shown that microtubes with a closed bottom can be fixed in a vertical position at equal distances from one another in correspondence with the “lattice” of macroporou…
The Laboratoire Infrarouge (LIR) of the Laboratoire d’Electronique, de Technologie et d’Instrumentation (LETI) has been involved in the development of microbolometers for several years. Therefore a first generation of a high performance technology made from amorphous silicon thermometer has been transferred to ULIS in…
Metal chelating polymers containing amide and carboxylic groups were prepared by gamma‐radiation polymerization of acrylic acid (AA) monomers in the presence of polyacrylamide (PAM). The resins obtained were loaded by copper ions and characterized by FT‐IR spectroscopy, electron spin resonance (ESR), thermogravimetric…
Weight fractions of four dominant phases (C 3 S, C 2 S, C 4 AF, and C 3 A) present in five industrial clinkers were estimated by a series of neutron and X-ray Rietveld refinements. Calculated powder patterns were derived from the structural data for monoclinic and triclinic C 3 S, monoclinic C 2 S, orthorhombic C 4 AF…
We have experimentally investigated the dynamics of the phase ordering process of bent-core molecules at isothermal conditions, forming the liquid crystalline "banana" B1 phase from the isotropic melt. In contrast to the fractal growth patterns observed for other "banana" liquid crystal phases, the B1 phase exhibits d…
Inherently conducting polymer (ICP), polyaniline, was synthesized by an in situ chemical polymerization method using camphor sulfonic acid (CSA), p‐toluene sulfonic acid (p‐TSA), and dodecyl benzene sulfonic acid (DBSA). Electronic absorption spectra of doped polyanilines were recorded using m‐cresol as a solvent. The…
Abstract Novel porphyrins and chlorins that self‐assemble in nonpolar solvents in a manner similar to that of the bacteriochlorophylls c , d , and e have been synthesized by a common protective group approach. The supramolecular assemblies have broad and red‐shifted absorption spectra in comparison to those of the mon…
A new technological process for fabricating structures with vertical walls in a thick layer of macroporous silicon on a substrate is reported. The problem of photolithography has been solved by patterning on the back side of the wafer. As a result, the silicon substrate itself serves as a mask through which certain pa…
Spectra of photoluminescence and electron spin resonance were investigated for ZnS powders annealed in the presence of metallic Ga with limited access of atmospheric air. Analysis of these spectra showed that there was no Ga impurity in the annealed ZnS powders. It was established that subsequent free access of air to…
Abstract We report on a study of magnetic cluster in Co‐doped ZnO using neutron diffraction. The samples are fabricated by the sol–gel process and the structural properties are characterized by X‐ray diffraction and neutron diffraction. The diffraction data obtained by neutron are compared with the results of X‐ray di…