Materials Literature
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The evolution of dislocation structures in technological high strain deformation of ‘wavy glide’ metals is studied by the examples of pure aluminium, nickel, copper and hot deformed stainless steel, and compared with the earlier observations by Langford and Cohen on drawn iron wire and Wert et al. on rolled aluminium…
An attempt to introduce a thermodynamic classification of dislocation structures produced by cyclic deformation is made. A fundamental division is proposed for all types of dislocation structures into two classes: 1. those in equilibrium and 2. strongly non-equilibrium self-organized dislocation structures (“SODS”). I…
The microstructural evolution is followed in pure aluminium and nickel cold-rolled over a large strain range. A number of dislocation configurations are characterized and classified and it is found that dislocation rotation boundaries are the dominant feature which subdivide the grains on a finer and finer scale as th…
Abstract Polyaniline/polypropylene composites were prepared by oxidative polymerization of aniline in biaxially stretched polypropylene microporous films with ammonium persulfate as the oxidant. A continuous permeation/diffusion polymerization process was used in order to incorporate more polyaniline in the composite.…
Abstract A thermoset type anisotropic conductive adhesive film (ACAF), which electrically connects an ITO glass and a flex circuit both having conducting pattersn of less than 100 μm in pitch, has been developed. In this development, bisphenol A and bisphenol F epoxy resins were tested to formulate an ACAF with easy‐t…
The effect of crystallographic orientation on the microstructural evolution in f.c.c. metals with medium to high stacking fault energy is analyzed. This analysis is based on a literature review of the behaviour of single crystals and polycrystals supplemented with an experimental study of cold-rolled pure aluminium. I…
This paper describes a simple and general method for deriving the inelastic collision term in the electron Boltzmann equation for scattering from a coupled electron-phonon system and applies the method to the case of doped polar semiconductors. In the Born approximation, the inelastic differential scattering rate ${\m…
A method is proposed to describe the influence of hydrodynamic conditions or. precipitation processes. It is based on spatially distributed moment equations, on relations for the kinetics of nucleation and growth of the precipitating compound and on the solution of the flow field as calculated by the commercially avai…
Structure refinement on a crystal of composition Mn<sub>3</sub>Al<sub>10</sub> were performed in space groups Pnma and Pn2<sub>1</sub>a (standard setting Pna2<sub>1</sub>). The space group Pnma was found to be correct.
The dielectric constant of Pb 2 x Sn 2(1- x ) P 2 S 6 single crystals was measured at several frequencies from 0.1 to 100 kHz between 3.7 and 420 K. No phase transition is observed at x =1.0. The ferroelectric-paraelectric phase transition temperature decreases linearly as x increases, but curves slightly around x =0.…
Interatomic Auger transition rates of holes in the two outermost alkali-metal ion core levels have been measured in the sodium halides. The Na 2s core hole, which decays via a singly interatomic Coster-Kronig process, has a lifetime width of 0.75\ifmmode\pm\else\textpm\fi{}0.15, 0.45\ifmmode\pm\else\textpm\fi{}0.10, a…
Homogeneous thin films of a-CdTe:O were thermal annealed in an Ar flux. The as-grown samples have an amorphous structure. The annealed films crystallize to a mixture of both CdTe and CdTeO3. For low annealing temperatures (less than 100 °C) it is possible to get CdTe crystallites with sizes smaller than 14 nm. In this…
Based on the ion hopping model, the dielectric dispersion of insulating films with long-range movements of charge carriers has been analyzed without neglecting space-charge field and diffusion. The complex dielectric constant of films with long-range movements of charge carriers (impurity ions) which are blocked at th…
Valence-band photoemission spectra from a variety of alkali halides are shown to be well represented by a phonon-broadened density-of-states histogram with well-determined bandwidths and three or four main peaks. The bandwidths are generally in good agreement with band-structure calculations. The phonon broadening is…
Lanthanum modified lead zirconate with La to 8 at. % were prepared using mixed oxide method and followed by hot press sintering. The basic characterization included: dielectric spectroscopy, Sawyer–Tower polarization measurements, and temperature dependent selected area electron diffraction techniques. An intermediate…
We have studied optical properties of Si-backbone polymers constructed by the organosilicon units having two or three Si-Si bonds in order to understand the mechanism of visible luminescence in silicon-based materials. The backbones of branch, ladder, and network polymers are constructed by the organosilicon units wit…
An efficient method developed for the calculation of quasiparticle corrections to density-functional-theory--local-density-approximation (DFT-LDA) band structures of diamond and zinc-blende materials is generalized for crystals with other cubic, hexagonal, tetragonal, and orthorhombic Bravais lattices. Local-field eff…
We present a quantitative analysis of the absorption and field-induced absorption (electroabsorption) spectra of dilute blends of the conjugated polymer poly[2-methoxy,5-(2'-ethyl-hexoxy)-p-phenylene vinylene] (MEH-PPV) oriented in ultrahigh-molecular-weight polyethylene (PE). Because of the orientation, the enhanced…
Ab initio and density functional calculations suggest that the carbenic tautomer 1 of an N-confused porphyrin is electronically similar to stable, nucleophilic, aromatic Arduengo-type carbenes such as 2, as reflected by ionization potentials and single–triplet energy gaps. In addition, this gives a partial explanation…
The nucleation and growth kinetics of epitaxial Ba2YCu3O7−x thin films prepared on (001) SrTiO3 by postdeposition annealing of a chemically derived intermediate layer were investigated in specimens quenched from the growth anneal. The films were produced by spin-on deposition of a metal-organic precursor solution at r…