Materials Literature
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We have performed an ab initio study of the surface energy and the work function for six close-packed surfaces of 40 elemental metals by means of a Green's-function technique, based on the linear-muffin-tin-orbitals method within the tight-binding and atomic-sphere approximations. The results are in excellent agreemen…
The dependences of the specific saturation magnetization sigma (C), magnetic ordering temperature T C (C), average hyperfine field H(C) and average isomer shift delta (C) on Si concentration are measured in crystalline Fe-Si alloys disordered by mechanical crushing. It is shown that topological disordering does not de…
We present a model for the injection of minority carriers into porous silicon films which results in visible dc electroluminescence. A thin interfacial dielectric region is postulated between the surface of the porous silicon layer and a transparent conductive oxide on the surface, which allows alignment of states bet…
The authors report a comparative study of the L 3 -M 45 M 45 Auger spectra of Cu, Cu 2 O and CuO. The large intensity of the uncorrelated two-hole band-like spectrum in the L 3 -M 45 M 45 Auger spectra of Cu 2 O and CuO and the spectral shapes for these transitions indicate strong Cu 3d-O 2p hybridization in the oxide…
Using a multiple light scattering technique and a stabilizing counterflow (i.e., a fluidized bed), we measured the average sedimentation velocity, its variance, and the short-time self-diffusion coefficient in a concentrated hard-sphere suspension. Many-body hydrodynamic interactions slow both the Brownian diffusion a…
In the above reference, we prove that certain quantum spin chains with quantumalgebra symmetry are integrable. Specifically, these are the quantum-algebra-invariant open chains associated with the affine Lie algebras A (1) 1, A(2) 2n, A(2) 2n−1, B(1) n, C (1) n, and D (1)
The radiation-induced absorption in erbium-doped optical fibres (EDfs) has been found to be strongly dependent on the fibre core composition. Implictions for erbium-doped fibre amplifier (EDFs) performance have been modelled, and compositional variations which may increase their radiation hardness have been tentativel…
The phenomenon of interfacial AC and DC breakdown is the subject of this paper. Two pieces of EPDM rubber were pressed together and a special jig was conceived so as to provoke arcing along the interface. The voltage at which breakdown occurred was measured and its dependence on the type of voltage (AC or DC), the int…
Many aspects of electrical tree growth can be simulated by a model which neglects the microscopic degradation processes involved and models only the overall form of the tree and its interaction with the material and the applied field. The simulated trees generated by the model, like real electrical trees, have a distr…
It is shown by dielectric resonance absorption at 60 GHz that there is a linear coupling of the electric field to the ground state of effective mass acceptors in Si reflecting the lower ${\mathit{T}}_{\mathit{d}}$ symmetry in the central portion of the ground-state wave function. The coupling increases strongly with i…
The author reports a study of room temperature photoluminescence, electromodulation and Raman scattering experiments on CdS x Se 1-x quantum dots of various sizes (18 AA to 108 AA) embedded in a glass matrix. The Raman experiment confirms that all the samples have the same semiconductor composition. Electromodulation…
We report results from computer simulations of the kinetics of domain growth and wetting in a binary liquid mixture contained inside a model porous medium which has an interconnected and tortuous structure resembling Vycor glass. We find that the growth process slows down dramatically when the average size of the doma…
The structural order of the two-dimensional (2D) charge-density-wave (CDW) phase in ${\mathrm{Nb}}_{\mathit{x}}$${\mathrm{Ta}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{S}}_{2}$ materials has been determined as a function of impurity concentration from the quantitative analysis of scanning tunneling microscopy im…
All vacuum-deposited metal/semiconducting polyaniline hetrojunction Schottky devices using vacuum-evaporated polyaniline films of a thickness of the order of 0.1 μm have been prepared. Schottky junctions have been formed using the following metals, Al, Sn, In, Pb, Sb, and Ag. Electrical characterization has been carri…
Epitaxial, boron-doped diamond films were grown by hot-filament-assisted chemical vapour deposition (CVD) on (100) and (110) natural diamond substrates. Resistivity measurements for 10 K<T<500 K showed a clear transition from band to hopping conduction upon lowering of temperature. In the band conduction regime, the (…
We present results of photoluminescence experiments performed at 2 and 300 K on porous silicon layers with different porosities. The samples are obtained by electrochemical dissolution of (100) silicon wafers in hydrofluoric solution. The energy of the photoluminescence and its variation with porosity are found in goo…
The correlation lengths of vitreous structures estimated from the low-frequency (boson) peak in Raman spectra and from the width of the first sharp diffraction peak are compared. This first comparison shows that the two estimates, which are based on dynamic and static properties, respectively, are in good quantitative…
Abstract The influence of natural, activated, and modified microzeolite with the general formula Me 2/ m · Al 2 O 3 · n SiO 2 · p H 2 O (where Me = Fe 3+ , Ca 2+ , Mg 2+ , Zn 2+ , K + , Na + ) and an organic additive, such as ammonium sulfamate combined with ammonium sulfate on smoke formation and flammability of susp…
Abstract High‐molecular‐weight polyethylene (HMWPE) sheets have been cold rolled biaxially to different reductions in thickness. After 40% or more reduction in thickness by cold rolling, the stress‐whitening phenomenon in HMWPE was eliminated. To find out the reason of elimination of stress whitening by cold rolling,…
Abstract The binary blend of high‐density polyethylene (HDPE) and linear low‐density polyethylene (LLDPE) in the range of composition from 100% HDPE to 100% LLDPE has been investigated for tensile and flexural properties and the morphology in the deformed state on tensile fracture. Tensile properties (initial modulus,…