Materials Literature
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An investigation was made of the energy transfer between Eu 2+ and Mn 2+ ions in CaCl 2 single crystals under photoexcitation. The studies performed at several impurity concentrations and the measurements of the excitation spectra and lifetimes of the observed europium and manganese emissions in the temperature range…
Epitaxial thin films of cobalt ranging from 1 ML up to 10 ML have been grown on a Cu(100) substrate and characterized by LEED. The cobalt is found to grow, adopting a slight tetragonal distortion of its high-temperature FCC phase. Further growth of 5 ML Cu on top of a 5 ML Co film results in an almost perfect Cu(100)…
We present results of the electronic structure and stability of some forty valence electron icosahedral ${\mathrm{Al}}_{12}$X (X=B, Al, Ga, C, Si, Ge, Ti, and As) clusters within the local spin density functional theory. It is shown that the stability of the ${\mathrm{Al}}_{13}$ cluster can be substantially enhanced b…
Introducing holes (or partly eliminating electrons) in Mott-Hubbard insulator ${\mathrm{LaTiO}}_{3}$ (with 3${\mathit{d}}^{1}$ configuration) can be carried out by partial substitution of La with Sr, which produces the strongly correlated metallic phase. Systematic variation of electronic properties in ${\mathrm{Sr}}_…
The possibility induction of light emission from silicon, an indirect bandgap material in which radiative transitions are unlikely, raises several interesting and technologically important possibilities, especially the fabrication of a truly integrated optoelectronic microchip. In this article, the natural considerati…
Commercial Zn-Al alloys are susceptible to Intergranular Corrosion (IGC) restricting their widespread use for various applications. In this paper the IGC behaviour of two important foundry alloys namely Zn-8Al and Zn-12Al has been studied through microstructural observations with a view to improving the resistance to…
We still have much to learn about the morphologies of natural and synthetic polymers crystallized in bulk. Nevertheless, conventional X-ray and thermodynamic studies of crystallinity in polymeric materials over the past 60 years have given us a clear picture of the concept of crystallinity and the molecular features w…
Dislocations produced in Ge by high-temperature indentation have been studied using high-resolution transmission electron microscopy. An interesting defect has been observed which consists of a 1/6⟨411⟩ partial dislcation separated by an intrinsic stacking fault from a 1/6⟨121⟩ 30° partial. The unusual 1/6⟨411⟩ partia…
Polyallylamine and polystyrene beads were allowed to react with 3,5-dibutyl-4-hydroxybenzaldehyde (BHB) and t-butylhydroquinone (BHQ), respectively. The polymeric products, poly-Aa(BHB) and polySt(BHQ) beads worked functionally as antioxidants. The antioxidant effect of the polymer beads in the oxidation of linoleic a…
As found from previous studies, a Gaussian curve describes the swelling by various liquids of a series of nitrile rubbers containing from 0 to 50% bound acrylonitrile. The curves pass through a maximum at a value, A. While not without their shortcomings, the swelling curves do present a fairly accurate picture of how…
CO/sub 2/-laser-induced photovoltaic and photoconductive effects have been studied experimentally in silicon junctions. The response is slightly nonlinear or linear for the lower excitation intensities used, in opposition to the extremely nonlinear high-excitation-intensity regime. Abrupt changes in the slope of the g…
Raman spectra from o-terphenyl sealed in glass capillary tubes were acquired over temperatures ranging from 233 K to 343 K. Over this temperature range, o-terphenyl can exist in the solid-crystalline, molten, supercooled-liquid, and amorphous-glassy states. Representative structure-sensitive spectra are presented alon…
Tetra-4-pyridylporphyrin (TPyP) derivatives of Ga(III), In(III) and Tl(III) have been prepared and isolated as acetate salts. In(III)TPyP and Ga(III)TPyP have been characterized by FABMS, and the 1H-NMR, UV-visible and fluorescence spectra have been recorded for all complexes.
It has been clarified for the first time that the light scattering profile of amorphous matter, e.g ., polymethylmethacrylate (PMMA) and quartz glass, in the glassy state displays two aspects in precise light scattering measurements in which optical resolution power is enhanced for a scattering angle. One aspect is of…
The chalcogenide alloys AsSGe have been prepared by a melt-quenching method and their density, microstructure and ultrasonic longitudinal sound velocity have been investigated at 15 MHz. The longitudinal modulus was calculated and its dependence on the composition and mean atomic coordination number, r, found. It is…
Abstract The analytic expressions for the five elastic constants of an h. c. p. lattice are deduced. These expressions are appropriate for fitting empirical many‐body interatomic potentials of the embedded atom type. The uniform deformation method is used together with the lattice symmetry properties. These greatly si…
The mixed-oxide (MOX) fuel of the current generation (MIMAS) is confronted with the challenge of reaching the same quality and reliability as UO2 fuel, while the related data base accumulated so far is still limited. Its in-reactor behavior, therefore, has been assessed based on the lessons from previous generations o…
The structure of lovozerite is derived from perovskite. For 24 members of the lovozerite family an aristotype is postulated. The method of quantitative comparison using the concept of mappings is applied to the lovozerite family using the aristotype as a «structural unit». The method is extended to relationships of sy…
The adsorption of on transition metal electrodes was characterized by means of pseudocapacity measurements. It turned out that the metal with high pseudocapacity in solutions are promising electrocatalysts for the electrochemical reduction of . A correlation was found between the electronic structure of transition met…
Protein concentrations in three aquacultural recirculation systems and protein removal by foam fractionation were investigated. The results revealed that protein concentrations ranged from less than 1 to 127 mg/L in the systems tested and averaged about 4% of the concentrations of total volatile solids. These proteins…