Materials Literature
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Orbital ordering in crystals with degenerate localized levels ${\mathit{E}}_{\mathit{g}}$ and ${\mathit{T}}_{2\mathit{g}}$ is investigated on the basis of the symmetry of atomic density matrices and their transformation properties. During ordering processes, several kinds of local state can be stabilized, among which…
Abstract The reduction of risks associated with chemical processing operations is essential for the safe operation of chemical plants. The reduction of these risks is accomplished through a comprehensive process safety management program. Key elements of this program include Hazard and Operability Studies, Emergency R…
Abstract Erstmals wurden Einkristalle von farblosem RbKS durch Tempern eines äquimolaren Gemenges aus Kaliumsulfid und Rubidiumsulfid bei 820 K er‐ halten. Die sehr hygroskopische salzartige Verbindung kristallisiert orthorhombisch, Raumgruppe Pnma, a = 822,2(3), b = 504,3(4), c = 945,2(2)pm, Z = 4 im anti‐PbC1 2 ,‐St…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-pressure phase transition in lithium deuteroxide: a neutron powder diffraction and vibrational spectroscopic studyDavid M. Adams, Andrew G. Christy, and Julian HainesCite this: J. Phys. Chem. 1992, 96, 20, 8173–8176Publication Date (Print):October 1, 1992Publication His…
The compounds Mg 2 Ni 3 P and Mg 2 Ni 3 As were prepared by heating the elements. Their structures have been determined from single-crystal X-ray data. The structure of the phosphide is a rhombohedral ternary variant of the cubic Laves structure type MgCu 2 (R 3̄ m; hexagonal lattice constants: a = 4.971(0) Å, c = 10.…
Abstract Die Röntgen‐Absorptionsspektroskopie an Oberflächen ist eine Methode zur Bestimmung der lokalen Geometrie adsorbierter Atome und Moleküle und damit eine Methode der „Oberflächen‐Kristallographie”︁. Sie wurde erst durch den Bau leistungsfähiger Synchrotron‐Strahlungsquellen möglich, die ein intensives und über…
Microstructural characterization of a high‐Al 2 O 3 substrate containing cofired thick‐film tungsten metallization, with particular emphasis on the metal/ceramic interface, was conducted. The substrate contained tabular Al 2 O 3 grains surrounded by a continuous calcium magnesium aluminum silicate glass containing par…
The theoretical potential energy function has been generated and used in the evaluation of the vibration-rotation energy levels of the 1A1 electric ground state of Si2C. For the bent equilibrium structure, the rotational constants and the vibrational band origins up to 1200/cm are given. The height of the barrier to l…
Two series of TeO2-P2O5 And Bi2O3-TeO2-P2O5 glass systems have been prepared for the present investigation. Measurements of the dc electrical conductivity in the temperature range of 300-573k for unirradiated and y-irradiation glass samples are reported. The dc electrical conductivity are found to increase with increa…
Article Influence of cation coordination on nucleation in silicate glasses was published on October 1, 1992 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 200, issue 1-4).
A formalism is developed for evaluating the effects of pair correlations on cascading of the nonlinear susceptibilities of fluid dielectrics. The corresponding correlative and nonlinear alterations of the usual local-field corrections are determined. These corrections to the nonlinear susceptibilities when the polariz…
Efficient infrared-to-visible upconversion is achieved in the YCl 3 -ErCl 3 -PbCl 2 -KCl phosphor system. Under 1.52 µm laser diode (LD) excitation, a specimen containing 20 mol% Er 3+ dopant emitted bright green luminescence, and the fluorescence lines at 410 nm, 550 nm and 660 nm reached the respective intensities o…
The study of the physicochemical properties of pure amorphous materials (complexes) consisting of Fe 2 O 3 and SiO 2 in various proportions indicates that the amorphous complexes will exhibit different properties and characteristics depending on the proportions of Fe 2 O 3 and SiO 2 . Addition of the amorphous complex…
Abstract The structural changes during enzymatic hydrolysis of cellulose substrates were studied by SAXS, WAXS, water retention values, and degree of polymerization. LODP cellulose samples in original (cellulose I) and mercerized (cellulose II) form were hydrolyzed using a commercial cellulase preparation produced by…
Abstract Background removal from x‐ray photoelectron spectra (XPS) was evaluated using the Shirley method and the Tougaard method. The effect of background removal over a range of kinetic energy was evaluated, and the Tougaard method was found to be effective over a wide energy range. In this paper we report a modific…
Porous silicon structures are formed by electrochemical etching of silicon in HF solutions. The selective dissolution of silicon results in the formation of a porous structure with a characteristic morphology dependent on the dopant type and concentration, the applied voltage, and the electrolyte composition. The phys…
Blue phases (BP's) in liquid-crystalline systems of high chirality exhibiting a short cholesteric temperature interval are investigated. In a BP I supercooled with respect to the cholesteric phase, the orientation of the cubic lattice with the (1,1,0) wave vector perpendicular to the substrate is spontaneously turned…
Abstract Acid-catalyzed Friedel–Crafts alkylation reactions of p-methylbenzyl chloride with benzene were carried out on four unmodified natural clay minerals. Phenyl-p-tolymethane was quickly and selectively formed in the presence of vermiculite. Although the specific surface area of vermiculite is smaller than those…
Kinetic effects such as coarsening and back diffusion affect the solidification rate and hence the rate at which latent heat of fusion is liberated. Neglecting these effects can bring about errors in macroscopic heat flow simulation. The paper investigates whether these errors are large enough to necessitate interacti…
Abstract The compatibility and crystallization behavior of blends of semicrystalline and amorphous polymers, traditionally used as matrices of high performance composites, has been studied. The analysis has been focused on blends of semicrystalline poly(etheretherketone) (PEEK) with amorphous poly(etherimide) (PEI) pr…