Materials Literature
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Abstract The theory of MCSCF and CI energy derivatives with respect to geometrical variations is briefly reviewed with special attention given to the MCSCF and MRCI energy gradients. A computational procedure is proposed for MRCI energy gradients that does not require the solution to any “coupled‐perturbed MCSCF ” equ…
The catalytic properties of some mixed zirconates with the pyrochlore or fluorite structure have been investigated using CO oxidation as the test reaction. The presence of terbium ions, leading to mixed conductivity, and the extent of pyrochlore ordering affect the kinetic behaviour and the catalytic activity of the i…
Metal-free and copper(II) 1,4,8,11,15,18,22,25-octa-alkyl phthalocyanines have been prepared with alkyl chain lengths between C4 and C10; all except those with C4 and C5 chains show thermotropic liquid crystalline behaviour with one or more mesophases.
A model is presented that determines the effect of oxygen and helium on the energies of the common vacancy-cluster configurations, namely the void, dislocation loop and stacking-fault tetrahedron. Representative calculations are given for the case of irradiated copper. The presence of oxygen tends to enhance the stabi…
The synthesis, colour, and constitution of methine dyes formed by condensation of benzaldehydes and nitrosobenzenes with dicyanovinyl analogues of indane-1,3-dione have been investigated. 3-Dicyanovinylindan-1-one (3) and 1,3-bisdicyanovinylindane (5) give magenta (λmax.ca. 560 nm) and blue (λmax.ca. 600 nm) dyes resp…
This work reviews and discusses the data on the various thermodynamic properties of manganese and molybdenum available through March 1985. These include heat capacity, enthalpy, enthalpy of transitions and melting, vapor pressure, and enthalpy of vaporization. The existing data have been critically evaluated and analy…
Summary Experimental deformation of water-rich argillaceous sediments has shown that they deform not by pervasive homogeneous flow, as has sometimes been surmised in the past, but by intense slippage within very narrow, discrete zones of shear. These shear zones enable large total strains to be accomplished whilst lea…
Tests were performed to evaluate the effects of crystallinity on the mechanical properties of PEEK 150P polymer and APC-2 graphite/PEEK composite. The tensile strengths, ten sile moduli and fracture toughnesses of the polymer, and the mixed mode I and mode II fracture toughnesses of the composite were measured at crys…
The phonon dispersion relations of ThO2 and CeO2 have been measured in the three principal crystallographic directions at 293 K using inelastic neutron scattering. After correction for instrumental resolution effects, the data were fitted by rigid ion and shell models of the interionic forces, and the corresponding pa…
SUMMARY The crystallinity of six cellulose samples with different origin and treatment was determined using x-ray diffraction (XDR) and nuclear magnetic resonance with cross polarization and magic angle sample spinning (CP/MAS NMR) methods. The numerical results for crystallinity obtained by using curve fitting method…
Test methods currently available for determining the resistance of stainless steels and related alloys to pitting and crevice corrosion in chloride environments are assessed. The present understanding of the mechanisms of pitting and crevice corrosion are examined, and the major factors affecting the processes are not…
X-ray diffraction has been used to determine the temperature of phase transitions and the existing distortions of the pseudoperovskite cells throughout the whole range of concentrations of AgTaxNb1−xO3 solid solutions. From the data obtained a phase diagram was constructed. Also plotted were the temperature dependence…
Abstract The degree of crystallinity of polyetheretherketone (PEEK) has been measured using both the density gradient technique (DGT) and differential scanning calorimetry (DSC). The difference in results between the methods was shown to depend on crystallization taking place during the heating scan in the DSC. By fre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOsmotic pressure of foams and highly concentrated emulsions. 2. Determination from the variation in volume fraction with height in an equilibrated columnH. M. Princen and A. D. KissCite this: Langmuir 1987, 3, 1, 36–41Publication Date (Print):January 1, 1987Publication Histo…
The synthesis of novel bis-porphyrin systems in which the porphyrins are rigidly constrained in a coplanar arrangement is reported.
Measurements are presented of the optical constants of a thin gold film over primarily the visible region of the spectrum using the surface plasmon-polariton resonance condition in the attenuated total-reflection configuration. Using this technique precise results are obtained and these are compared with those found u…
The energies of voids, stacking-fault tetrahedra and vacancy loops in gold, silver, aluminium, copper, nickel, stainless steel, α-iron and molybdenum have been reexamined as a function of cluster size using established elastic continuum expressions. Stacking-fault tetrahedra and vacancy loops are the most stable small…
On etudie des systemes contenant de 0 a 30% de lithium. On mesure la densite, l'indice de refraction, le coefficient de dilatation thermique, la temperature de transition vitreuse, la temperature de cristallisation et la conductivite electrique
This paper presents an extensive literature review and assessment of corrosion failure mechanisms encountered during accelerated tests of microelectronic devices. The failure mechanism of primary emphasis is electrolytic metal migration. The metallurgies of interest are silver, gold, copper, and aluminum. Electrochemi…
The ability of a drop to stick to a solid surface is investigated when the surrounding fluid is in motion. The specific problem analysed consists of a small drop on a planar surface immersed in a second immiscible fluid which is flowing parallel to the solid surface at a constant rate of strain. An expression is obtai…