Materials Literature
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Physical and chemical information on zinc corrosion layer formation, evolution, morphology, and chemical makeup is organized and presented, together with information on minerals containing zinc and other crystalline structures that might be expected to be present. The chemical reactions involved in the formation of th…
Electrochemical impedance results are presented for 550 day exposures of organic‐coated carbon steel samples. Coatings consisted of translucent pigmented and unpigmented epoxy and conventional opaque epoxy polyamide systems. Coating thicknesses ranged from 20 to 185 μm. Specimens were exposed under freely corroding co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamic dilution and the viscosity of star-polymer meltsR. C. Ball and T. C. B. McLeishCite this: Macromolecules 1989, 22, 4, 1911–1913Publication Date (Print):April 1, 1989Publication History Published online1 May 2002Published inissue 1 April 1989https://pubs.acs.org/doi/1…
Calculations of the nonlinear-optical behavior are developed for model composites of nanospheres with a metallic core and nonlinear shell or with a nonlinear core and metallic shell suspended in a nonlinear medium. Optical phase conjugation is shown to be enhanced from each nonlinear region because the optical field c…
The blue phases of cholesteric liquid crystals are liquids that exhibit orientational order characterized by crystallographic space-group symmetries. We present here a pedagogical introduction to the current understanding of the equilibrium structure of these phases accompanied by a general overview of major experimen…
The optical spectra of the lanthanides doped into single crystal LaF3 have been interpreted in terms of transitions within 4f N configurations. Energy matrices combining free-ion terms with a crystal field for an approximate model which assumes C2v instead of the actual C2 site symmetry were diagonalized. Excellent co…
The results obtained from studying the reactions of N-chloramines, N-halocarbamates, and N-haloamides of carboxylic, sulphonic, and phosphoric acids with unsaturated compounds have been correlated and classified. It is shown that the direction of addition of N-haloamines and N-haloamides to alkenes, dienes, alkenynes,…
Low-energy excitations between charge-density-wave metastable states are revealed in low-temperature specific-heat measurements in quasi-one-dimensional materials as an excess contribution (to the lattice one) following a ${\mathrm{C}}_{\mathrm{p}}$=${\mathrm{T}}^{\ensuremath{\nu}}$ law with \ensuremath{\nu}<1. In…
A new reconstruction structure, having a \ensuremath{\surd}3\ifmmode\times\else\texttimes\fi{}\ensuremath{\surd}3)R30\ifmmode^\circ\else\textdegree\fi{} unit cell, is reported for the Si(111) surface. Analysis of low-energy electron-diffraction intensity spectra by multiple-scattering theory revealed a vacancy model.…
We have measured the full spectrum of the third-order optical susceptibiltiy, ${\ensuremath{\chi}}^{(3)}$(\ensuremath{\omega}), in polyacetylene using an infrared free-electron laser. The magnitude of ${\ensuremath{\chi}}^{(3)}$(\ensuremath{\omega}) reaches \ensuremath{\sim}${10}^{\mathrm{\ensuremath{-}}8}$ esu at 0.6…
High-resolution, small-angle, synchrotron x-ray-scattering techniques were used to determine the phase diagram, structure factor, and pair distribution function for a charged colloidal suspension from 6% to 30% volume fraction. The expected correlated liquid and fcc and bcc solid phases were observed along with a glas…
Abstract are prepared by solid state reactions and their structures are studied (XRD).
The formation of the liquid, crystalline and glassy states in binary mixtures of aqueous suspensions of charged polystyrene spheres of different sizes is investigated using molecular dynamics simulations. It is shown that on merely mixing the particles, crystalline (a substitutional body-centered cubic) and glassy sta…
Recently, there has been a great deal of interest in Na2S⋅9H2O as a passivating chemical treatment for GaAs surfaces. It has been shown that it reduces the high surface recombination velocity characteristic of GaAs surfaces, and may offer hope for ‘‘unpinning’’ the surface Fermi level. We have used photoemission spect…
The nature of the 2.7-eV photoluminescence in as-manufactured oxygen-deficient high-purity silica glasses is studied. Luminescence lifetime measurements and ab initio molecular-orbital calculations are consistent with the luminescence being a triplet-to-ground transition of a neutral oxygen-vacancy defect (?Si-Si?).
The related micromagnetic techniques of Barkhausen emission (BE) and magneto-acoustic emission (MAE) are used to study neutron damage effects in α-iron and iron—copper alloys following irradiation to 2.4 to 2.9 × 1019 n cm−2 (> 1 MeV) at 60 and 290 °C, respectively. The role of initial heat treatment and thermal agein…
Polarized Raman spectra of LaNbO4 which is known to show a peculiar behavior of state shift in the ferroelastic phase are measured. All the observed bands are assigned. Raman spectra measurements are made on a newly extended region of a domain under an external stress at 90 K. The results reveal that the difference in…
C20H20O4S, Mr = 356.4, monoclinic, P2(1)/c, a = 5.045 (3), b = 29.115 (7), c = 11.924 (2) A, beta = 94.82 (3) degrees, V = 1745.2 A3, Z = 4, Dx = 1.357 g cm-3, lambda(Cu K alpha) = 1.5418 A, mu = 17.86 cm-1, F(000) = 752, T = 298 K, R = 0.038, wR = 0.044 for 1212 reflections, I greater than 3 sigma(I). In the crystal,…
The photoluminescence of several natural and synthetic diamonds of type I and type II has been examined in the spectral range 1.35--1.85 eV (920--670 nm) at 300 and 79 K at ambient pressure. Two emission bands with zero-phonon lines at 1.575 and 1.770 eV are observed in all yellow type-Ia natural diamonds. These bands…
The spectral dependence of the infrared absorption cross section of As in Si near 0 K has been determined from infrared transmission measurements for three As concentrations (5.3, 8.4, and 15.9 x 10(17) cm(-3)) in the impurity band regime. The results demonstrate some features of physical interest. With increasing As…