Materials Literature
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Porous anodic alumina films grown in sulfuric acid and similar specimens sealed in nickel acetate and dichromate sealing baths were subjected to a number of surface and bulk analytical techniques (XPS, RBS, SIMS, and XRD). All the oxide films were found to be amorphous‐like in nature, to contain significant amounts of…
The thickness of gold thin films of 0.1–100 nm on Si substrates has been measured with an electron probe microanalyzer. The analysis process is as follows. k ratio versus thickness calibration curves are produced through use of a Monte Carlo simulation of electron scattering based on the Mott cross sections for elasti…
Mineralogical and geochemical analyses of alteration products from upper and lower volcanic series recovered dur ing ODP Leg 104 reveal variations both in composition and order of crystallization of clay minerals vesicles and voids filling and replacing glass. These results provide information about successive alterat…
Several new structures are proposed as tests of a general model for the design of ferromagnetic polymers.
Abstract It can be shown both theoretically and experimentally that calcium carbonate forms during the titration of polycarboxylates by calcium with carbonate as the indicator, and that the calcium carbonate is dispersed by the polycarboxylate. If the dispersing capacity of the polymer exceeds the level of calcium car…
The colourless compounds Li 3 OBr and Li 7 O 2 Br 3 have been prepared and characterized by X-ray diffraction techniques. Li 3 OBr crystallizes in a cubic primitive lattice (Pm3m) with a = 405.6(1) pm (Z = 1). The structure is related to the anti-perovskite type. Li 7 O 2 Br 3 crystallizes in a tetragonal bodycentered…
An experimental study is reported of solidification of ammonium chloride-water solutions inside a rectangular enclosure. The phase-change and convection processes are studied through shadowgraph and flow visualization as well as temperature and concentration measurements. A number of different initial and boundary con…
Abstract The optical properties of polyetherimide resin as described by the complex index of refraction, N = n ‐ ik, are derived by Kramers‐Kronig analysis of experimental absorption and reflectance data obtained in the range 40 μm ≥ λ ≥105 nm. Potential uses of this polymer as a printed circuit board material and as…
A simulation study is presented using a new version of the simulation program ADEPT (advanced simulation of dry-etching process technology), which is a subset of the process simulator COMPOSITE. Based on some aspects of plasma physics, a model was developed that allows for the calculation of important properties of a…
Tungstic oxide film is prepared from a W metal target by the rf sputtering method and its electrochromic characteristics are compared with that from WO3 target. Maximum coloration efficiency found for both kinds of films are equal and about 0.06 cm2 /mC at the wavelength of 600 nm, which is higher than that of typical…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural, spectroscopic and theoretical studies of novel d6 fac-bromotricarbonyl(dithiooxamide)rhenium complexesPeter C. Servaas, Derk J. Stufkens, Ad Oskam, Pieter Vernooijs, Evert Jan Baerends, Dirk J. A. De Ridder, and Caspar H. StamCite this: Inorg. Chem. 1989, 28, 22,…
Abstract Tetradesmethyl‐β‐carotene is found to form aggregates in a mixed solvent of methylcyclohexane and isopentane at temperatures below 180 K. The absorption band around 470 nm (0–0 transition) of the monomer splits into a pair of absorptions (exciton bands) on aggregation, one around 400 nm and the other around 5…
Arsenic deposition onto a gold substrate was studied as a function of p H, deposition potential, and time. Deposition of less than three monolayers was observed. The rate of deposition decreased as the thickness of the deposit increased. A set of partial reactions leading to arsenic deposition was proposed. The kineti…
A mathematical model has been evolved to estimate the breaking elongation of highly twisted (3 < TM < 6) singles ring spun cotton yams from fiber characteristics. Results show that the accuracy of estimation of the proposed model is very high. The model is applicable to both carded and combed cottons.
The sweet corrosion behavior of L-80 grade downhole tubular was investigated in flowing two-phase oil-brine fluids. Depending upon percent water cut, two different phases appeared to exist: a water-continuous phase above 50% water cut and an oil-continuous phase below 50% water cut. In the oil-continuous phase, the pr…
Results of electric conductivity, permittivity and spontaneous polarization measurements for PbTiO3 single crystals with La doping up to 0.44 at % are presented. Marked influence of lanthanum doping on dielectric parameters such as permittivity and Curie temperature has been found. Considerable changes of d.c. conduct…
The adsorption of pyrene-end-labeled poly(ethy1ene glycol) (Py-PEG-Py) onto aqueous colloidal polystyrene (PS) particles is investigated by photostationary fluorescence, fluorescence decay, and photostationary fluorescence depolarization experiments. All of the spectroscopic observations on this system suggest the ass…
The formation of the icosahedral quasicrystalline phase in the Al-Cr-Fe system has been investigated by X-ray diffraction as a function of the CrxFe1–x, composition of the transition-metal (TM) quasisublattice. An optimal range was found around x = 0·6, where the icosahedral phase shows the highest degree of structura…
This article introduces an unconventional electron optical probe forming system which is particularly suitable for low beam voltages and very large specimens, such as semiconductor wafers which also require a large angle tilting. The system can produce an electron probe of less than 20 Å for a nontilting specimen at 1…
Abstract Single crystals of β 1 and polycrystals of β 2 of POP and SOS were obtained from acetonitrile solution. The crystallization behavior of the two polymorphs was almost the same in POP and SOS; rapid cooling of the solution preferentially crystallized the metastable β 2 form, and the most stable β 1 form crystal…