Materials Literature
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SUMMARY A high‐resolution electron‐microscopic study of sodium β′″‐alumina, a polytype of the more‐widely‐studied sodium β‐ and β″‐alumina, has been undertaken using the 600 kV instrument at Cambridge University. Images revealed the loss of sodium‐containing planes, which had caused crystals to collapse and shear into…
In a previous paper[8] breakdown strengths of c-C4F8/SF6/CO gas mixtures in various proportions were reported for a 30mm rod-sphere gap under ac and impulse voltages. A mixture of 1% c-C4F8 + 59% SF6 + 40% CO exhibited higher dielectric strength than pure SF6 in the pressure range between 350 and 400 kPa. The present…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPerhydroazulenes. 4. 6-tert-Butyl-4-oxoperhydroazulene systemHerbert O. House, Peter C. Gaa, Joseph H. C. Lee, and Don VanDerveerCite this: J. Org. Chem. 1983, 48, 10, 1670–1678Publication Date (Print):May 1, 1983Publication History Published online1 May 2002Published inissu…
The effects of 60 Co gamma radiation on the strength‐related mechanical properties of a borosilicate glass were examined. Although the glass darkened considerably, only a very slight densification was observed after irradiation to levels of 10 8 rads. The strength distributions were not appreciably changed by the irra…
The magnetic susceptibility χ and the electrical resistivity ρ of CrGe and Cr 11 Ge 8 are investigated at temperatures above 4.2 K. The magnetic susceptibility of CrGe exhibits a cusp at about 45 K and shows the T 2 dependence with positive coefficient at low temperatures. This behavior of CrGe, together with the beha…
Thermal conductivities of silicate and borate glasses were determined at 30°C by steady‐state methods. From the experimental data, factors representing the contribution of individual oxides (on a weight‐percent basis) were calculated by the least‐squares method. The experimental thermal conductivities and those calcul…
The infrared and resonance Raman spectra of the two long-lived forms of triphenylformazan and several of its derivatives have been examined. The spectra of unsymmetrically 15 N-labelled derivatives suggest that two tautomers exist for each of the two forms. This observation is confirmed by the spectra of 1-(p-halophen…
Abstract The reflectance spectra of orthorhombic GeSe crystals are studied in the region 0.5 to 12 eV in polarized light with E ∥ a and E ∥ b at 290 K and a Kramers‐Kronig analysis is performed. The thermoreflectance spectra are investigated in the region 1 to 5 eV for E ∥ a and E ∥ b at 300 and 90 K. The energy band…
Abstract The influence of ammonium polyphosphate (APP) and hexabromocyclododecane (HBCD) as flame retardant (FR) on poly(acrylonitrile) (PAN) has been examined. The APP–HBCD system behaves as an intumescent flame retardant (IFR) formulation, APP being the char‐forming agent and HBCD the blowing agent. A negligible gas…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProtein isolates from navy and pinto beans: their uses in macaroni productsAbdelmonem A. Seyam, Orville J. Banasik, and Merlin D. BreenCite this: J. Agric. Food Chem. 1983, 31, 3, 499–502Publication Date (Print):May 1, 1983Publication History Published online1 May 2002Publis…
Under conditions where molecules are forced parallel to the cell surfaces but do not orient themselves along a particular direction, we have observed the unwinding process. The cell thickness dependence of the transition temperature from Sm A to distorted Sm C * or Sm C, T c ( d ), has been obtained. The apparent tilt…
Hall coefficient and resistivity measurements have been made on single-crystal ZnO films prepared by chemical vapor deposition on sapphire substrates from 4.2 K to 300 K. Successive reduction of the film thickness from the surface and the rear (interface to substrate) revealed that there are two regions–a bulk region…
Stress corrosion cracking (SCC) of zirconium Grades 702 (commercially pure zirconium), 704 (a Zr-1.5 Sn alloy), and 705 (a Zr-2.5 Nb alloy) in nitric acid has been studied by constant strain techniques, optical microscopy, scanning electron microscopy, and electrochemical techniques. Zirconium and its alloys, except w…
The ratio weight:volume has been determined for ironwork from four archaeological sites. It is shown how this ratio can be used to determine the presence or absence of metallic iron in a corroded artifact. Experiments show that totally mineralized ironwork generally contains much less chloride than does ironwork retai…
Experiments on initiation of crevice corrosion were carried out on Al specimens in dilute aqueous solutions at ambient temperature. Transient current distributions within crevices were measured by a sectioned electrode technique, and microsampling was used to monitor dissolved aluminum, p H, and [Cl − ] composition ch…
The magnetization of ${\mathrm{Fe}}_{80}{\mathrm{B}}_{20\ensuremath{-}x}{\mathrm{C}}_{x} (0\ensuremath{\le}x\ensuremath{\le}8)$ ferromagnetic metallic glasses has been measured in the temperature range $0<T\ensuremath{\lesssim}180$ K (corresponding to $0<\frac{T}{{T}_{C}}\ensuremath{\lesssim}0.3$) and in magneti…
Theory is discussed for the transverse oscillation of a small circular interface set into a rigid baffle between gas and liquid. The angular resonance frequency is given by (15πT/4ρa3)1/2, in which a is the radius of the interface, T is the interfacial surface tension, and ρ is the density of the liquid. Damping param…
Previous studies on glass formation involving GeO 2 with Bi 2 O 3 , TI 2 O, and PbO were extended by the use of Sb 2 O 3 . Wide areas of glass formation occur in the systems GeO 2 ‐PbO‐Sb 2 O 3 and GeO 2 ‐Bi 2 O 3 ‐Sb 2 O 3 at all but the lowest GeO 2 contents; the region of single‐phase glasses in the system GeO 2 ‐T…
Abstract The Silk fibers of the mulberry ( Bombyx Mori ) were dissolved in a 70% lithium thiocyanate solution. Dissolved silk was regenerated by casting the films from the solution after dialyzing. The films were investigated by infrared (IR) spectroscopy and x‐ray diffraction analysis. It was found that the freshly p…
Depending on the electrode potential an n‐type or a p‐type semiconducting oxide can be present at a Ni electrode surface giving rise respectively, to anodic or cathodic photocurrents under illumination. Impedance measurements show that a solid‐state diffusion process, presumably of protons through the oxide film, domi…