Materials Literature
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It has been demonstrated that the natural atmospheric corrosion behavior of low alloy steels in marine environments can be accurately described by an equation of the form: ∆W = KtN. With this relationship, reliable predictions of long term weight losses can be made from as few as two sets of determinations obtained in…
Abstract The polymers of lithium, sodium, potassium, and caesium salts of methacrylic acid have been prepared by free radical polymerization of the respective monomers in methanol solution. The degradation behavior of the polymers has been investigated by thermal volatilization analysis, thermogravimetry, and product…
Abstract A technique suitable for computer application has been developed whereby whole rock major element analyses are corrected for X-ray detectable nonclay minerals and used to set up simultaneous equations which are solved to give clay mineral abundances. A theoretical evaluation of the approach by graphical metho…
Gas-gun impact techniques have been used to pulse charge nanofarad capacitors from the shock depoling of PZT 56/44 and PZT 95/5 ferroelectric ceramics. The PZT materials were depoled in the normal mode. Pulse powers of hundreds of kilowatts were produced in a few microseconds. The PZT 56/44 material was impacted in th…
The characteristic pitting potentials of Ti and Ti6Al4V were determined by measurement of potentiodynamic current-potential curves in solutions of 1N NaCl, 1N Nal, and 1N NaBr. Under the same conditions current-time curves were measured for various potentials after generation of a new metallic surface. By means of the…
Air travel is becoming increasingly more accessible to people both\nthrough the availability of low cost flights. Health problems may arise due to anxiety\nand unfamiliarity with airport departure procedures prior to flying, whilst\nduring the air travel, problems may arise as a result of the food served on board,\ndi…
Abstract Besides the well-known argyrodite (Ag 8 GeS 6 ), the new compound Ag 2 GeS 3 could be synthesized from Ag 2 S-GeS 2 mixtures. Ag 2 GeS 3 crystallizes in an orthorhombic variant of the Wurtzite structure. Treatment of Ag 2 GeS 3 in a AgI/AgCl-eutectic yields the quaternary compound Ag 7 GeS 5 I. Crystal data f…
Heating experiments on natural omphacite at 15 to 18 kbar, using a piston-cylinder solid-media apparatus, have established the critical temperature for the order-disorder P2/n = C2/c transition at 725 plus or minus 20 degrees C. The disordering reaction P2/n-C2/c is quite abrupt, and the observed transformation temper…
The corrosion growth kinetics for Cu, Ni, and Ag in an air‐conditioned telephone office and a nonair‐conditioned telephone office basement have been obtained by measuring the film thicknesses on coupons exposed for various times. The film constituents and thicknesses on these materials were obtained by AES and cathodi…
At certain wavelengths, depending on the thickness of a thin transparent dielectric layer on an absorbing substrate, a standing-wave condition can be produced that efficiently couples the S wave to the substrate, simulating a cavity resonance in the dielectric and maximizing the complex reflectance ratio. Under these…
Abstract From the general formalism of elastic x‐ray scattering and a few meaningful assumptions we have shown that for an atom, ∫ρ 2 d τ is an experimentally measurable quantity related to the intensity scattered by an element. We have labeled this quantity ( p ), the “average electron density.” If ψ obeys the virial…
Viscosity and thermal expansion have been measured for 12 series of lithium aluminosilicate glasses. The compositional dependency of the viscosity, glass-transformation temperature, dilatometric-softening temperature, and refractive index all exhibit an abrupt change in slope at an aluminum-to-lithium ratio between 1.…
The anodic behavior of copper in lithium hydroxide solution was investigated at room temperature under controlled potential conditions. The electrodes were either saturated copper amalgams or small polycrystalline wires. Particular attention was focused on the copper (I) region. Two layer‐planes of Cu 2 O were formed…
The nacreous layer in Gibbula, Calliostoma, Trochus and Haliotis is described on the basis of scanning electron microscopic studies. The central part of each nacreous tablet contains a significant amount of calcified organic matrix which is insoluble in a chromium sulphate and a 25% glutaraldehyde solution. In most ca…
Abstract Nonempirical LCAO MO SCF computations (in the ΔSCF formalism) have been carried out of binding energies and relaxation energies for an extensive series of oxygen‐containing organic systems encompassing most of the common functionalities. The molecules for which experimental data are available for comparison d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron paramagnetic resonance of low-spin cobalt(II) complexes: effect of axial ligation upon the ground stateAbbas Pezeshk, Frederick T. Greenaway, and Gershon VincowCite this: Inorg. Chem. 1978, 17, 12, 3421–3425Publication Date (Print):December 1, 1978Publication Histor…
The corrosion rates of low alloy steel and carbon steel in 0.1 N NaCl were accelerated by factors of 4 to 6 when an alternating current density of 30 mA/cm2 (60 cps) was applied in dilute salt solutions purged with nitrogen. Tests with low frequency alternating anodic and cathodic current showed that both steels polar…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of binuclear .mu.-peroxo and .mu.-superoxo cobalt(III) amine complexes from Raman spectroscopyColin G. Barraclough, Geoffrey A. Lawrance, and Peter A. LayCite this: Inorg. Chem. 1978, 17, 12, 3317–3322Publication Date (Print):December 1, 1978Publication Hist…
Abstract α,β,γ,δ-Tetraphenylporphinatoaluminium methoxide reacts reversibly with carbon dioxide in the presence of 1-methylimidazole, and this carbon dioxide is activated to react with propylene oxide to produce propylene carbonate under atmospheric pressure and at room temperature.
Chromium chrysoberyl undergoes a phase transformation from a paramagnetic state to a complex antiferromagnetic state at 28 K. The spiral spin structure of the antiferromagnetic state violates all the crystallographic symmetry elements, making Cr2BeO4 potentially ferroelectric. Chynoweth experiments conducted at low te…