Materials Literature
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High‐purity aluminum sheet was anodized in eleven different acidic electrolytes: boric, chromic, phosphoric, sulfuric, oxalic, malonic, succinic, tartaric, fumaric, glutaric, and adipic acids. These anodic coatings were analyzed by infrared to determine the composition and nature of each. We found, aside from alumina…
Very pure monoclinic prepared from recrystallized zirconium oxy‐chloride and activated with 0.08% Ti 4+ responds well to 2537Aå and cathode‐ray excitation. A room temperature quantum efficiency of 70%, relative to , has been attained with 2537Aå excitation. The emission band extends from below 4000 to above 6500Aå, pe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Thermal Degradation Mechanism of Polystyrene1Leo A. Wall, Sidney Straus, Joseph H. Flynn, Donald McIntyre, and Robert SimhaCite this: J. Phys. Chem. 1966, 70, 1, 53–62Publication Date (Print):January 1, 1966Publication History Published online1 May 2002Published inissue…
Electric, magnetic, and optical properties of the rocksalt form of titanium monoxide (TiO0.80 to TiO1.25) have been studied. TiO is metallic, exhibiting weak paramagnetism. Properties of TiO-phase samples are determined primarily by the relative concentration of titanium and oxygen atoms and to a lesser extent by samp…
A theoretical expression is presented to relate the effective thermal conductivity of statistically describable two-phase systems to the conductivities of the pure phases, the volume concentrations of the phases, and a shape factor. Auxiliary equations to relate bulk gas conductivity and small interparticle distance a…
It is proved that if two structures differing only in their initial internal stresses are subject to the same loading history, the distributions of internal stress will approach one another in regions of creep and plasticity as the loading proceeds. This theorem is used to prove the existence and uniqueness of steady…
If an intermediate generated on the disc electrode decomposes homogeneously in the solution, then the collection efficiency at the ring electrode will be reduced. This paper examines the effects of such a decomposition which takes place by first-order kinetics. For thin-ring, thin-gap electrodes, two limiting solution…
The transmittance and reflectance of CuO0.67 and CuO films ranging in thickness from 392 to 2335 Å have been measured in the wavelength region of 400 to 800 mμ. These data were used to obtain the wavelength dependence of the optical constants of these materials. Differences between the optical properties of CuO0.67 an…
The behaviour of the magnetic properties for the 3T1g term under simultaneous perturbation by spin–orbit coupling and an asymmetric (trigonal or tetragonal) ligand field is presented. The theory is applied to the variation in the magnetic properties of nineteen nickel(II) tetrahedral complexes over the temperature ran…
The design of mirrors composed of multilayer stacks of dielectric films is considered. High reflectance over an extended spectral range is attained by positioning the stacks so that on a wavelength scale their high-reflectance bands are either contiguous or overlapping. Certain precautions must be taken in the choice…
Measurements of the temperature dependence of the Hall coefficient are presented for samples of p-type PbTe having carrier concentrations between 3×1017 and 1×1020 cm−3. As the temperature increases, the Hall coefficient for any given carrier concentration at first remains at the constant value RL and then increases s…
The initial load-extension modulus of a cloth is analyzed and is shown to depend not only on the bending modutus of the yarn and the geometry it takes up in the cloth, but also on the history of the fabric. It is found that fabrics which still retain their stressed condition, which arose when the cloth was made, have…
Abstract The E.P.R.‐spectra of zone‐refined V 2 O 5 are interpreted in terms of a defect centre consisting of an unpaired electron interacting with two equivalent vanadium nuclei separated by an oxygen vacancy. This conception leads to the establishment of a defect formula for V 2 O 5 , involving V 4+ and V 3+ ions. A…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransition Metal Complexes Containing 1,1-Dicyanoethylene-2,2-dithiolateBeatrice G. Werden, E. Billig, and Harry B. GrayCite this: Inorg. Chem. 1966, 5, 1, 78–81Publication Date (Print):January 1, 1966Publication History Published online1 May 2002Published inissue 1 January…
Chemical bonding, a requirement for adherence, is developed at glass‐metal interfaces by achieving and maintaining equilibrium compositions at the interfaces. Reactions between iron and glasses with and without “adherence oxides” were studied by thermogravimetry, optical microscopy, and electron probe microanalysis. A…
When catalytic aluminas are heated to a high temperature, sites are produced on the surface which are capable, at room temperature, of oxidizing polynuclear aromatic hydrocarbons to the corresponding ion-radical, provided oxygen is present. The oxidizing activity depends markedly on the conditions of activation. Fully…
Abstract This note suggests a possible origin of low energy tails observed in radiative recombination when at least one of the participating bands is degenerate. An order‐of‐magnitude calculation is made which shows that the effect can have the same origin as similar effects in the soft X‐ray emission spectra of metal…
A detailed investigation of different methods for determining electron trap parameters has been made on crystals of CdS-CdSe. The principal techniques involved are decay of photoconductivity and thermally stimulated conductivity (TSC). Direct evidence of a quasicontinuous trap distribution with total density of 5×1015…
A study has been made of the adsorption of homogeneous non-ionic detergents from aqueous solution on Graphon. At a fixed temperature maximum adsorption increases with increasing alkyl chain length and diminishes with increasing size of the hydrophilic head group. In contrast to the behaviour normally observed for the…
Abstract Nach dem „Sprühverfahren”︁ wurden n‐leitende Indiumoxydschichten mit Schichtdicken zwischen 0,1, und 0,5 μm auf Glasplatten hergestellt und die Herstellungsbedingungen dieser Schichten untersucht. Die Leitfähigkeit der Schichten liegt je nach Dotierung zwischen 1,5 × 10 2 und 4,3 × 10 3 Ω −1 cm −1 und die Kon…