The Cathodoluminescence Spectra and Coordination of Mn2+, Fe3+, and Cr3+ in βLiAl[sub 5]O[sub 8]
Abstract not Available.
Materials Literature
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A Kinetic Study on Deoxidation of Steel
Single and coop erative deoxidations with Mn , Si, and Al are /Jractised in iron baths melted by high-frequency Jurnace and T ammann Jurnace. K inetics oj deoxidation -jnocess are analysed to evaluate the sel){lration-rate oj p rimary inclusions. T he results oj experiments are summarized as Jo llows :
THERMAL TRANSITION OF LEUCITE
The thermal transition of leucite was studied. The specimens were from Nyiragongo, the Congo and from Vesuvius, Italy, and X-ray powder and single crystal diffraction experiments were carried out from room temperature up to 800°C. At room temperature, the crystal, single and cubic in appearance, is composed of six she…
Thermal rearrangement of diphenyl carbonate
The thermal degradation of diphenyl carbonate has been examined in the gas and condensed phases. From a detailed analysis of the products it is suggested that the mechanism involves an initial rearrangement to 2-phenoxy benzoic acid followed by several competing reactions of the acid. The effect of phase is discussed.…
Infra-red study of adsorption and oxidation of ammonia on silica-supported platinum and silica
An infra-red study of the adsorption of ammonia on silica-supported platinum in the region 3600-1900 cm–1 over a temperature range 25–130°C yields four spectral features: a strong broad absorption at 2960 cm–1 due to the perturbed ν(OH ···) in a surface SiOH ··· NH3 complex, a shoulder at 3280 cm–1 and two fairly shar…
Thermochemistry of Oxidation Reactions
The following heats of formation (kcal. per mole) have been calculated, MeO, +3.5; EtO, -4.0, tert-BuO, -21.6; and tert-BuO 2, 18.6. From the radical heats of formation, the following bond strengths (kcal. per mole) were obtained: RO—H, 104 ±1; R—OH, 91.5 ±1; R—OMe, 81 ±1; R—O, 89 ±1; R—O 2 R, 69 ±1; and R—O 2, 26 ±1,…
Structure and reactivity of transition-metal complexes with polyatomic ligands. Part VI. Electron spin resonance and electronic absorption spectra of some chromium(I) nitrosyl complexes
E.s.r. spectra have been recorded for the ions [Cr(NO)(H2O)5]2+ and [Cr(NO)(NH3)5]2+ in dilute fluid and rigid solution. The g and A(53Cr) tensors have been calculation for both ions and the A(14N) tensor for the former. Superhyperfine structure was observed in fluid solutions of [Cr(NO)(NH3)5]2+ from Aiso(14N) for th…
Effect of Metallographical Factors on the Rolling Fatigue Life of Ball Bearing Steel
Effect of metallographical factors on the rolling fatigue life of 1%C-1.5%Cr bearing steel was investigated, and the most profitable component for the bearing life was discussed.The results obtained are as follows:(1) Metallographical factors affected on the rolling fatigue life of bearing steel were not amount and si…
The Effect of Aqueous Salt Solutions on the Melting of Collagen and the Viscosity of Gelatin
Measurements of shrinkage temperatures (TS) for fibrous collagen, of equilibrium degree of swelling (v−1) for the same in the amorphous state, and of intrinsic viscosity ([η]) for randomly coiled gelatin are reported. The data were obtained for a large variety of salts which are typical representatives of lyotropic se…
Dislocation Mobility in the {1122} 〈1123〉 Slip System of Zinc Single Crystals
Abstract Results are presented of measurements of the stress dependence of screw dislocation velocities in the {11 2 2} 〈11 2 3〉 slip system (pyramidal slip) of zinc single crystals. The investigations have been carried out on zinc single crystals of 99.999% purity at room temperature. The dislocation mobility has bee…
Information on Anodic Oxides on Valve Metals: Oxide Growth at Constant Rate of Voltage Increase
The formation of nonporous anodic oxide films is treated mathematically for the constant rate of voltage increase method to provide a basis for interpreting reanodization current‐voltage curves. Illustrative reanodization I–V curves are considered for such initial anodic oxide films as nonporous oxide, porous , plasti…
Topochemistry. Part XXVIII. The system: 4-chloro-N-salicylideneaniline—4-bromo-N-salicylideneaniline
4-Chloro- and 4-bromo-N-salicylideneaniline form two series of solid solutions, each of which spans the whole range of composition. One series is based on the structure of the stable crystalline modification of the bromocompound and these solutions are photochromic, non-thermochromic, and non-luminescent (type α). The…
Thermal decomposition of aromatic and heteroaromatic amino-acids
G. P. Shulman and P. G. Simmonds, Chem. Commun. (London), 1968, 1040 DOI: 10.1039/C19680001040
Oxides of Nitrogen from Gas Turbines
Experimental and theoretical studies were made to provide information on nitrogen oxide concentrations produced by gas turbine engines. Nitric oxide concentrations of from 100 to 350 ppm, adjusted to stoichiometric conditions, were measured in aircraft turbojet engines. Concentrations of less than 50 ppm, similarly ad…
An X‐ray study of cellulose triacetate
Abstract Cellulose triacetate I is yielded from cellulose II of mercerized cellulose and rayons in heterogeneous acetylation with lower swelling pretreatment. Both cellulose triacetates I and II with highly ordered structure substantially are converted into cellulose II on saponification. It is possible to obtain tran…
The Mössbauer effect in tin( II ) compounds, part III. The spectra of trihydroxostannates( II ) and of basic tin( II ) salts
The Mössbauer parameters of a number of trihydroxostannates(II) and their decomposition products and of some basic tin(II) salts are reported and discussed in terms of the tin species likely to be present in these materials.
Nitrosodisulphonates. Part I. Fremy's salt (potassium nitrosodisulphonate)
Solid potassium nitrosodisulphonate (Fremy's Salt) is shown to exist in two distinct crystalline forms. An improved preparation, and crystallisation methods for both forms are given. Stability of both solids and solution is discussed in detail. The forms are compared in terms of their i.r. spectra, magnetic properties…
Gittergeometrische Betrachtung der plastischen Verformung von Lavesphasen
Abstract Die Sprödigkeit vieler intermetallischer Verbindungen auch bei metallischem Bindungscharakter läßt einen Zusammenhang mit der Gittergeometrie vermuten. Der Einfluß der Atomanordnung auf das Gleiten der Versetzungen wird für die Lavesphasengitter des MgZn 2 ‐Typs (C 14) und des MgCu 2 ‐Typs (C 15) vergleichend…
A mass spectrometric study of the BeO-BeF2 system at high temperatures
, was computed using the reaction enthalpy based on the second law.
Le téréphthalate de di(tétraméthyl-2,2,6,6 pipéridinyl-4 oxyle-1) est-il un biradical à échange fort ou à échange faible?
La comparaison des intensités de signaux de résonance paramagnétique électronique de solutions de biradicaux à échange interélectronique faible, fort ou intermédiaire, montre que le téréphthalate est un biradical à échange faible.