Materials Literature
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Surface textures resulting from the anodic dissolution of polycrystalline and single crystal copper at have been studied. Electrolyte flow velocities of 2500 and 400 cm/sec have been used for dissolution in the active and transpassive mode. Results obtained by light and electron microscopy show that surface topography…
The surface features and dislocation substructures present in copper single crystals subjected to slow cyclic plastic shear strains of ± 1% are reported and discussed. Thin-film electron microscopy has revealed that at no time during the hardening stage are dislocations grouped into a uniform, three-dimensional cell s…
A binuclear nitrous oxide complex, [Ru-(NH3)5)2N2O](BF4)4, has been isolated from the reaction between aquopenta-ammineruthenium(II) and N2O (at 1 atm.).
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural studies of magnesium halide-potassium halide melts by Raman spectroscopyVictor A. Maroni, Ellen J. Hathaway, and Elton J. CairnsCite this: J. Phys. Chem. 1971, 75, 1, 155–159Publication Date (Print):January 1, 1971Publication History Published online1 May 2002Publ…
The adsorption of hydrogen chloride on outgassed, deuterated, and reduced rutile surfaces has been studied by infra-red spectroscopy. Surface Ti4+O2–Ti4+ groups react with hydrogen chloride to form hydroxide ions and chloride ions on adjacent titanium ion sites. The reaction of hydrogen chloride with surface hydroxide…
A new investigation of the magnetic structure of DyCrO3 by means of neutron diffraction is described. The Dy moment arrangement as reported by Bertaut and Mareschal has to be modified. No mixing of G and A modes along one crystallographic axis is observed which means that one type of interaction, though allowed by sym…
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ClMn(CO)5 crystallises in space group Pnma, a= 11·54(2), b= 11·52(2), c= 5·95(1)Å, Z= 4. The crystal structure has been determined by a three-dimensional X-ray analysis based on 653 non-zero reflections measured by counter diffractometry. Refinement by block-diagonal least-squares methods with individual anisotropic t…
A kinetic and mechanistic study of the oxidation of methane over palladium and palladium oxide catalysts has been carried out in a pulse flow micro-reactor. The system used was designed especially for the identification of unstable intermediates, but only trace quantities of formaldehyde, carbon monoxide and hydrogen…
Abstract Linear organosiloxanes with various substituents differ in their spreading velocities and with respect to the film structure formed on aqueous substrates. The material investigated allows a distinction between siloxanes in which the molecules placed on the subphase in helical form become oriented on the surfa…
The theoretical behaviour of principal and average magnetic moments of octahedral cobalt(II) complexes perturbed by spin–orbit coupling and a D3d symmetry crystal-field distortion is presented. Calculations were performed using a complete spin–quartet basis and the crystal-field parameterized by second- and fourth-ord…
The sulfldation kinetics of a Ni‐20 w/o (weight per cent) Cr alloy exposed to hydrogen sulfide‐hydrogen atmospheres at 700°C have been determined as a function of the sulfur pressure. The morphology and phase composition of the duplex sulfide scale formed as a corrosion product have been investigated. The kinetics app…
Abstract A folded chain model of cellulose fine structure has been developed, together with a new hypothesis on cellulose “weak links”. Essentially, single cellulose molecules are folded back and forth in the (101) plane to form “platellites” which are the smallest physical and structural unit of crystalline cellulose…
Optical second-harmonic generation coefficients have been measured for several organic molecular crystals. Variations in coefficients for related compounds can be correlated with differences in molecular structure. Highly polarizable aromatic molecules with substituent groups arranged to produce a large static polariz…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Prediction of Surface Tensions of Liquid PolymersL. S. Siow and D. PattersonCite this: Macromolecules 1971, 4, 1, 26–30Publication Date (Print):January 1, 1971Publication History Published online1 May 2002Published inissue 1 January 1971https://pubs.acs.org/doi/10.1021/m…
In order to make clear the precipitation processes in Cu–Be alloy, the structural changes upon ageing of the 2 wt% Be alloy were examined in detail through an electron microscopy in particular by the use of the selected-area electron diffraction technique. The change in electron diffraction patterns with increasing ag…
An outline of the forces involved in clay particle interaction (swelling and dispersion) is given as a background for the interpretation of the physical behaviour of sodic soils, especially in relation to electrolyte levels. The electrolyte concentration below which appreciable decreases in soil permeability are encou…
The influence of manganese, silicon, chromium and nickel on the solubility of niobium carbide in iron austenite have been studied on iron austenites containing various quantities of these elements with niobium by the method of equilibration with methane-hydrogen mixture gas. Manganese and chromium increased the solubi…
The rate of recombination of hydrogen atoms in fuel-rich hydrogen/oxygen/nitrogen flames containing metal additives has been measured using the lithium/lithium hydroxide method to monitor hydrogen atom concentrations. It is found that the rate of the recombination reaction is accelerated by the addition of alkaline ea…
Abstract Seven samples of montmorillonite from Belle Fourche, South Dakota and one from Clay Spur, Wyoming were equilibrated with various solutions for 3 to 4 years. Most samples did not exhibit a static equilibrium, yet solution compositions moved along or toward definite solubility lines in relation to pH‐⅓ pAl 3+ v…