Materials Literature
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Arguments are presented which conclude that the mean density of mobile dislocations in a crystalline solid increases linearly with plastic strain for small strains and decays exponentially for large strains, all at constant stress and low temperatures. The resulting analytic expression combined with the strain-rate eq…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExchange of Deuterium with the Hydroxyl Groups of AluminaJ. L. Carter, P. J. Lucchesi, P. Corneil, D. J. C. Yates, and J. H. SinfeltCite this: J. Phys. Chem. 1965, 69, 9, 3070–3074Publication Date (Print):September 1, 1965Publication History Published online1 May 2002Publish…
The lattice parameters of the orthoferrites RFeO3, where R is one of the trivalent rare earth ions Y,Tb,Dy, Ho,Eu,Tm,Yb, and Lu, are calculated using Cohen's analytical method. The parameters, a and c, vary regularly with the atomic number (or the ionic radius) of R, however the b parameter remains almost constant. (A…
Abstract A chemical method based on potassium fixation was developed for quantitative determination of vermiculite in soils. The cation‐exchange capacity (CEC) of a sample is determined by washing with CaCl 2 and replacement of Ca with MgCl 2 . The sample is then washed with KCl, heated to 110C overnight to dehydrate…
Abstract A negatively-charged cobalt ferrocyanide sol has been prepared ultrasonically subjecting the washed precipitate of cobalt ferrocyanide and distilled water to ultrasonic waves. The amount of dispersion increases with the time of exposure. The sol is rendered more stable in an ultrasonic field in the presence a…
Initial stages of stress corrosion cracking in Types 304 and 304L stainless steel were investigated with optical and electron microscopy techniques. Studies of U-bend samples and electron-transmission quality thin foils revealed that cracks initiated preferentially on the {111} family of planes and that formation of c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAqueous Solubilities of n-Dodecanol, n-Hexadecanol, and n-Octadecanol by a New MethodFrank P. Krause and Willy LangeCite this: J. Phys. Chem. 1965, 69, 9, 3171–3173Publication Date (Print):September 1, 1965Publication History Published online1 May 2002Published inissue 1 Sep…
A study was carried out on the corona discharge rate and energy loss occurring within artificial cavities. An air gap with metallic electrodes was utilized to simulate the ionization sources within a cable. The corona discharge rates, obtained with varying gap spacings under different vapor pressures, showed marked de…
The characteristics of cobalt films of initial purity 99.91% and 99.999% prepared by vacuum evaporation on various substrates were studied. Variables were substrate type (KCl, NaCl, and natural graphite), substrate temperature, vacuum during evaporation, and vacuum cleavage vs cleavage in air. Epitaxial fcc cobalt fil…
Chemistry and physics of the rare earth elements and their compounds are in a rapidly expanding state of development. Many new materials with interesting magnetic properties have recently become available. The potential of lanthanon compounds as magnetic materials in electrical engineering is evaluated by comparing th…
Abstract Vulcanizate properties and processability of ethylene propylene copolymers (EPR) are known to be sensitive to variations in polymer microstructure. A basic understanding of the practical performance of EPR requires a knowledge of this microstructure and means for evaluating it. This study was concerned with d…
Abstract A theory is presented that takes into account the two stages occurring during the crystallization of bulk polymers. The theory assumes that all the crystallization occurs within the spherulites but that the amount of crystallinity at any particular point within a spherulite depends upon the age of that partic…
Abstract A detailed study has been made of the swelling of vulcanizates containing “adhering” and “non-adhering” fillers. The restriction of the swelling of vulcanizates containing “adhering” fillers compared to the swelling of the corresponding pure gum vulcanizate does not take place in solvents with solvent power b…
Dezincification occurs by dissolution of both zinc and copper, followed by redeposition of copper from the oxygen-free cuprous chloride/zinc chloride anolyte. Deposition of copper from such a solution by reduction of Cu+ requires a potentIal below −0·41 V but Cu2+, formed by disproportionation of cuprous chloride, can…
A rotating x-ray camera is described which yields lattice constants of single crystals with a possible error of 0.00007 kX. Measurements of expansion may be made with a precision of 0.00002 kX. The design of the camera permits accurate specimen alignment at any specimen temperature and requires that few corrections be…
Abstract In the present paper our previous results and Manley's results for single crystals of amylose V complexes are confirmed. A reasonable interpretation of electron diffraction patterns from lamellar crystals of the monohydrated complex and of the anhydrous complex is presented. It is concluded that the longer si…
Absorption and emission spectra and mean lifetimes (τm) of the luminescence of tris(2,2′-bipyridine)- and tris(1,10-phenanthroline)ruthenium(II) are reported. For the 2,2′-bipyridine complex, two weak absorption bands occurring at 15 050 and 18 550 cm−1 are assigned, respectively, to the 1A1→3T1 and 1A1→1T1 transition…
Adhesion studies on spherical particles imbedded in elastomers have shown that cohesive failure of the binder phase always precedes dewetting. The latter is a sudden and irreversible process resulting in permanent damage to the system. Cohesive failure manifests itself in the formation of a number of small holes near…
The spatial distribution of magnetic moment disturbance around fifteen different transition metal impurities in iron (Ti, V, Cr, Mn, Co, Ni, Mo, Ru, Rh, Pd, W, Re, Os, Ir and Pt) and around four such impurities in nickel (V, Cr, Mn and Fe) has been investigated. A neutron scattering technique was employed that gives i…
A description is given of investigations concerning the participation of ammonium nitrate in the formation of HMX and RDX by the nitrolysis of hexamethylene tetramine.