Materials Literature
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Stromatoporoid cross‐sectional shape can be considered as a product of the interaction of three morphological variables: the relative proportions of basal, vertical and diagonal dimensions. The gross arrangement of internal lamination can be superimposed upon the resulting outlines. These shapes are taken to represent…
A study is presented of the liquid phase epitaxial growth of the quaternary mixed crystal Al y Ga 1 − y As 1 − x Sb x . Samples were grown over the composition range 0 < x < 0.2 , 0 < y < 0.6 , at temperatures from 785° down to 715°C, below which a miscibility gap in solid composition was observed. With the inclusion…
Abstract The energy distribution curves of the 2p core levels of pure and heavily doped Si are investigated using highly monochromatized (≈︁ 0.1 eV) synchrotron radiation (105 to 140 eV). Shifts and broadenings of the spectra with doping and with the energy of the exciting photons are observed and interpreted in terms…
Abstract The microdeformation morphology of a number of vinyl polymers with bulky side chains (type I) and arylene polymers with flexible oxygen linkages (type II) was studied by electron microscopy. The polyarylenes crazed only near the glass transition while the polyvinyls exhibited a crazing regime that extended to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTManganese(II) porphyrin oxygen carriers. Equilibrium constants for the reaction of dioxygen with para-substituted meso-tetraphenylporphinatomanganese(II) complexesRobert D. Jones, David A. Summerville, and Fred BasoloCite this: J. Am. Chem. Soc. 1978, 100, 14, 4416–4424Publi…
Carrier binding and recombination processes at transition metal (TM) and post-transition metal impurities in solids are reviewed. The presence of low-lying empty core orbitals in these impurities introduces novel binding and recombination phenomena and leads naturally to a classification of impurity centres as ‘simple…
This paper describes a method to improve the electromigration capacity of Al-Cu or Al thin-film interconnection metallurgy by incorporating a layer of intermetallic compounds of Al and transition metals. The improvement in lifetime can be 100 times greater than comparable Al-Cu structures tested under the same conditi…
The energy loss of a pair of charges in correlated motion through an electron gas is calculated using Lindhard's dielectric function. The results of numerical integrations are presented and in particular the cases of low and high velocities are described. Analytical expressions for the energy loss are given for the ca…
The influence of borax and boric acid on the resistance of cellulose insulation to smouldering and flaming combustion has been examined using material treated by a wet application process. Boric acid has been shown to be required at an add-on level of at least 11.6 parts to 100 parts (by weight) of cellulose if resist…
The results of adhesion research clarify the role of copper and zinc in adhesion bonding and adhesion degradation. For the actual interpretation of the results, the difference between surface and average bulk composition must be considered. The tendency towards zinc enrich ment is mainly governed by the average brass…
The adsorption of copper, lead, cadmium and zinc ions by cellulose suspensions has been examined at pH values ranging from 3.5 to 11. The chemical form of the metal ions has been changed by adding ligands such as oxalic acid, citric acid, tartaric acid, ethylenediaminetetraacetic acid, ethylene- diamine, glycine, cyst…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDehydration kinetics for barium chloride dihydrate single crystalsR. Keith Osterheld and Paul R. BloomCite this: J. Phys. Chem. 1978, 82, 14, 1591–1596Publication Date (Print):July 1, 1978Publication History Published online1 May 2002Published inissue 1 July 1978https://pubs…
Microhardness of single crystals of V3Si and V3Ge as well as polycrystalline Nb3Ir, Nb3Au, and Nb3Sn have been measured. The relatively high ratio of hardness to elastic constant C44 supports the existence of strong covalency in A3B compounds of the A15 structure. Correlation with interatomic distance suggests covalen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of Poly(hexamethylene oxamide) [Nylon 62]Y. Chatani, Y. Ueda, H. Tadokoro, W. Deits, and O. VoglCite this: Macromolecules 1978, 11, 4, 636–638Publication Date (Print):July 1, 1978Publication History Published online1 May 2002Published inissue 1 July 1978https://pub…
Analysis of recently published X-ray and neutron diffraction data for LiOH reveals that there are pronounced non-spherical deformations of the electrondensity about the oxygen pseudo-atom. Comparison with a theoretical calculation of the electron density for the isolated hydroxide ion shows that these deformations are…
The morphological, cultural, physiological, and biochemical characteristics of a new actinomycete are described. The organism is distinctive because of the absence of aerial mycelium and the presence of glycine and LL-diaminopimelic acid in its cell wall. The mycelium bore numerous round-to-pyriform sporangia, each of…
The relaxed (110) surface electronic structure of GaAs is calculated within the tight-binding model. The symmetry and dispersion of the surface states are compared to those measured by angle-resolved photoemission experiments. Variations in photoemission intensity with measurement geometry are related to matrix-elemen…
Reflection spectra have been measured in the far infrared region (10 cm -1 –500 cm -1 ) for several kinds of crystals of transition-metal dichalcogenides (TX 2 ). Optical phonon frequencies of infrared active mode ( E ⊥ c ) are determined for the group IV compounds HfSe 2 , ZrSe 2 and TiSe 2 and for the group VI compo…
The effect of nickel and manganese addition on the ductility and magnetic properties of 6.5% silicon-iron sheet has been studied. Ductility was studied by tensile tests and cold-rolling under various conditions. It was found that the nickel addition did not improve the cold-workability of the alloys. Alloys with 0.10-…
Alloy characteristics that relate directly to wear resistance are much sought after, but elusive. Attempts have been made to correlate wear resistance with mechanical and physical properties, including hardness, but only with limited success. During the course of this investigation, cast, wrought, and hard facing wear…