Materials Literature
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Abstract Small amounts of Fe(III) induce precipitation of Fe(II) from carbonate solutions around neutral pH values. The reaction involves the formation of Fe(II)Fe(III) hydroxycarbonate, a green, layer-structured compound of the pyroaurite group of minerals. Variations in the concentration of Fe(II) in the solution ph…
Measurements were made of the dielectric constant along the ferroelectric axis ε a , the spontaneous polarization P s and the heat capacity c p of Rb 2 ZnCl 4 crystals in the temperature range from -150^° C to 150°C. The normal-incommensurate transition point determined as the peak position of c p lies at 30.1°C, whic…
This state-of-the-science publication on fracture test techniques for glass, ceramics, rocks, and cementitious composites is a compilation of 14 papers which were presented at the Eleventh National Symposium on Fracture Mechanics, which was held June 12-14,1978, at Virginia Polytechnic Institute and State University,…
Abstract Melt‐spun and injection‐moulded liquid crystalline polyesters have very high strength and stiffness and a very low coefficient of linear thermal expansion. The exceptional properties that characterise these polyesters are due to the presence of stiff, rod‐like polymeric chains, which become highly oriented du…
A powder profile refinement program written specifically for the easy application of structural constraints is made generally available. It is based on ORFLS and written in Fortran IV. Details of the philosophy of the program are outlined, with emphasis on the areas where more research is necessary. Examples of usage…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWool as a Biological Composite StructureHelmut Zahn, Josef Föhles, Magdalene Nlenhaus, Annette Schwan, and Manfred SpelCite this: Ind. Eng. Chem. Prod. Res. Dev. 1980, 19, 4, 496–501Publication Date (Print):December 1, 1980Publication History Published online1 May 2002Publis…
The available data on secondary emission yields from electron bombarded polymers was reviewed to identify those features they have in common with metals and inorganic insulators. As in the case of the more widely studied materials it was found that when the yield δ obtained at a bombarding electron energy Eo, is divid…
Three-pointed planar Si4 stars with unelucidated bonding and planar Si5 rings have been found in Li12Si7. In the formulation shown below with x = 4 and y = 10 the star could be an excited tetrahedrane state as Si; for x = y = 8 the star would be Si and isoelectronic with the carbonate ion.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIncreased yield of a desired isomer by equilibriums displacement on binding to silica gel, applied to meso-tetrakis(o-aminophenyl)porphyrinJonathan LindseyCite this: J. Org. Chem. 1980, 45, 25, 5215Publication Date (Print):December 1, 1980Publication History Published online…
Attention was focused on the first steps in the pitting process, the adsorption of aggressive anions and the dissolution of aluminum oxide. The adsorption of chloride on alumina and aluminum powder are quite similar and show a saturation plateau at high chloride concentration; the amount of chloride adsorbed is propor…
The degree of alteration in clinopyroxenes from eclogitic inclusions in South African kimberlites is directly related to the deviation from stoichiometry of remnant unaltered areas in individual grains. Deviations from stoichiometry are reconciled by allowing up to 9% vacancy in the M2 site. The breakdown reaction acc…
Explicit expressions are given for the stress fields of extrinsic or intrinsic boundary dislocation arrays on the basis of recent results concerning the elastic properties of interfacial dislocations. It is shown that these stress fields differ only by constant terms. Examples of α-β brass boundaries illustrate anisot…
We present a model of the V${\mathrm{O}}_{2}$ phase transition which incorporates both electron-electron and electron-lattice interactions and accounts for the presence of two $d$ bands (${\ensuremath{\pi}}^{*}$ and ${d}_{\ensuremath{\parallel}}$) overlapping at the Fermi level of the metallic phase. Attention is give…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoluminescence and photoreduction of vanadium pentoxide supported on porous Vycor glassMasakazu Anpo, Ichiro Tanahashi, and Yutaka KubokawaCite this: J. Phys. Chem. 1980, 84, 25, 3440–3443Publication Date (Print):December 1, 1980Publication History Published online1 May 2…
The influence of TiO, on the structure of silicate melts has been determined at I atm pressure by laser Raman spectroscopy. The following melt compositions were used: CaSiOr, CaMgSirOu, NarSiOr, NaAlSi3Os, CaAl2OE, and NarTiOr. Titanium is in four-fold coordination in all melts studied, as there are no Raman bands bel…
Biomechanical testing of connective tissue is usually done on whole tissue. Studies of the mechanical properties of each component of the tissue, however, are important for elucidating the connection between the functional properties and the molecular structure. Enzymic degradation of one component at a time followed…
A simple nonlinear theory of viscoelasticity has been developed for application to elastomers. The theory is the viscoelastic generalization of the kinetic theory of rubber elasticity, and it is used to model time and rate-dependent effects. The method of derivation reveals that the theory is applicable to stress-impo…
Abstract The vulcanization of RTV (=room temperature vulcanizing) silicone rubbers under the action of organotin compounds is investigated. The mechanism for the cure is inferred from the chemical properties of a variety of relevant organotin compounds and is illustrated with the reactions that occur when dialkyltin d…
Polarised and unpolarised neutron measurements have been carried out on a YCo 5 single crystal. These have allowed the crystal structure to be refined and the magnetisation density distribution of this compound to be determined. The analysis of these results indicates that the moment of one of the two cobalt sites (Co…
Infrared reflection spectra of strontium titanate are reported as obtained with a scanning interferometer from room temperature up to 1200 K. A fit of the factorized form of the dielectric function to reflectivity data yields the temperature dependence of TO and LO frequencies, dampings, and TO oscillator strengths. T…