Materials Literature
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Abstract Accurate vibrational frequencies are reported for pyrazole and for seven N ‐ and C ‐deuterated analogues from FT‐IR spectra for the vapour phase at room temperature, diluted CCl 4 solutions and polycrystalline solids and from Raman spectra in aqueous solutions. Several frequencies are reported for fundamental…
The elastic theory of nemtatic liquid crystals is used to determine whether it gives support for recent experimental observations of a novel periodic phase occurring in homeotropically aligned films when an electric field is applied in the plane of the film. The director remains in the plane defined by the film normal…
SmFe10(TiV)2 melt-spun ribbons based on the ThMn12 structure exhibit the high coercive force of nearly 728 kA/m after annealing at 1073 K. This is the highest value among the reported melt-spun ThMn12-type structure ribbons. Microstructural studies indicate that the ribbons consist of fine ThMn12 grains of 50–150 nm i…
Devonian rocks from the Orcadian Basin show an extreme range of organic maturity. Mean vitrinite reflectance ranges from 0-6 to 10.5~ and spore colour from yellow- orange to black. Illite/smectite (I/S) is abundant in the clay fraction of lacustrine mudrocks and shows variation in expandability from 30 to < 5~. A corr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBehavior of adsorbed polymer layers in shear and elongational flowsM. Bagassi, G. Chauveteau, J. Lecourtier, J. Englert, and M. TirrellCite this: Macromolecules 1989, 22, 1, 262–266Publication Date (Print):January 1, 1989Publication History Published online1 May 2002Publishe…
A new computer code SPECOMP has been developed to calculate displacement damage for compound materials. The code uses primary recoil atom energy distributions from the SPECTER code and thus requires no access to nuclear data bases. For each combination of recoil and matrix atom, the code determines the secondary displ…
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Measurements are reported of the dielectric properties of three laterally substituted dicyano compounds with large molecular dipole moments perpendicular to the long molecular axis. Results are given for the materials in solution, in the isotropic liquid state, and for one compound in the nematic state. There is evide…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolubility and density isotherms for potassium sulfate-water-2-propanolJerzy Mydlarz, Alan G. Jones, and Angel MillanCite this: J. Chem. Eng. Data 1989, 34, 1, 124–126Publication Date (Print):January 1, 1989Publication History Published online1 May 2002Published inissue 1 Ja…
The corrosion of zirconium alloys in aqueous lithiated solutions is sensitive to the concentration of the alkali and the temperature. In concentrated solutions, ⪢10-1 M in lithium hydroxide (LiOH) (700-ppm lithium) and at temperatures &gt;573 K, accelerated corrosion occurs at quite an early stage. Our investigati…
The spectroscopic characterization and electrochemistry of SnL(X)2 is presented where L is the dianion of tetra-p-tolylporphyrin or tetra-m-tolylporphyrin and X is ClO4–, Br–, Cl–, F–, or OH–. In all cases, electroreduction leads to porphyrin π anion radicals and dianions which were characterized in tetrahydrofuran by…
Corrosion inhibitors have been prepared by ethoxylation of four commercially available unsaturated fatty acid mixtures: tall oil, soya bean oil, cotton seed oil, and linseed oil. The compounds obtained have the general formula R–COO–(CH 2 CH 2 O) n –H, where R is mainly a mixture of C 17 H 29 , C 17 H 31 , and C 17 H…
Commercial and experimental steels containing various chromium concentrations have been assessedfor their resistance to the combined effects of abrasion and corrosion. The degree of work hardening and macro- and microtoughness of low carbon martensite alloys, dual phase alloys, and metastable austenitic alloys provide…
It has been shown by i.r. and XPS techniques that protonation of nitrogenated bases (ammonia, pyridine and pyrazine) is the major process that occurs on adsorption of these compounds in the intracrystalline environment of V2O5· 1.5 H2O xerogel. At room temperature the intercalation process takes place mainly by a prot…
The crack growth resistance of a textured, extruded alumina body was compared with that of an isotropic, isopressed body of similar grain size, density, and chemistry. R ‐curve levels reflected the preferred orientation; however, R ‐curve slopes ( dK IR / d Δ a ) were the same in all instances, implying a similar crac…
On etudie les mecanismes d'absorption d'energie lors de la perforation de boucliers composites ceramiques, incluant la rupture de la ceramique, la deformation du materiau ductile servant de support et du projectile lui-meme, et l'energie cinetique des fragments residuels et du support
The high thermal conducting mechanism of AlN ceramics has been investigated by the relationship between microstructure and thermal conductivity of the samples which were obtained by pressureless-sintering at 1900°C for 1-24h with Y2O3 2 at% addition as a sintering aid. The thermal conductivity increased gradually with…
Replicate excitation spectra of the fluorescence emission at 680 nm from 30 cultures of freshwater algae have been compared to determine the most sensitive regions for the differentiation of algal species. Spectra were normalized in four different ways prior to analysis in order to simulate different experimental appr…
Well-resolved Mossbauer spectra were obtained for CoMo-doped barium ferrite with variable doping (0-33% Fe), heat-treatment temperature (825-1200 degrees C), and sample temperature (90-300 K). Substitution was observed to occur primarily on the 12-K site, with little or no lattice distortion. A fitting model using fiv…
A quasicrystal built with three types of tiles is related to the well-known octagonal tiling. The relationships between both tilings are investigated. More precisely, we show that the coordinates of the vertices can be obtained in two different but equivalent ways. The structure factor is calculated exactly. We emphaz…