Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Abstract Smectites were found to be dominant in the clay fraction of five calcareous soils of different great soil groups from various areas of Turkey. Characterization by X‐ray, thermal, infrared, and chemical analyses of these smectites in a Terra Rossa, Vertisol, Rendzina, and Volcanic Ash profile showed that they…
Scanning electron microscopes are now being developed to investigate the spatial distribution of chemical elements in the top few atomic layers of solids. Instruments using the Auger process are discussed here, as well as some applications to metallurgy and microelectronics
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic and spectral properties of chloroaqua[2,6-diacetylpyridinebis(semicarbazone)]iron(II) and diaqua[2,6-diacetylpyridinebis(semicarbazone)]nickel(II): ligand fields and bonding in pentagonal-bipyramidal complexesMalcolm Gerloch and Irene Morgenstern-BadarauCite this: I…
Peer Reviewed
Abstract The behaviour of the infrared‐active lattice vibrations of GaS, GaSe, InSe are studied by measuring the room‐temperature reflectivity in the 100 to 500 cm −1 frequency range when the incident wave vector is inclined at an angle θ to the crystallographic Z ‐axis. The experiments are performed in polarized ligh…
The complete differential electron-energy-loss probability is calculated for scattering of a fast electron by a thin uniaxial crystal foil at oblique incidence. Retardation effects are considered in the present calculation. In the long-wavelength limit the local dielectric tensor ${\mathrm{lim}}_{q\ensuremath{\rightar…
We concentrate on the Hall effect in magnetic 3d-metals, which shows an anomalous component varying nonlinearly with applied field. Its origin is spin-orbit coupling, and its manifestations are described as characteristic electron scattering processes: skew scattering and side-jump displacement. We shall consider thes…
Inelastic neutron scattering experiments in tetragonal KNb${\mathrm{O}}_{3}$ show a high anisotropy in some regions of the phonon dispersion relation and the existence of strong one-dimensional intercell correlations between atomic motions along the [100] and [010] directions, in agreement with x-ray diffuse-scatterin…
Superplastic behaviour in hot rolled AI-Si eutectic was investigated, for a grain size of 18 μm, over a range of strain rates, temperatures, and compositions. The AI-Si eutectic was successful in producing superplasticity with over 300% elongation. Two dominant superplasticity mechanisms seem to operate: a dislocation…
Abstract The clay mineralogy of soils from the moist southern Guinea savanna and subhumid northern Guinea savanna has been studied. All the soils occur on basement complex. Kaolinite is the dominant clay mineral in all the well‐drained soils, a property shared with the well‐drained soils of the humid tropical forests.…
The resistivity of CoS 2 having the pyrite structure was measured between 4.2 K and 300 K under pressure up to 18 kbar and under magnetic field up to 45 kOe. The hump anomaly just below the Curie temperature ( T c ) was found to become sharper with decreasing T c by pressure and to become sluggish with increasing T c…
Abstract Single filaments of nylon‐6 and of its mixtures with KCl, LiCl, and LiBr (salt content up to 5% w/w) were prepared by extrusion at 265°C. As‐spun filaments with a varying degree of orientation were obtained by altering the take‐up velocity a t constant outflow velocity. These as‐spun filaments were further su…
Abstract In this study we investigate the effect of crystallization rate on the extensibility (draw ratio) of spherulitic polyethylene film uniaxially deformed at room temperature. Draw ratios for deformed films increased with increasing crystallization temperature. Transmission electron microscopy of the microfibrill…
The dielectric and dilatometric properties of RbHSeO 4 are studied. It is found that RbHSeO 4 undergoes a phase transition at 173°C besides the 98°C phase transition and it is ferroelectric below the 173°C transition.
Boron content dependences of saturation magnetostriction λs at room temperature in as-quenched and annealed Fe100−xBx (15?x?25) and Co100−xBx (19?x?24) amorphous alloys were measured. The value of λs in Fe-B alloys peaks at x=20, while λs in Co-B alloys decreases with increasing boron content. For two series of alloys…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCavitation-induced polymerization of nitrobenzeneD. James. Donaldson, Michael D. Farrington, and Peeter. KruusCite this: J. Phys. Chem. 1979, 83, 24, 3130–3135Publication Date (Print):November 1, 1979Publication History Published online1 May 2002Published inissue 1 November…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry of organic bichromophoric moleculesHarry MorrisonCite this: Acc. Chem. Res. 1979, 12, 11, 383–389Publication Date (Print):November 1, 1979Publication History Published online1 May 2002Published inissue 1 November 1979https://pubs.acs.org/doi/10.1021/ar50143a00…
Abstract When glycerol is heated with an alkaline catalyst to over 230 C, water is evolved and polymerization occurs to form a whole family of polyglycerols ranging from diglycerol with 3 hydroxy groups, to triacontaglycerol with 32 hydroxy groups. The carboxylic acid esters of polyglycerols prepared by direct esterif…
In order to get a simple and accurate description of complex crystal structures, the stella quadrangula is used as a building unit to describe the following structures: SiF4, scheelite, NaZn13, Ru7B3 and Ba3Fe3Se7.
The isomer shift and the quadrupole splitting of 57Fe in the pyrite-type dichalcogenides, FeS2–CoS2–NiS2–NiSe2 and CoSe2, were measured at room temperature. It is concluded that the effects of atomic distance and electronegativity of ligand make comparable contributions to the isomer shift of a divalent iron in low sp…