Materials Literature
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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…
We describe a technique for exposing patterns of spatial period p/n using near-field diffraction from masks of spatial period p. The technique, which we propose to call ’’spatial-period-division’’, can be used with visible, UV, or x-ray radiation. With soft x rays, it is possible to produce gratings of much finer spat…
Deuterium magnetic-resonance studies of spectral patterns from spinning samples are made to measure the relative contribution of various orientational order mechanisms to the biaxiality of the hydrocarbon chain in the smectic $C$ phase. The detailed theory of motional averaging as applied to the spinning techniques is…
Abstract The different types of morphology that can be developed in a large number of low‐density (branched) polyethylene whole polymers, as well as in a series of fractions, have been studied for two different extreme crystallization modes. Concomitantly, thermodynamic properties of the same samples have also been de…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of the metamagnetic 1:1 1-D phase of the decamethylferrocenium 7,7,8,8-tetracyano-p-quinodimethanide: Fe[C5(CH3)5]2+.cntdot.(TCNQ)-.cntdot.Joel S. Miller, Arthur H. Reis Jr., E. Gebert, J. J. Ritsko, W. R. Salaneck, L. Kovnat, Thomas W. Cape, a…
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Abstract Secondary nucleation kinetics for potash alum in draft‐tube baffled crystallizers have been determined from steady state crystal size distributions measured down to about 5 μm. Differences in nucleation rates were found for crystallizers of similar geometry but different capacity. Models relating the frequenc…