Materials Literature
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The resistivity, Seebeck coefficient, Hall coefficient, and superconducting transition temperature have been measured in ${\mathrm{K}}_{x}$ W${\mathrm{O}}_{3}$ for $0.20<~x<~0.32$ over the temperature rangee 1.5 to 375 K. The normal-state transport properties show temperature- and composition-dependent anomalies…
Abstract A fast physical method is used to measure oxygen solubilities in various solutions of sugars and salts, in nutrition media, and in fermentation broths of Penicillium chrysogenum . The findings were compared with the predictions of a solubility model which assumes that the solubility reduction is log‐additive…
Solution and solid state studies of TCNQF4 are reported. The electron affinity of TCNQF4 has been derived from spectral observations of the visible-near IR charge-transfer band for the pyrene complex and compared to that derived from the half-wave potentials used to characterize its reactivity in solution. It is demon…
Normal-state electrical resistivity has been studied in Cu-Nb composites containing 7.5, 10.0, and 15.0 vol% niobium filaments formed by an in situ process. The resistivity of the as-drawn and annealed composite wires was measured at temperatures between 300 and 825 K and just above the superconducting transition (∼9…
Polymeric iron (III) complexes of malonic, succinic, furmaric, and phthalic acids have been prepared and studied by variable-temperature (15-300 K) magnetic susceptibility, 57Fe Mossbauer spectroscopy, and infrared spectroscopy. In addition, properties of iron(III) acetate have been reinvestigated using these same tec…
Abstract Powders of nylon 66 were crystallized from solution in methanol and in other solvents. These powders exhibit a latent heat of about 4.5 cal/g at the Brill transition near 200°C where the unit cell changes from a triclinic to a pseudohexagonal form. The dimensions of the hydrogen‐bonded sheets are almost uncha…
Heat-treatment methods for obtaining low core loss in Fe rich amorphous alloys with high magnetic induction and the physical mechanism concerned will be discussed. Field annealing is necessary to avoid inducing local magnetic anisotropies or magnetic domain wall fixing, and then to make stress relieving effective. Con…
Raman and infrared spectra of rhombohedral selenium have been measured and the fundamental bands observed in these spectra are assigned by analogy to the S 6 ring molecule. Calculation of the normal mode vibration for the Se 6 ring using a modified Urey-Bradley force field confirms this assignment. Anomalous softening…
The explosion hazard of methane-air mixtures has become an increasingly serious problem in mining, and an advance assessment of methane gas potential is therefore essential for a safe and economic mine development program. As part of its coal mine health and safety program, the Bureau of Mines has developed a simple,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of carbon deposition during methanation of carbon monoxideDavid C. Gardner and Calvin H. BartholomewCite this: Ind. Eng. Chem. Prod. Res. Dev. 1981, 20, 1, 80–87Publication Date (Print):March 1, 1981Publication History Published online1 May 2002Published inissue 1 M…
The crystallographic and the magnetic structures of Y(Mn1−xFex)12 intermetallic compounds were investigated. They crystallize in the ThMn12 structure type. The Y atoms occupy the 2(a) sites and the transition metals are distributed on 3 nonequivalent sites 8i, 8j, and 8f. We have determined the solid solubility limit…
No abstract available.
Abstract The balance of surface charge in a soil is developed from the perspective of coordination chemistry and is employed to derive the conditions under which the zero point of charge is equal either to the crossover point of two proton titration curves or to the point of zero net charge (point of equality between…
Graphite in a strong magnetic field ( H // c -axis) has a one-dimensional electronic energy spectrum with small bandwidth. A recent experiment of magneto-resistance on graphite in \(H \lesssim 30\)T, which showed an anomalous increase of the resistance, is explained by a charge density wave (CDW) instability associate…
Surface plasmons can be excited on a metal by an external plane-wave beam through the use of prism or grating couplers or by introducing roughness. This can enhance the electric field at the surface compared with that in the incident beam, and it has been suggested that this effect is an important aspect of surface-en…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoresponsive polymers. 2. Reversible solution viscosity change of polyamides having azobenzene residues in the main chainMasahiro Irie, Yasuo Hirano, Shoichi Hashimoto, and Koichiro HayashiCite this: Macromolecules 1981, 14, 2, 262–267Publication Date (Print):March 1, 198…
The magnetocaloric effect in polycrystalline Gd was measured at temperatures from 190 to 370 K in applied fields from 1 to 7 T. The magnetocaloric temperature changes were combined with existing zero-field specific heat data to construct a T-S diagram for Gd near the Curie point. Experimental values of ΔT were also co…
Abstract Very large positive temperature coefficients of resistivity (PTC) found in a narrow temperature range with dispersions of carbon blacks in noncrystallizing polymers are caused by an increase in average particle or aggregate distances of the dispersed black. This effect is the result of their deagglomeration u…
The magnetocrystalline anisotropy has been known for a long time to be very large in the RCo5 intermetallics. The recent availability of high D.C. magnetic fields up to 200 kOe has enabled us to carry out an extensive experimental study of the energy and magnetization anisotropies in YCo5 from 4.2 K to 300 K. The magn…
Abstract An experimental study was carried out to investigate the effects of coupling agents on the rheological properties, processability, and mechanical properties of highly filed polypropylenes (PP). Inorganic fillers used were CaCO 3 and glass beads, and coupling agents used were two silane coupling agents, N‐octy…