Materials Literature
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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…
Abstract A wide range in morphology paralleling a spectrum of phase separated and dissolved rubber, can be developed in rubber‐modified epoxies through control of rubber‐epoxy compatibility and cure conditions. These morphologies result in different stress response mechanisms. Dissolved rubber promotes plastic deforma…
Mechanisms of magnetization reversal and factors determining coercivity are reviewed for various permanent-magnet materials.
Results of recent synthetic, structural, and magnetic work on exchange coupled copper (II) ions bridged by nonmagnetic ligands are discussed, including the quasi-linear chain compound bis (dimethyldithiocarbamato) copper (II) in which the copper (II) ions are antiferromagnetically exchange coupled. An unusual correlat…
Abstract A variety of different morphologies, and therefore mechanical properties, can be obtained from a single rubber‐modified epoxy formulation. The volume fraction, domain size, and the number of particles of phase‐separated rubber are determined by the competing effects of incompatibility, rate of nucleation and…
The emission intensities in the range of 2000–8000 Å of CF, CF2, O, F, CO, CO+, and CO2 produced in CF4/O2 radio-frequency discharges, operated at 1 Torr of pressure and 50 W of power input, have been used to follow the etching process of Si and SiO2, as a function of the CF4/O2 feed composition. The addition of small…
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