Materials Literature
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Phases with the stoichiometry R5Co19have been observed in the rare earth-cobalt systems with R = La, Ce, Pr, and Nd. These phases may play a significant role in the development of coercive force in RCo5-based permanent magnets containing the light rare earths, particularly mischmetal. The present paper reports Curie t…
The X-ray intensity distribution in the incident plane for a crystal containing a straight dislocation has been computed. The trajectories of the wave fields have been drawn in the case of a planar or spherical incident wave, and it has been shown that the interaction of the defect with the X-rays gives rise to new di…
Comparisons of calculated solutions with experimental results for the impact of a 9.53-mm-diam nylon sphere on a 12.7-mm-thick steel plate at 5.182 km/sec are presented. Numerical solutions are difficult to obtain with existing Eulerian codes because of the need for accurate treatment of material strength and the defi…
The cation distribution of single crystal manganese ferrites Mn1-yFey[MnyFe2-y]O4with0.06 \leq y \leq 0.24was modified by appropriate heat treatment at temperatures 300-600°C. With these samples the Curie temperature, the magnetocrystalline anisotropy, the spontaneous magnetization and the differential susceptibility…
The influence of the deviation from stoichiometry on the magnetic properties has been investigated on the compositions given by the formula (NiO)α(ZnO)1-α(Fe2O3)xwhere α = 0.30 ; 0.36 and 0.9s, Tc), the influence of the deviation is much lower but unambiguous. It is the variation of the Curie temperature with x which…
In the context of an SCF π-electron theory an exact expression is derived which yields xπ ⊥, the total π-electron contribution to the magnetic susceptibility perpendicular to the plane of a polycyclic conjugated hydrocarbon. Once given the first-order correction to the bond-order matrix of the molecule in question (wh…
Room‐temperature optical absorption spectra, electron spin resonance spectra at 15° to 18°K, electrical conductivity, and emf measurements on concentration cells at 1620°C are analyzed and used to determine the defect structure of Codoped α‐Al 2 O 3 . The crystals are mixed ionic and electronic conductors at 1620°C: i…
When the network system is limited, most ferroelectric glass‐ceramics will produce a fully crystallized transparent body when cerammed at low temperatures. Higher‐temperature heat treatment results in crystal growth and gradual loss of transparency. In the transparent state, the crystal size is limited to ∼2000 Å. Pie…
Microscopic details of physical changes occurring in steel plates impacted at hypervelocities by spherical projectiles of several materials are studied by means of metallographic examinations of polished and etched target cross sections. A hemispherical volume of material beneath the impact site undergoes the pressure…
Abstract We have shown in this and the preceding paper that fully compounded stocks can be analyzed for all main constituents by use of a combination of DSC, TG, and DTG. Further, this can be achieved on a time scale consistent with routine quality control. DSC gives information on cure characteristics, sulfur, and ac…
Abstract Phosphate adsorption by several Hawaiian and Indian soils, and the relation of phosphate adsorption to hydroxyl, sulfate, and silicate ions released in two Hawaiian soils were studied. Adsorption isotherms of some of the soils show an abrupt increase in phosphate adsorption at high concentrations. The isother…
Abstract The crystal structure of the title compound has been determined from three-dimensional X-ray data collected on Weissenberg photographs, using CuKα radiation. The intensities were estimated visually with a standard scale. The structure was solved by the heavy-atom method and refined by the least-squares method…
Abstract Contributions to the structural strength of meat samples by the myofibrillar and connective tissue components were altered by varying the myofibrillar contraction state, muscle type and the cooking temperature. Shear, tensile and adhesion measurements were used to evaluate quantitatively changes in the proper…
We report magnetic and x-ray diffraction studies on a single crystal of [N(n-Bu)4]2[Cu(mnt)2], where mnt = maleonitriledithiolato (C4N2S2)−2. The planar paramagnetic (S=1/2) [Cu(mnt)2]−2 anions crystallize in stacks with crystallographically equivalent sites, and the stacks are isolated by the cations. The compound cr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of extraplanar ligands on the redox properties and the site of oxidation in iron, ruthenium, and osmium porphyrin complexesGilbert M. Brown, Frederick R. Hopf, Thomas J. Meyer, and D. G. WhittenCite this: J. Am. Chem. Soc. 1975, 97, 19, 5385–5390Publication Date (Prin…
Corrosion products of amalgam produced in Ringer's solution were compared with products formed in vivo using scanning electron microscopy, X-ray microanalysis, and potentiostatic anodic polarization. The corrosion products in an old amalgam were probably a mixture of tin-oxide and tin oxychloride. In vitro corrosion o…
We have measured the magnetomechanical coupling in highly magnetostrictive TbxDy1-xFe2-δas a function of bias field, x, and δ. We find a peak coupling factor of 0.6 at x = .26 and bias field of 180 Oe; the largest reported for a magnetostrictive material. The corresponding material Q is 200. Because of the high magnet…
A friction-testing instrument has been designed for attachment to the Instron tensile tester. It provides for dual, synchronized measurements of the friction and contact forces between fibers of yarns sliding over each other. The instrument consists of a micrometer, pressure jaws, and an electrical force transducer to…
Auger electron spectroscopic techniques were used to monitor the surface composition of a beryllium–copper alloy upon heating and oxidation to determine the surface composition necessary for maximum secondary-electron yield. A 500–1000 Å BeO layer on the surface was found to give rise to the maximum secondary-electron…
In this paper we investigate the influence of hydrostatic pressure (up to 1000 bar) on the magnetization mechanisms of spinel polycrystalline ferrites. The results presented here have been obtained on the composition Ni.36Zn.64Fe2O4. We show that : - the inverse of the initial susceptibility increases linearly with th…