Materials Literature
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A method, using differential scanning calorimetry, has been developed to estimate quantitatively orthorhombic and monoclinic sulfur in sulfur materials. Sulfur cooled from the melt at 120°C immediately gives monoclinic sulfur which reverts to orthorhombic sulfur within 20 hr. Limonene, myrcene, alloocimene, dicyclopen…
Abstract 1. A direct correlation between bound rubber content and molecular weight of soluble polymer was found for a wide range of carbon black samples and processing conditions in SBR. 2. No significant polymer degradation occurred during the ineorporation of carbon black into SBR rubber. 3. A theory was proposed to…
Abstract Numerous workers have examined the weathering products of soil minerals and have proposed empirical weathering sequences. The present paper outlines the development of a thermodynamic model that predicts in a systematic way several mineral transformations that can occur in soils. According to this model, the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of structural probe ions for relaxation studies in glasses. I. Spectroscopic properties of cobalt(II) in chloride-doped potassium nitrate-calcium nitrate glassesA. Barkatt and C. A. AngellCite this: J. Phys. Chem. 1975, 79, 20, 2192–2197Publication Date (Print):September…
Abstract The characterization of recently synthesized (Pro‐Pro‐Gly) n , n = 7, 8 is described, along with melting profile studies of its association equilibrium, and thermal quenching studies of the kinetics of its association reaction. The order of the kinetic reaction is about 3, implying that three peptide chains a…
Abstract A polymer bearing hydroxamic acid groups and having a high affinity for iron(III) was prepared through the following procedure. Acryloylalanine (III), prepared by the reaction of acryloyl chloride with alanine, was treated with N ‐hydroxysuccinimide in the presence of dicyclohexylcarbodiimide to give the N‐hy…
Magnetostriction measurements have been carried out in the cubic Laves phase compounds DyCo 2 , HoCo 2 and ErCo 2 from 10K to well above their respective Neel temperatures T N . The observed magnetostrictions are very large ( approximately 10 -3 ). The measurements confirm the extremely high anisotropy of these materi…
The fluorescence and phosphorescence of photomultiplier window materials under electron irradiation have been investigated using a Sr(90)-Y(90) beta emitter as the electron source. Spectral emission curves of uv-grade, optical-grade, and electron-irradiated samples of MgF(2) and LiF, and of CaF(2), BaF(2), sapphire, f…
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…