Materials Literature
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In this paper we present a theoretical study of the optical and microwave properties of microscopically inhomogeneous disordered materials. We derive an effective-medium theory (EMT) for the propagation of light in a heterogeneous system by means of a self-consistent extension of a multiple-scattering model. This appr…
The magnetically induced circular-polarized emission associated with the vibrational sideband of the 2 E g to 4 A 2g transition of V 2+ and Cr 3+ ions at sites of cubic symmetry in MgO is reported. The Zeeman selection rules are derived and used to obtain a measure of the relative strength of the coupled T 1u and T 2u…
A new effect is reported: weak ferromagnetism induced in a ferroelectric antiferromagnet (BaMnF 4 ) by means of a linear magnetoelectric interaction. The direction and magnitude of spin canting in BaMnF 4 are calculated and found to be in agreement with experiment.
I present a theory of the electron energy-loss spectra observed in x-ray photoemission from the core levels of solids and report on calculations for the $2s$ and $2p$ core levels of Al, Mg, and Na. The calculation takes intrinsic as well as extrinsic plasmons into account, and in all cases the agreement between theory…
Catalytic reactions of carbon monoxide with hydrogen have been studied in which intermetallic compounds of the formula MNi(5) (where M is thorium, uranium, or zirconium) have been used as the catalysts. The materials perform effectively as methanation catalysts; ThNi(5) has a specific activity exceeding that of a typi…
The semiconductor liquid junction cell n-GaAs/0.8M K(2)Se-0.1M K(2)Se(2)-1M KOH/C has been shown to attain 9 percent photovoltaic power conversion efficiency in sunlight. Accelerated tests under 3100 degrees K light sources of several solar intensities indicate very low photocorrosion currents and high output stabilit…
Übersichtsbericht zur Beurteilung der Eignung von feuerfesten Oxiden, Mischoxiden und Oxidverbindungen als Festelektrolyte zur Sauerstoffmessung in Stahlschmelzen. Zusammenstellung und kritische Bewertung der elektrischen Eigenschaften der in Frage kommenden oxidkeramischen Festelektrolyte.
The crystal structure of a mineral with the stoichiometry (K0.58Ba0.36)2(Ti0.93FeIII0.06)6O13 has been determined by X-ray diffraction and refined by full-matrix least squares to a residual of 0.076 for 1688 ?observed? reflections. Crystals are monoclinic, C2/m, a = 15.453(2), b = 3.8368(7), c = 9.123(2) ?,ß = 99.25(1…
Abstract Crystallographic properties of illite and chemical properties of organic matter in various mudstones ranging in age from Archean to Miocene were investigated. The breadth of the (001) X-ray powder diffraction peak of illite correlates significantly with the ratio of aliphatic to condensed-aromatic components…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlumina Catalysts in Low-Temperature Claus ProcessMichael J. PearsonCite this: Ind. Eng. Chem. Prod. Res. Dev. 1977, 16, 2, 154–158Publication Date (Print):June 1, 1977Publication History Published online1 May 2002Published inissue 1 June 1977https://doi.org/10.1021/i360062a…
ABSTRACT A detailed examination of the reaction of THF with (CF 3 SO 2 ) 2 has been carried out and two prominently distinct oligomeric species have been found to be produced as intermediates during the polymerization which yields living products whose end groups consist of ions and esters in equilibrium. First, the r…
Abstract Oxo(2,3,17,18-tetramethyl-7,8,12,13-tetraethylcorrolato)molybdenum(V) was prepared from the corresponding corrole by the reaction with either molybdenum pentachloride or molybdenum hexacarbonyl. Spin Hamiltonian parameters were evaluated as g = 1.967, AMo=41.8×10−4 cm−1, and AN=2.3×10−4 cm−1. The results from…
Although a considerable number of studies have been made on the effect of heat on the properties of cellulosic materials ( 1 - 5 ), the alterations induced in the cellulose fine structure are incompletely understood. Little is known of the causes of the changes and how the changes affect physical properties of cotton…
The five elastic stiffness constants were determined for both single-crystal SmCo5 and for the commercially processed liquid-phase sintered (LPS) SmCo5 permanent magnet material. The LPS material is an aligned polycrystalline aggregate of SmCo5 crystallites oriented so that their magnetically easy c axes are approxima…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConfirmation of oxygen(1-) ion formation in .gamma.-irradiated 10 M sodium hydroxide/water (oxygen-17) alkaline ice glass by electron paramagnetic resonance studiesS. Schlick and Larry KevanCite this: J. Phys. Chem. 1977, 81, 11, 1093–1095Publication Date (Print):June 1, 197…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDifferential thermal analysis and reaction kinetics for nth-order reactionRalph T. Yang and Meyer. SteinbergCite this: Anal. Chem. 1977, 49, 7, 998–1001Publication Date (Print):June 1, 1977Publication History Published online1 May 2002Published inissue 1 June 1977https://pub…
Water trees have been experimentally grown in high molecular weight, low density polyethylene when subjected to a constant dc stress. Two major types of trees have been observed; bushy trees (one-half of a bow tie) emanating outward from microvoids and larger water channels penciling inward from the perimeter or outwa…
Résumé Les hydrates à deux couches et à une couche d'une saponite calcique ont été étudiés par infrarouge. Les résultats expérimentaux indiquent que dans l'hydrate à deux couches les molécules d'eau directement coordinées à l'ion calcium sont liées par liaisons hydrogène fortes d'une part aux atomes d'oxygène de surfa…
Abstract The resolution of 2‐methylproline and the assignment of absolute configuration to the stereoisomer has been carried out. The L‐enantiomer was obtained from the fractional crystallization of the quinine salt of (−)‐ N ‐carbobenzoxy‐2‐methylproline and the D‐enantiomer from the collected filtrates. The (−)‐2‐me…
Stripe domain patterns have been observed in a nematic liquid crystal film excited by ultrasonic waves propagating in a sandwiched glass-nematic-glass medium. The effect was found to be due to molecular reorientation induced by acoustic streaming in the nematic film. Based on a simple fluid dynamical model, we calcula…