Materials Literature
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The sonoluminescence from 17 different gases dissolved in water was measured. The results show an inverse relation with the thermal conductivity of the gas. The thermal conduction losses of the gas in the cavitation bubble during its rapid collapse are considered, and an expression found for the final temperature of t…
Copper samples containing dissolved hydrogen up to a few hundred atomic p.p.m. have been prepared by quenching from equilibrium at higher temperatures. Measurements of the annealing of the residual resistivity up to 150°C show that the hydrogen precipitates around room temperature and the precipitation is controlled b…
The purpose is to make clear the fundamental physical nature of the Invar problem, disregarding its details. After a brief discussion of the practical applications of the Invar alloys, the large magnetovolume effects and the anomalous magnetic properties are reviewed. The basic ideas of the various interpretations of…
A description has been given of the general features of the cap model as used to represent geological materials. In addition, the theoretical basis for the model has been indicated and a particular example of the model has been presented. The model is intended to represent the behavior of a wide range of geological ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn NMR Investigation of the Interaction between Carbon Black and cis-PolybutadieneJ. O'Brien, E. Cashell, G. E. Wardell, and V. J. McBriertyCite this: Macromolecules 1976, 9, 4, 653–660Publication Date (Print):July 1, 1976Publication History Published online1 May 2002Publish…
The sintering behavior of primarily covalently bonded β‐SiC, Si, and Si 3 N 4 was studied using surface area and densification measurements as well as observations of microstructures developed during firing. The existence of highly dense, microscopic regions and large (≥100°) dihedral angles in fired compacts of β‐SiC…
A review of the luminescence properties of amorphous semiconductors is presented. The materials covered are chalcogenide glasses, silicon and arsenic. Luminescence spectra, excitation spectra, temperature dependences and lifetimes are described. The radiative transition in chalcogenides is the recombination of an elec…
Constitutive relations for metal nonelastic deformation are proposed. The descriptiion is entirely in terms of real time strain rate. The equations are fully three-dimensional, and the description is incremental. Changes of loading direction are treated in a simple manner. The current deformation state of the metal is…
Displacive phase transitions and phase transitions of the type disorder-order usually result in symmetry changes such that the space groups of both structures are related as group and subgroup. The subgroups of a space group always belong to one of the following three types: they have either the same primitive cell as…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular stereochemistry of two intermediate-spin complexes. Iron(II) phthalocyanine and manganese(II) phthalocyanineJohn F. Kirner, W. Dow, and W. Robert. ScheidtCite this: Inorg. Chem. 1976, 15, 7, 1685–1690Publication Date (Print):July 1, 1976Publication History Publishe…
The one-electron density function for a group of atoms within the asymmetric region of a unit cell is represented by a finite multipole expansion of the charge density about each atomic center. Each atomic expansion is called a pseudoatom. If the pseudoatom charge density is effectively rigid with nuclear motion, then…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA surface study of cobalt-molybdena-alumina catalysts using x-ray photoelectron spectroscopyThomas A. Patterson, James C. Carver, Donald E. Leyden, and David M. HerculesCite this: J. Phys. Chem. 1976, 80, 15, 1700–1708Publication Date (Print):July 1, 1976Publication History…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEvaluation of candidate solids for high-temperature desulfurization of low-Btu gasesPhillip R. Westmoreland and Douglas P. HarrisonCite this: Environ. Sci. Technol. 1976, 10, 7, 659–661Publication Date (Print):July 1, 1976Publication History Published online1 May 2002Publish…
Abstract Since the first intensive literature review on silicas and silicates was published, significant new technology for their use in rubber has developed. Usage in the rubber industry has broadened considerably, and increases in their consumption have occurred during the ensuing fifteen years. From the “soles and…
Polysulfone has been sulfonated to varying degrees using a sulfur trioxide–triethyl phosphate complex as the sulfonating agent. These conditions are suitable for surface sulfonation as well as solution sulfonation. The neutralized, sodium salt form is much more stable than the free acid form. The glass transition temp…
A description is given of a method for growing chromium-activated yttrium aluminum garnet crystals. The results are reported of an investigation of the influence of chromium concentration from 0.01 to 1.0 wt.% on the absorption and luminescence spectra of garnet crystals. Broadening and short-wavelength shift of the R…
Pervasive alteration is a common feature of metamict minerals. Previous studies of metamict niobium-tantalum-titanium oxides and electron microprobe analyses of altered areas in metamict yttrialite document the leaching of uranium, thorium, and rare earth elements. These data suggest that glasses may not provide a sta…
Over 300 small-scale experiments have been performed to investigate the interaction that sometimes occurs when hot liquid metal is poured into a container of water. IN these experiments molten tin was used. The violence of each interaction was classified by measuring the ratio of the mass of comminuted tin to the orig…
The crystal structure of (CH3NH3)2MnCl4 (MAMC) is determined by neutron diffraction at 188 K in the low temperature tetragonal phase (P42/ncm). The sequence of structural phase transitions of MAMC can be discussed in terms of NH …︁ Cl bridges between NH3 and certain Cl−-ions. The order of the room temperature orthorh…
The $\ensuremath{\omega}$ phase transformation in Zr-Nb alloys has been studied by measuring x-ray and M\"ossbauer diffuse scattering from single crystals with compositions ranging from 8- to 30-wt% Nb. We present an extensive two-dimensional mapping of the x-ray diffuse scattering for all compositions. The distinct f…