Materials Literature
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Two rare earth materials, La2O2S:Tb and Gd2O2S:Tb, have significant potential as inputscreen phosphors for x-ray image intensifier use. These materials exhibit high luminescent efficiencies and high x-ray absorption. In this paper we present a detailed discussion of the properties of these new phosphors and suggestion…
Abstract Previous theoretical work dealt with polymer adsorption in which the adsorbed segments (trains) interact in the surface layer only. In this work the treatment is extended to Include also interaction between the loops dangling in solution. Fortunately, the excluded volume effects for adsorbed polymer chains ar…
A comparative study of tracer self-diffusion and creep has been carried out for the high-temperature plastic phase of succinonitrile. The results indicate that, as for other plastic solids, plastic deformation is self-diffusion controlled. Self-diffusion rates varied with temperature according to D=(4.3±1.3)× 10–4 exp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamic Properties of a Model Reinforced Elastomer. Styrene-Butadiene Reinforced with PolystyreneGerard Kraus, K. W. Rollmann, and J. T. GruverCite this: Macromolecules 1970, 3, 1, 92–96Publication Date (Print):January 1, 1970Publication History Published online1 May 2002Pub…
The crystal structures of triphenylgallium and triphenylindium have been determined. Both compounds crystallise with Z= 4 in a unit cell of space group Pbcn, but they are not iso-structural. In the indium compound short intermolecular contacts suggest that weak association occurs by donation of electrons from a phenyl…
The polarised single-crystal electronic spectra of CaCu(AcO)4,6H2O are assigned in S4 and D2d symmetries, with a dxy ground state and yield the one-electron orbital sequence: dxy > dz2 > dxz, dyz > dx2–y2. The e.s.r. spectra yield the orbital reduction factors r⊥= 0·78 and r∥= 0·926 . That r∥ > r⊥ indicates substantia…
The crystal structure of synthetic α-dimorphite, As4S3, has been determined by a three-dimensional single-crystal X-ray examination. The crystals, of space group Pnma, have Z= 4 in a unit cell of dimensions a= 9·12, b= 7·99, and c= 10·10 Å. The structure was determined by application of Sayre's equation and electron-d…
Description The papers in the Symposium on Impact Testing of Metals were given at the Seventy-second Annual Meeting of the American Society for Testing and Mater als held in Atlantic City, N. J., 22-27 June 1969. The sponsors of this symposium were Committee E01 on Methods of Testing, Subcommittee 7 on Impact Testing,…
SummaryBy electroforming a copper or nickel surface to give mechanical keying, its adhesion to epoxide laminates can be increased from a peel strength of 4 lb/in to 12 lb/in. By oxidation or chemical treatment of the metal surface an improvement in peel strength of about 1 lb/in is obtained.
Although anodization of zirconium and its alloys generally results in the formation of barrier‐type films, porous anodic oxide films can be produced in some electrolytes and by some preparation techniques. A survey of common electrolytes reveals that those containing nitrate, chromate, dichromate, and phosphate ions c…
Cancrinite has been synthesized in the sodalite crystallization field at 80° by addition of sodium nitrate, chromate, or molybdate. The crystals then contain these salts as guest species in place of the carbonate often found in natural cancrinites.This promotion of the formation of cancrinite was ascribed to associati…
Abstract The macroscopic C.R.S.S. for prismatic slip in Beryllium is found to increase with increasing temperature in the range −100 to +50 °C while the microyield limit decreases regularly. Slip is initiated on the prism planes from the edge dislocations present in the annealed material. Evidences of a thermally acti…
The vapor-phase germanium oxides GeO, Ge2O2, and Ge3O3 have been isolated in nitrogen and argon matrices. In a nitrogen matrix, infrared absorptions are observed at 973.4 (74Ge16O); 667.0, 599.0 (Ge216O2); 824, and 440 cm−1 (Ge316O3). A fourth species, Ge4O4, is formed on diffusion, and gives infrared absorptions at 5…
For some years now, many workers have been active in the development of a stainless steel that is resistant to pitting and crevice corrosion in halide media. Electrochemical techniques combined with statistical multiple‐regression analysis have beeen used to derive a relationship between pitting susceptibility and che…
Abstract Copper single crystals oriented for single glide were deformed in tension at 78 °K to various resolved shear stresses and were then neutron‐irradiated at 4 to 20 °K before stress‐removal in order to pin the dislocations in the stress‐applied state. A comparison of transmission electron micrographs obtained fr…
We present two methods for calculating the potential profiles of depletion layers in ferroelectric materials. The simplified method is valid for materials possessing a high permittivity and with the electric field parallel to the polarization. The second method is valid for low permittivity materials as well and can b…
N. H. Brett, K. J. D. MacKenzie and J. H. Sharp, Q. Rev. Chem. Soc., 1970, 24, 185 DOI: 10.1039/QR9702400185
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDelayed Fluroescence and Phosphorescence of Aromatic Ketones in SolutionJack. Saltiel, Howell C. Curtis, Lewis. Metts, John W. Miley, John. Winterle, and Mark. WrightonCite this: J. Am. Chem. Soc. 1970, 92, 2, 410–411Publication Date (Print):January 1, 1970Publication Histor…
Some electrochemical properties of polycrystalline tin oxide in the form of thin films have been examined. For a variety of antimony‐doped specimens the carrier concentration has been determined from the space charge capacity and compared with donor concentrations. Disparities between the two values have been found, a…
Les propriétés magnétostatiques des manganites de terres rares, TMnO3, ont été étudiées entre 2 et 1 500 °K environ. Ces composés sont antiferromagnétiques ; les points de Néel sont à des températures inférieures à 100 °K. On discute cet antiferromagnétisme dans un modèle du champ moléculaire ; on détermine l'ordre de…