Materials Literature
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Abstract Qualitative and quantitative results from previous studies of the thermoluminescence induced in polyethylene by irradiation are used in an attempt to deduce the main polyethylene electron traps. It is concluded that the most probable traps are the molecular chains themselves, the different degrees of molecula…
The solidification mechanism of melts of monotectic composition is considered. It is shown that important microstructural differences can arise as a result of changes in the relative magnitudes of the interfacial energies between the two liquids and the solid substrate. Conflicting results from previous publications a…
A technique is developed for estimating the rigid-disk partition function near close packing, by evaluating the specific free-energy contributions from correlated motion of larger and larger sets of contiguous particles. In terms of the reduced density θ=A0/A (A0 is the close-packed value of the closed system's area A…
The decay of individual fluorescent transitions excited by monochromatic radiation was measured for most rare earths in hexagonal LaCl3 and other lattices. At 4°K the decay was found to be invariably exponential within the experimental errors; at higher temperatures it could occasionally be represented by several expo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Adsorption and Reaction of Coordination Complexes on Silica GelRobert L. Burwell Jr., Ralph G. Pearson, Gary L. Haller, Pueh B. Tjok, and Stephen P. ChockCite this: Inorg. Chem. 1965, 4, 8, 1123–1128Publication Date (Print):August 1, 1965Publication History Published onl…
Lanthanum‐doped Ba 0.6 Sr 0.4 4TiO (OH) 2 C 2 O 4 .4H 2 O was prepared by precipitation from a pH‐controlled oxalic acid solution for conversion to the titanate. TGA and DTA support the proposed formula of a hydrated, mixed hydroxyoxalate. Density and resistivity measurements of the titanates are correlated as a funct…
Shear stress-shear strain curves of ordered and disordered Cu3-Au single crystals have been obtained over the temperature range 77 to 500°K. Analysis of the data indicates (i) the strain hardening rate in stage II, θII, for the disordered condition is essentially independent of temperature, and (ii) θII for the ordere…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe meso Reactivity of Porphyrins and Related Compounds. I. NitrationR. Bonnett and G. F. StephensonCite this: J. Org. Chem. 1965, 30, 8, 2791–2798Publication Date (Print):August 1, 1965Publication History Published online1 May 2002Published inissue 1 August 1965https://pubs…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiffusional Effects in Gas-Solid ReactionsJohn Shen and J. M. SmithCite this: Ind. Eng. Chem. Fundamen. 1965, 4, 3, 293–301Publication Date (Print):August 1, 1965Publication History Published online1 May 2002Published inissue 1 August 1965https://pubs.acs.org/doi/10.1021/i16…
Single crystals of bismuth germanate Bi4(GeO4)3 having the eulytine structure, space group Td6, were grown. They were crucible-free pulled from a pool of molten material produced in its own powder at 1040°C by a thermal imaging technique. The material has an index of refraction of 2.07 and transmits light between 0.4…
The various methods for the synthesis of optical thin film systems with prescribed properties are reviewed. One general approach is to refine numerically the properties of an initial system. In many problems, however, the choice of a suitable starting design for refinement is not at all obvious. The present paper desc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal Properties of Atactic and Isotactic PolystyreneF. E. Karasz, H. E. Bair, and J. M. O'ReillyCite this: J. Phys. Chem. 1965, 69, 8, 2657–2667Publication Date (Print):August 1, 1965Publication History Published online1 May 2002Published inissue 1 August 1965https://pubs…
A transition from brittle to ductile behaviour of single-phase polycrystals is shown experimentally to be a consequence of a change in slip character rather than of a change in yield stress. In the case of a b.c.c. Fe-Co alloy, deformation by planar glide induces brittleness, whereas the alloy is ductile if it deforms…
The results of an experimental investigation of luminescence and energy trapping in the polymeric systems atactic and isotactic polystyrene and atactic polyvinylnaphthalene are presented. It is shown that the anomalous emission bands observed at 3350 Å in the polystyrenes and at 4100 Å in atactic polyvinylnaphthalene…
Abstract The homogeneous polymerization of acrylonitrile by electron transfer initiators is investigated. In a rigorously purified system at low temperatures it is demonstrated that “living” polyacrylonitrile is formed, and that its molecular weight can be predetermined. The number‐average molecular weight of “living”…
A study of the nuclear reactor irradiationinduced changes in the electrical and lattice properties of ferroelectric Pb(Zr 0 . 65 Ti 0.35 )O 3 + 1 wt% Nb 2 O 5 revealed that these changes in properties are caused by different damage centers. The changes observed in electrical properties were: (1) P r decreased but P 3…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPlutonium BoridesHarry A. EickCite this: Inorg. Chem. 1965, 4, 8, 1237–1239Publication Date (Print):August 1, 1965Publication History Published online1 May 2002Published inissue 1 August 1965https://pubs.acs.org/doi/10.1021/ic50030a037https://doi.org/10.1021/ic50030a037resea…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Preparation and Structure of Cadmium Rhenium Oxide, Cd2Re2O7Paul C. Donohue, John M. Longo, R. D. Rosenstein, and Lewis KatzCite this: Inorg. Chem. 1965, 4, 8, 1152–1153Publication Date (Print):August 1, 1965Publication History Published online1 May 2002Published inissue…
The application of optical transfer theory to the process of image formation requires that the image-forming system be linear and space invariant. In a space-invariant system, the point image retains its shape while the point source explores the object plane. The purpose of this paper is to investigate image-forming s…
Mechanism of formation of iron sulfide film during corrosion of Armco iron by liquid phase H2S-CO2-H2O and H2S-CO2-H2O-iron sulfide systems has been studied. Weight loss, weight of film remaining on the metal, number of blisters formed and chemical composition, as determined by electron diffraction, were measured as a…