Materials Literature
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A model for the high-temperature embrittlement of He-containing metals is presented. The model is based on the formation of small He bubbles within the grains and on the nucleation and growth of grain-boundary cavities under the influence of He and external stress. These processes explain the strengthening of the grai…
Transmission electron microscopy, electron diffraction, and microprobe X‐ray analysis were used to study crystallization of glasses in the systems Li 2 O‐SiO 2 , BaO‐SiO 2 , and Li 2 O‐A1 2 O 3 ‐SO 2 . The ternary system, with 4 mol% TiO 2 added to an Li 2 O‐Al 2 O 3 ‐4SiO 2 composition, crystallizes with a simple mor…
Recently reported measurements made by Jenks and Bopp (1974, 1977) of the energy stored in heavily irradiated NaCl are reviewed in the light of recent understanding of radiation-damage processes in this material It is shown that, in the ranges of temperatures and dose rates of these experiments, the F-centres produced…
Using various interatomic row potentials, the atomistic structure of the core of a screw dislocation in the b.c.c. lattice has been computed. Stable core structure is either of a degenerate or a non-degenerate type depending on the shape of the interatomic row potential; the criterion for the core type is presented. A…
Ceramics are becoming increasingly important in many radiation environments. In addition to refractory fissionable fuels, electrical insulators will be needed for instrumentation in breeder reactor systems and will be widely applied in all fusion reactor concepts, including first‐wall coatings, blanket gaps, injectors…
Abstract—Picosecond absorption spectroscopy was used to determine the intramolecular energy relaxation processes occurring in Ni(II). Pd(II), Pt(II), and Zn(II) protoporphyrin IX dimethyl ester. Picosecond data on the rate of ground state repopulation and the kinetics of a transient intermediate made it possible to de…
The chemical and spectral properties of a series of hemocyanin derivatives were systematically compared to provide insight into the geometric and electronic structure of the oxyhemocyanin active site. The binuclear copper site is characterized as two tetragonal Cu(II) atoms bridged by both an endogenous protein ligand…
The impedance of a growing anodic oxide layer is inductive in a certain frequency range. This effect is related to the occurrence of transients after changes in current density or applied electric field. Measurements on aluminum samples in the frequency range 5 mHz‐10 kHz and the current density range 3 × 10 − 6 – 5 ×…
This paper presents a detailed study of solid state structure, oxidation state, and electron transport in Ni(dpg)2I and Pd(dpg)2I, dpg = diphenylglyoximato. The crystal structure of Ni(dpg)2I has been studied by x-ray diffraction at 23 and -160 C.
Abstract The mechanical behavior of compatible glassy polyblends based upon poly(2.6‐dimethyl‐ 1,4‐phe nylene oxide) (PPO) was investigated. In particular, the influence of composition, molecular weight, and molecular weight distribution upon the tensile modulus of the blend was assessed. Various possible correlations…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInterlayering of crystalline octacalcium phosphate and hydroxylapatiteWalter E. Brown, LeRoy W. Schroeder, and James S. FerrisCite this: J. Phys. Chem. 1979, 83, 11, 1385–1388Publication Date (Print):May 1, 1979Publication History Published online1 May 2002Published inissue…
Diffusion profiles of 63Ni tracer in single crystals of NiO following anneals at 522°-1000°C have been determined by a radio-frequency sputter-sectioning technique. The profiles were analysed in terms of diffusion in the NiO lattice, D1, together with a contribution from dislocations in low-angle grain boundary arrays…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of bis(tert-butyl isocyanide)(meso-tetraphenylporphyrinato)iron(II)-bis(toluene)Geoffrey B. Jameson and James A. IbersCite this: Inorg. Chem. 1979, 18, 5, 1200–1208Publication Date (Print):May 1, 1979Publication History Published online1 May 2002Published inissue 1…
Abstract The "differential" method of Achar, Brindley and Sharp (ABS) and the "integral" one of Coats and Redfern (CR) are applied to the dehydration of BaBr2-H20 and HCOOLi-H20 and to the thermal decomposition of Pb(SCN)2, and the kinetic parameters so obtained are compared with those deduced isothermally. The result…
Abstract The general method of obtaining the partition function and thermodynamic characteristics of polymer chains near an adsorbing surface, simulated by random walks on a lattice, is developed. The method takes into account the effect of short‐range interactions in polymer chains, in particular, the chain stiffness…
Abstract A nucleation theory for strain‐induced crystallization is formulated to explain and to predict the effects of molecular strain on crystallization kinetics and crystallite size. Unlike any current theories that have based their formulations on some assumed extended‐chain line nuclei or folded‐chain crystals, t…
ABSTRACT The effects of temperature and the presence of oxygen and reducing agent on the thermal stability of two naturally occurring labile folates were investigated Microbiological assay of samples heated from 49–100°C for various lengths of time revealed that the loss of 5‐methyltetrahydrofolic acid in aqueous solu…
The equation relating current to voltage for an electrode under charge-transfer control has been solved for a sinusoidal modulation of the electrode potential. The rectified Faradaic component has been obtained, so as to derive its value as a function of the Tafel parameter and of the amplitude of the modulating volta…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAttachment of organic groups to heteropoly oxometalate anionsFrans Zonnevijlle and Michael T. PopeCite this: J. Am. Chem. Soc. 1979, 101, 10, 2731–2732Publication Date (Print):May 1, 1979Publication History Published online1 May 2002Published inissue 1 May 1979https://pubs.a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and Viscosity of Poly(dimethylsiloxanes) with Random BranchesEnrique M. Valles and Christopher W. MacoskoCite this: Macromolecules 1979, 12, 3, 521–526Publication Date (Print):May 1, 1979Publication History Published online1 May 2002Published inissue 1 May 1979http…