Materials Literature
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The lifting field of a free conducting particle (FCP) situated on a dielectric coated electrode in compressed SF6 gas is calculated based on two different particle charging mechanisms-partial discharges occurring in the gas surrounding the particle and charge conduction through the dielectric coating. Calculated value…
It is shown that a Fourier series associated with the Warren-Averbach line-shape analysis can be fitted with only five parameters to a pair of peaks. These interrelate the Fourier coefficients and thereby provide a simplified series which has been applied to the study of a Mo film on a Si crystal. The parameters inclu…
The formation enthalpies of solid alloys in the FeGe, CoGe, NiGe, FeSn, CoSn and NiSn binary systems have been determined with the aid of a solution calorimeter using liquid tin as solvent. The formation enthalpies exhibit negative and, sometimes, high values. Parameters influencing the magnitude of the Δ H B va…
The proton hyperfine coupling tensors in the Cu(H2O)6 2+ ion in Mg(NH4)2(SO4)2.6H2O single crystals at 15 K have been measured by ENDOR spectroscopy. The values obtained are discussed in the framework of conventional molecular orbital theory for copper complexes and can be understood quite satisfactorily. The geometry…
Corrosion protection afforded by pretreating copper in aqueous benzotriazole solutions at temperatures ranging from 25 to 100 C were evaluated. Electrochemical characteristics of pretreated copper mirrors were monitored using rapid polarization techniques. Thickness of surface films were analyzed by infrared multiple…
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…