Materials Literature
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Abstract High-resolution electron microscopy, in conjunction with controlled specimen preparation procedures, has enabled the nature and structure of novel {100} platelet defects found in TiO2-x (0 < x < 0.0035) to be studied at close to atomic resolution The precipitation of these platelet defects, ofte…
The incommensurate phase of krypton on graphite is studied by use of the molecular-dynamics simulation technique for systems with graphite substrate dimensions comparable to present-day laboratory capabilities. At low temperature and for all coverages, honeycomb networks of "heavy" domain walls are observed for the fi…
Abstract A new chlorination mechanism has been suggested for polyethylene crystals. Based on electron microsocopy and infrared spectroscopy of chlorinated high‐density polyethylene single crystals, it is proposed that beyond the initial chlorination of the lamellae surfaces, which accounts for only 2‐3% chlorine uptak…
Abstract The 13 C NMR spectra of tetraalkyl‐porphyrin and ‐chlorin complexes of nickel(II) were studied. The 13 C NMR of (5,10,15,20‐tetramethylchlorinato)nickel(II) supports the model of asymmetric charge distribution in this chlorin, as derived from the structure analysis and from previous proton NMR studies.
Abstract An unsteady‐state method for determination of the thermal diffusivity of a porous sphere, based on direct contact condensation of steam, was developed. A modified formula relating thermal diffusivity to porosity was proposed from theoretical considerations. Experimental measurements on known solids showed goo…
An experimental and numerical verification of profiles predicted by Cheo et al. [ J. Opt. Soc. Am.67, 1686 ( 1977)] for simultaneous TE- and TM-blazed triangular groove gratings is given. Corrected values also presented. The experimental results at 35 GHz show an n = −1 order diffraction efficiency as high as 99.9% fo…
An improved approach to the mechanical modeling of fuel rod performance is presented. Previous computer modeling has centered around a unified finite element approach with both fuel pellets and cladding being represented by ring elements. The fuel mechanical analysis code (FUMAC) departs from these approaches in two a…
Soil samples were collected from former radium processing sites in Denver, CO, and East Orange, NJ. Particle-size separations and radiochemical analyses of selected samples showed that while the greatest contents of both 226Ra and U were generally found in the finest (less than 45 micron) fraction, the pattern was not…
The Weeks–Chandler–Anderson perturbation theory is derived for one-dimensional Lennard–Jones systems. Its predictions are tested with molecular dynamics calculations on the full and repulsive Lennard–Jones potential. It is found that the prescription for the reference fluid is in excellent agreement with the computer…
The reflectance of liquids squalane and squalene between 2 and 25 eV have been determined by closed cell double ionization chamber methods. Kramers–Kronig analysis of the data gives optical functions from which are calculated the dielectric functions, energy loss functions, and mean free path for photons and electrons…
Abstract Diffraction intensity data of well ordered protoenstatite, MgSiO 3 , inverted from orthoenstatite, were collected at 1260°C and 1360°C by means of four-circle diffractometry using a gas flame heater. The effect of temperature on the structure of protoenstatite was studied based on these data and those at 1080…
Films of Cu 2 O , 30 μm thick, have been grown on copper metal foil at 1000°C in 1 % O 2 / Ar , heat‐treated without O 2 present at a number of lower temperatures, and quenched in water. The room temperature emission at 980 nm and its excitation spectrum, attributed to relaxed excitons at copper vacancies, are similar…
The character and extent of fuel/cladding chemical interaction (FCCI) have been established for mixed uranium-plutonium oxide, (U,Pu)O2, fuels irradiated in Experimental Breeder Reactor-II to peak fuel burnups to 14.5 at.% at beginning-of-life peak cladding temperatures to 730°C. The changes in character and the corre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon-13 and deuterium NMR spectroscopy of high-spin manganese(III) porphyrin halide and pyridine complexesHarold M. Goff and Andrew P. HansenCite this: Inorg. Chem. 1984, 23, 3, 321–326Publication Date (Print):February 1, 1984Publication History Published online1 May 2002P…
Abstract Aus KSn bzw. RbSn entstehen durch direkte Oxydation K 2 Sn 2 O 3 bzw. Rb 2 Sn 2 O 3 bei 320°C bzw. 410°C die bislang unbekannten „Tieftemperaturformen”︁ (a = 8,4100(8)Å bzw. a = 8,6368(8)Å), isotyp mit kubischem K 2 Pb 2 O 3 . Bei höherer Temperatur (510 bzw. 520°C) entstehen die bekannten Hochtemperaturforme…
The electrical conductivity of Li‐doped Cr 2 O 3 was investigated as a function of PO 2 , temperature, and dopant content. Results show that the electrical conductivity remains almost unchanged with decreasing P O 2 in the high‐P O 2 region but decreases rapidly at low P O 2 . A second phase was found in samples which…
By means of high-angle double-crystal X-ray diffractometry (HADOX), lattice constant measurements with a relative accuracy of better than one part in 106 have been made of SrTiO3 single crystals grown by the Verneuil method. An analysis of the temperature dependence of the lattice constants below the transition temper…
Abstract The dielectric properties of miscible blends of poly(vinyl chloride) (PVC) and poly(α‐methyl‐α‐n‐propy‐β‐propiolae‐tone) (PMPPL) have been investigated at different temperatures above and below T g . The results were analyzed using the Cole‐Cole representation and lead to the conclusion that this mixture does…
A general theory of a vibrating magnetometer pick-up system employing extended circular coils is outlined in the point magnetic dipole approximation. Systems based upon cylindrical and toroidal coils are discussed in more detail with some attention focused on the ability of the systems to measure simultaneously all co…
Mechanical and dielectric strengths were measured for BaTiO 3 , ceramics at room temperature. The results were evaluated in terms of Weibull statistics, and a clear analogy between the mechanical and dielectric strength distributions was found.