Materials Literature
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The structure of post-irradiation annealed UO2 has been examined by transmission electron microscopy to try to understand the behavior and release of fission gas.At a dose of 2.2 × 1019 fissions/cm3, 5 × 1015 small gas bubbles/cm3 are observed in the material. These precipitate at 1100°C and appear to grow from 25 to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Iron(III)-Catalyzed Oxidation of Cysteine by Molecular Oxygen in the Aqueous Phase. An Example of a Two-Thirds-Order ReactionJay E. Taylor, Johnson F. Yan, and Jin-liang WangCite this: J. Am. Chem. Soc. 1966, 88, 8, 1663–1667Publication Date (Print):April 1, 1966Publicat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Reactions of Metallocenes with Electron Acceptors1aR. L. Brandon, J. H. Osiecki, and A. OttenbergCite this: J. Org. Chem. 1966, 31, 4, 1214–1217Publication Date (Print):April 1, 1966Publication History Published online1 May 2002Published inissue 1 April 1966https://pubs.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMacro Rings. XXXI. Quinone Derived from [2.2]Paracyclophane, an Intramolecular—Molecular Complex1Donald J. Cram and A. Colin DayCite this: J. Org. Chem. 1966, 31, 4, 1227–1232Publication Date (Print):April 1, 1966Publication History Published online1 May 2002Published inissu…
Samples of the titanium oxides with O/Ti ratios between 0.5 and 1.67 were prepared by heating mixtures of Ti and TiO 2 in high vacuum to 1500°C and annealing them in silica ampuls at 900° to 1100°C. Results of chemical and X‐ray analyses are combined with previously published data to form a complete phase diagram. The…
Photochemical decomposition of matrix-isolated carbon suboxide at 4.2°K with 1470-Å light produces highly reactive carbon atoms, presumably from an observed CCO intermediate. Reactions of carbon atoms with nitrogen lead to the observation of the infrared absorptions of the NCN and CNN radicals. Attempts to form methyl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSulfoxide-Carbodiimide Reactions. III.1 Mechanism of the Oxidation ReactionA. H. Fenselau and J. G. MoffattCite this: J. Am. Chem. Soc. 1966, 88, 8, 1762–1765Publication Date (Print):April 1, 1966Publication History Published online1 May 2002Published inissue 1 April 1966htt…
Abstract The preparation of five samples of poly(methyl methacrylate) covering a wide range of tacticity and their electron irradiation to produce series of varying molecular weight are described. The glass transition temperature T g of each polymer was determined by DTA techniques. Plots of T g and the reciprocal of…
The influence of cell age, cell size, cell shape, and mode of colony formation on diatom sinking rates was investigated in 26 experiments with Skeletonema costatum (Grev.) Cleve and Rhizosolenia setigera Brightwell. The mean sinking rate of S. costatum ranged from 0.30 to 1.35 m/day; the absolute minimum and maximum r…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Alexander E. Karu, Michael Beer; Pyrolytic Formation of Highly Crystalline Graphite Films. J. App…
Numerical calculations of the powder pattern of the central component shifted by the second-order nuclear quadrupole interaction in solids have been performed for various values of the asymmetry parameter, η. Shape functions have been obtained in units of (νQ2/6νL) (a—¾) for η=0.1, 0.2, ···, 1.0, at 0.1 intervals. Als…
Abstract Intercrystalline links in polyethylene have been revealed by crystallizing from the melt mixtures of fractionated polymer and the linear hydrocarbon n ‐C 32 H 66 , the latter constituent being removed later by washing at room temperature in an organic solvent. These fibrous links measure up to 15,000 A. in le…
Earlier experimental work (J. Ferguson, H.J. Guggenheim and Y. Tanabe, J. appl. Phys. 36 (1965) 1046, Phys. Rev. Letters 14 (1965) 737) on the Mn pair spectrum of KZnF 3 :Mn and the spectrum of KMnF 3 has been extended. The narrow bands of KMnF 3 and RbMnF 3 have been assigned and their abnormally high intensities est…
Article Notizen: Zur Defokussierungsabhängigkeit des Phasenkontrastes bei der elektronenmikroskopischen Abbildung was published on April 1, 1966 in the journal Zeitschrift für Naturforschung A (volume 21, issue 4).
To explain the large isotope effect on the transition temperature in KH2PO4, the tunneling motion of the protons in hydrogen bonds is considered and a theory of the phase transition is developed under the assumption that the ferroelectric behavior of this substance is due to cooperation of the ionic displacements, the…
Samples of tellurium-doped indium antimonide that exhibited solute banding when solidified in a horizontal boat under ordinary conditions showed no bands when solidified in the presence of a vertical dc magnetic field. The effect of the field was to damp the thermal convection in the molten sample to the point of supp…
The theory of particle coarsening kinetics under control by diffusion through the matrix and by phase-boundary reaction is reviewed, and extended to the case of diffusion control when the particles are closely spaced and for impurity control at the interface. For the first case, d̄=f(T,φ)t⅓, Nv=f(T,φ)t−1, where d̄ is…
The effect of volume exclusion on the mean-square radius of gyration s2 is treated by use of the empirical expression W0(s)=const s6exp[−(7/2)〈s2〉0−1s2] for the statistical distribution of s for a system of linear chain molecules unperturbed by volume exclusion. Segment interactions within the perturbed molecule are t…
Paramagnetic Fe3(PO4)2·4H2O is monoclinic, with lattice constants a=10.541±0.005, b=4.646±0.004, c=9.324±0.005 Å and β=100°25.8′±1.0′ at 298°K, with two formula weights in the unit cell. The space group is P21/a. The positions of the iron, phosphorus, and oxygen atoms, determined by Ito and Mori in 1951, together with…
The crystal structure of tetramethylammonium hydroxide pentahydrate has been determined at 25°C by an analysis of the three-dimensional x-ray-diffraction data. The unit cell is orthorhombic with a=12.57, b=10.96, c=7.91 Å and contains four formula units. The OH− ions and H2O molecules form a hydrogen-bonded framework…