Materials Literature
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Abstract The spin-independent properties of an electronic system are completely determined by spinless density functions, P1(1; 1') and P 2( 1,2; 1',2 '), derived from the 1-and 2-electron density matrices, p1(1; 1') and p2(1,2 ; 1',2'). These functions, and their physical inter-pretation, have been dealt with in par…
The transmission (${\ensuremath{\eta}}_{T}$) of electrons through thin films of C, ${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$, Al, Ni, Ag, and Au, together with their distribution in angle and energy, were measured in a spherical retarding-potential analyzer. The distributions were characterized by average and most probabl…
The Hall mobility of carriers in photoconducting insulators can be varied over an appreciable range by the effects of photoexcitation. Such a variation can result either (1) from a change in the density of scattering centers as the result of a change in the occupation of imperfection centers, or (2) from the initiatio…
Measurements have been made of the growth of the $F$ band in undeformed, deformed, and heat-treated KCl crystals at room temperature using 140-kvp x-ray irradiation. The growth curves were analyzed in terms of the initial concentration of negative-ion vacancies in the lattice before irradiation, rate of formation of n…
The relative optical absorption coefficient $\ensuremath{\alpha}$ of polycrystalline slabs of cuprous oxide was measured at 295\ifmmode^\circ\else\textdegree\fi{}K, 77\ifmmode^\circ\else\textdegree\fi{}K, and 4.2\ifmmode^\circ\else\textdegree\fi{}K. At 4.2\ifmmode^\circ\else\textdegree\fi{}K, $\ensuremath{\alpha}$ is…
The crystal structure of CeCu/sub 2/ was determined. A Ce-Cu alloy containing 66 at.% copper was melted in vacuum at 1081 deg C in a MgO crucible and slowly cooled. Crystals from this ingot were sealed in thin Pyrex tubes and examined with a precision camera. The crystals were found to be onthorhombic, space group Imm…
The structural nature of the spontaneous polarization of NaNO/sub 2/ below its transition point was investigated by neutron diffraction. A set of (Okl) single crystal data was collected at room temperature. The positional coordinates and their standard deviations were compared with those of Truter and Carpenter. The s…
Glycine has three polymorphs, among them the 7-form crystallizes in the hexagonal space group /)31 or P32 with unit-cell dimensions a -7.037, c = 5.483/~. Its crystal structure has been determined by two-dimensional Fourier and three-dimensional least-squares methods. The dimensions of the molecule are close to those…
The author have investigated on wetting characteristics of galena produced from Japan by means of spheroidal drop method. Advancing contact angles were affected with roughness and chemical composition of samples. A formation of new crystal on the surface of depressed galena was determined by electron diffraction metho…
Abstract Microscopic study of Corallinaceae algae previously described from the Thanetian (lower Eocene) of the Pyrenees shows that 34 of the species belong to existing species, and only 21 are actually new species. Although these algae are quantitatively important in the region, the generally poor state of preservati…
The release of the fission gases, xenon and krypton, from molten irradiated uranium was studied experimentally at total initial gas contents of 0.002–138 parts per million. At concentration levels anticipated in spent EBR-II fuels, over 99% of the xenon and krypton is expected to be removed from the molten metal.
Melt refining experiments in which irradiated uranium or synthetic EBR-II alloys were melted in oxide crucibles have shown that removal of zirconium as an oxide does not occur at temperatures up to 1400°C. Removal of zirconium by carbon scavenging of the melt was approximately 50% in 5-hr melts at 1400°C; the mechanis…
Observations of changes in crimp of wool fibers during supercontraction in aqueous solutions have led to a means of modifying the crimp of fibers from a single fleece. Felting studies on such modified fibers have shown that straightening of the wool facilitates felting whereas the imposition of tight coils in the fibe…
Abstract The secondary electron emission from the non-activated and activated surfaces of copperberyllium (4%) by the impacts of various noble gas and hydrocarbon ions was studied together with the determination of the surface structure by the electron diffraction analysis. The main results obtained are as follows. (1…
Materials capable of trapping alkali metal vapors at temperatures up to 800°C were tested and a number of surface-active mterials proved efficient. A sufficient quantity of Molecular Sieves, activated alumina or activated carbon can be contained in a crucible cover to trap and hold the evolved alkali metal vapors from…
Experimental results from a low-temperature test program on magnesium alloys are reported. The new data include: (1) tensile properties of cast AZ91C-T6, AZ92A-T6, EZ33A-T5, HK31A-T6, QE22A-T6, and ZH62A-T5 alloys at −320, −109, 75, 200, and 300 F; (2) notched and unnotched Charpy impact strength of these same alloys…
Ruthenium, molybdenum, palladium, rhodium, technetium, and antimony are retained by the bulk metal when uranium containing macrolevels of accompanying fission elements is melt-refined in oxide crucibles at 1200–1400°C. Under similar conditions, cadmium and tellurium are nearly quantitatively removed, the latter elemen…
The crystal structure of antlerite has been worked out by means of the heavy atom method through the two-dimensional Patterson and Fourier syntheses. The lattice constants of the mineral are a0=8.23±0.02Å., b0=12.00±0.02Å. and c0=6.03±0.01Å. Its space group is Pnam, and there are four chemical units of composition Cu3…
Conventional nickel cadmium cells contain the active materials in either porous sintered nickel plaques or in nickel or nickel‐plated steel pockets or tubes. A new process, adaptable to continuous methods of production, has been developed in which the active and conductive materials are dispersed in a microporous plas…
The gyromagnetic ratios of two different ferromagnetic alloys of manganese were measured by Einstein-deHaas experiments. The Heusler alloy ${\mathrm{Cu}}_{2}$MnAl gave a ${g}^{\ensuremath{'}}$ value of 1.993\ifmmode\pm\else\textpm\fi{}0.002. The alloy MnSb gave a ${g}^{\ensuremath{'}}$ value of 1.978\ifmmode\pm\else\t…