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Now showing items 1 - 11 of 11

  • Application of vacuum deposition methods to solid oxide fuel cells

    L.R. Pederson   P. Singh   X.-D. Zhou  

    ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
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  • Combustion synthesis of YBa2Cu3O7?x: glycine/metal nitrate method

    L.R. Pederson   G.D. Maupin   W.J. Weber   D.J. McReady   R.W. Stephens  

    A combustion synthesis method has been developed to simply and rapidly prepare YBa 2Cu 3O 7-x and YBa 2Cu 3O 7-x/Ag from an aqueous solution of the metal nitrates and glycine. Glycine served both as the fuel for combustion and as a complexant, important to prevent inhomogeneous precipitation of individual components prior to combustion. Ash collected following combustion consisted of well-mixed, soft agglomerates of barium carbonate, yttrium oxide, cupric oxide, and/or copper metal, depending on the ratio of fuel to oxidant. This mixture was calcined at 900degC for 4 h to convert the product to YBa 2 Cu 3O 7-x. Samples sintered at 950degC for 8 h and annealed in oxygen at 450degC for a like time showed a Tc (midpoint) of 92.5 K with a width of 1.4 K and a high degree of phase-purity. This synthesis method is well suited to the preparation of a wide variety of multicomponent ceramics
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  • Reaction of soda lime silicate glass in isotopically labelled water

    L.R. Pederson   D.R. Baer   G.L. McVay   M.H. Engelhard  

    Soda lime silicate glass was leached in D 218O at 25, 50, and 90degC up to 500 h and was examined using non-resonant nuclear reaction and Rutherford Backscattering analysis. Replacement of sodium by deuterium (D/Na=2.3plusmn0.5) was consistent with earlier results, which have been cited as support for an ion-interdiffusion leaching mechanism. However, uptake of 18O was in excess of D ( 18O/D=1.6plusmn0.3), with 18O penetrating to depths as great as those from which Na was extracted. Results indicate extensive hydrolysis and condensation reactions of the silicate matrix within the surface reaction layer while alkali is being extracted, an example of a `transformed' surface structure through which water has relatively easy access
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  • Two-dimensional chemical-state plot for lead using XPS

    L.R. Pederson  

    X-ray photoelectron spectroscopy (XPS or ESCA) is of particular value among surface analytical techniques, since both compositional and chemical information about photoemitting atoms can be gained, usually with negligible effects due to the X-ray source. Traditionally, energy shifts in prominent photolines (core excitations) were the primary means by which chemical-state information was extracted. Chemical-state shifts of X-ray-stimulated Auger lines are often more extensive than those of photolines. The author reports two-dimensional chemical-state data for 22 lead compounds using XPS
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  • Are neutral sodium atoms produced on glass surfaces by electron bombardment?

    L.R. Pederson  

    Recent papers have speculated that neutral sodium atoms are produced in significant quantities in glass by electron bombardment, XPS measurements on an electron-bombarded soda lime silicate glass revealed no evidence for neutral atoms at the surface or at depths up to the maximum penetration of the electron beam
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  • Are neutral sodium atoms produced on glass surfaces by electron bombardment?

    L.R. Pederson  

    Recent papers have speculated that neutral sodium atoms are produced in significant quantities in glass by electron bombardment, XPS measurements on an electron-bombarded soda lime silicate glass revealed no evidence for neutral atoms at the surface or at depths up to the maximum penetration of the electron beam
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  • Are neutral sodium atoms produced on glass surfaces by electron bombardment?

    L.R. Pederson  

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  • Characterization of new and degraded mirrors with AES, ESCA and SIMS

    L.R. Pederson   M.T. Thomas  

    Samples representing each stage of second surface mirror production were examined with AES, ESCA and SIMS, in combination with ion sputtering. Finished mirrors exposed to the exterior environment were also analyzed. Significant weathering had already occurred on a 6 month old soda-lime-silicate glass that was intended for use in the Barstow solar pilot plant. Such weathering may adversely affect the quality of mirrors produced from this glass. Further glass-water reactions occur during the silvering step, which was demonstrated by the detection of deuterium into the glass on mirrors made from D 2O silver solutions. On degraded specimens, sulfur was strongly associated with the reacting edge of the copper films, while chloride was similarly associated with the silver films, implying that these elements are important corrosive agents. Initial degradation may involve attack from the paint side on the copper film as well as reaction at the silver-glass interface. Water appears to accelerate the degradation
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  • Thermal dissolution of aluminum oxide layers on tungsten and molybdenum 〈111〉 and on tungsten {110} in the presence of electric fields

    L.R. Pederson   R. Vanselow  

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  • Thermal dissolution of aluminum oxide layers on tungsten and molybdenum 〈111〉 and on tungsten {110} in the presence of electric fields

    L.R. Pederson   R. Vanselow  

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  • Comparison of stannous and stannic chloride as sensitizing agents in the electroless deposition of silver on glass using X-ray photoelectron spectroscopy

    L.R. Pederson  

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