Výsledky vyhledávání - "Keith D. Keefer"

Ion beam analysis of interface reactions in magnetite and maghemite thin films

Autor: Suntharampillai Thevuthasan, Sang I. Yi, Keith D. Keefer, David E. McCready, Weilin Jiang, Saravanamuthu Maheswaran, Scott A. Chambers

Publikováno v: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. :510-514

We have investigated interface reactions between expitaxially-grown magnetite (Fe3O4) and maghemite (γ-Fe2O3) films with MgO substrates using Rutherford backscattering (RBS), channeling, and X-ray diffraction (XRD). Annealing these films in 2.0 × 1

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5ce279eb97a901115618bf33c3a2df69
https://doi.org/10.1016/s0168-583x(99)00701-6

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Preparation and Characterization of Nonpolar Fluorinated Carbosilane Dendrimers by APcI Mass Spectrometry and Small-Angle X-ray Scattering

Autor: Keith D. Keefer, Jean'ne M. Shreeve, Bamidele A. Omotowa, R. L. Kirchmeier

Publikováno v: Journal of the American Chemical Society. 121:11130-11138

The following highly fluorinated nonpolar dendrimers were obtained in high yields from multiple hydrosilylation reactions between core hydride terminated carbosilane dendrimers and allyl-1,1-dihydrotrifluoroethyl ether or allyl-1,1-dihydroheptadecafl

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fd608580b7514f47217ff9f855dd1867
https://doi.org/10.1021/ja992794r

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Solubility limits of silicate melts

Autor: L. René Corrales, Keith D. Keefer

Publikováno v: The Journal of Chemical Physics. 106:6460-6469

A statistical mechanical model of silica melt is presented in which metal oxides are incorporated into the bonding network. In this approach a Flory-type lattice model for binary silicate melts is coupled with a set of chemical reactions that determi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::439c98cfc87b58cba4513183150efd20
https://doi.org/10.1063/1.474122

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Experimental and calculated X-ray powder diffraction data for cesium titanium silicate, CsTiSi2O6.5: A new zeolite

Autor: M. Lou Balmer, David E. McCready, Keith D. Keefer

Publikováno v: Powder Diffraction. 12:40-46

Standardized experimental and calculated X-ray powder diffraction data for a new synthetic zeolite, cesium titanium silicate, CsTiSi2O6.5, are reported. In addition, a structure model in space groupIa3d(230), which is isomorphous with the mineral pol

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::38bce1dbcfb604579d1cb53c9481aec0
https://doi.org/10.1017/s0885715600009416

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A study of aluminum speciation in aluminum chloride solutions by small angle x-ray scattering and 27Al NMR

Autor: Keith D. Keefer, Amit Singhal

Publikováno v: Journal of Materials Research. 9:1973-1983

Aluminum ions may exist in one of several different types of polynuclear species depending upon the degree to which it is hydrolyzed. The hydrolysis of aluminum can be explained by a metastable equilibrium among Al(H2O)3+6, Al(OH)(H2O)2+5, Al13O4(OH)

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::452c6bbfe91600d3323de3d018c9351f
https://doi.org/10.1557/jmr.1994.1973

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Structural studies of precursor and partially oxidized conducting complexes. 1. A neutron diffraction and spectroscopic investigation of quasi-one-dimensional potassium tetracyanoplatinate (1.75:1) sesquihydrate, K1.75[Pt(CN)4].1.5H2O

Autor: Nancy P. Enright, Donald M. Washecheck, Keith D. Keefer, Jack M. Williams

Publikováno v: Inorganic Chemistry. 15:2446-2455

The complete molecular structure of quasi-one-dimensional, partially oxidized potassium tetracyanoplatinate (1.75:1) sesquihydrate, K/sub 1/./sub 75/(Pt(CN)/sub 4/).1.5H/sub 2/O, has been determined by a single-crystal neutron diffraction study. The

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::707e27fdf8166a9db99e5eb036389f23
https://doi.org/10.1021/ic50164a028

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Polymerization of silicate and aluminate tetrahedra in glasses, melts, and aqueous solutions—III. Local silicon environments and internal nucleation in silicate glasses

Autor: Charles M Taylor, B.H.W.S. de Jong, Keith D Keefer, Gordon E. Brown

Publikováno v: Geochimica et Cosmochimica Acta. 45:1291-1308

The local, up to second nearest neighbor, around Si atoms in alkali and alkaline earth-silicate glasses has been characterized by SiKβ X-ray emission spectroscopy. Principally two types of Si atoms can be distinguished. These are Si atoms with only

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5d7a9b2123952fc67d00d188a0c94a41
https://doi.org/10.1016/0016-7037(81)90223-4

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