Results 151 to 160 of about 497,744 (196)

Monolithic aerogels in the systems SiO2B2O3, SiO2P2O5, SiO2B2O3P2O5

Journal of Non-Crystalline Solids, 1984
Abstract The gels in the binary and ternary systems: SiO 2 B 2 O 3 , SiO 2 P 2 O 5 , SiO 2 B 2 O 3 P 2 O 5 ; were prepared by hydrolysis and polydensation of metalorganic compounds. The gelling times vary with the molar percentage of SiO 2 . The solvent was evacuated under hypercritical conditions in an autoclave in order to obtain aerogels free
T. Woignier, J. Phalippou, J. Zarzycki
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HfSiO/SiO2- and SiO2/HfSiO/SiO2-gate stacks for non-volatile memories

Thin Solid Films, 2008
Abstract The use of hafnium silicate (HfSiO) as a charge trapping layer in charge-based non-volatile memory cells will be discussed. First, fundamental properties (e.g., dielectric constant, trap depths/levels) of the hafnium silicate layers, deposited from a single-source precursor, are deduced from capacitance–voltage and current density–voltage ...
Erlbacher, T., Jank, M.P.M., Lemberger, M., Bauer, A.J., Ryssel, H.   +4 more
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Photoluminescence from (Si/SiO2)n superlattices and their use as emitters in [SiO2/Si]n SiO2 [Si/SiO2]m microcavities

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2001
Si/SiO2 superlattices are recently under investigation to add optical functionality to silicon based microelectronics. In such superlattices quantum-confinement should drive Si to become a good light emitter. Emission properties can be further improved and controlled by placing the emitter in optical microcavities. In this paper emission properties of (
G. Pucker, P. Bellutti, Pavesi, Lorenzo
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Studies of SiO2 and SiSiO2 interfaces by XPS

Surface Science, 1979
Abstract The method to determine thickness distribution in thin films by X-ray photoelectron spectroscopy (XPS) has been modified for the determination of the thickness distribution of thermally grown silicon oxide films and the thickness of the SiSiO2 interfacial transition layer.
Takeo Hattori, Tatsushi Nishina
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Thermodynamic optimization of the systems PbO-SiO2, PbO-ZnO, ZnO-SiO2 and PbO-ZnO-SiO2

Metallurgical and Materials Transactions B, 1997
Liquidus-phase equilibrium data of the present authors for the PbO-ZnO-SiO system, combined with phase equilibrium and thermodynamic data from the literature, were optimized to obtain a selfconsistent set of parameters of thermodynamic models for all phases. The modified quasichemical model was used for the liquid slag phase.
Jak, Evgueni, Degterov, Sergei, Wu, Ping, Hayes, Peter C., Pelton, Arthur D.   +4 more
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Atomic structure of SiO2 at SiO2/Si interfaces

Applied Surface Science, 2000
The valence-band and O 2s core-level spectra of ultrathin (about I nm) SiO 2 layers formed in the initial stages of the oxidation of Si(100) substrates were measured by high-resolution X-ray photoelectron spectroscopy (XPS), and the energy difference between the bonding states in the valence-band and the core-level was found to be larger than the ...
K. Hirose, H. Nohira, K. Sakano, T. Hattori   +3 more
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Room temperature SiO2∕SiO2 covalent bonding

Applied Physics Letters, 2006
Room temperature covalent bonds between bonded silicon oxide layers can be realized by forming surface and subsurface absorption layers followed by terminating outmost bonding surfaces with desired bonding groups prior to bonding. For example, by introducing fluorine into bonding oxide layers and NH2 groups onto surfaces of bonding oxide layers before ...
Q.-Y. Tong, G. Fountain, P. Enquist
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Methanation of CO in transient states over Ru/SiO2, Ni/SiO2 and Pt/SiO2

Reaction Kinetics & Catalysis Letters, 1993
In CO methanation, the hydrogenation of surface carbon species are inhibited by reversibly adsorbed CO. The extent of inhibition is markedly different on the methals used.
Shin-ichiro Fujita, Masato Nakamura, Nobutsune Takezawa   +2 more
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Nitrogen solubility in CaO-SiO2, CaO-MgO-SiO2, and BaO-MgO-SiO2 melts

Metallurgical Transactions B, 1990
Nitrogen solubility in molten CaO-SiO2, CaO-MgO-SiO2, and BaO-MgO-SiO2 silicate systems was measured as functions of nitrogen and oxygen partial pressures and composition at 1823 K. Experimental findings indicate that nitrogen exists as a free nitride ion or is associated with silicate networks, depending principally on the slag composition.
Martinez R. Eloy, Nobuo Sano
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Differential Enthalpies of Solution of Components in Binary Systems 2 CaO . Al2O3 . SiO2-CaO . Al2O3 . 2 SiO2, CaO . SiO2-CaO . Al2O3 . 2 SiO2 and CaO . SiO2-2 CaO . Al2O3 . SiO2

Collection of Czechoslovak Chemical Communications, 1993
Differential enthalpies of solution of components in binary systems 2 CaO . Al2O3 . SiO2-CaO . Al2O3 . 2 SiO2, CaO . SiO2-CaO . Al2O3 . 2 SiO2 and CaO . SiO2-2 CaO . Al2O3 . SiO2 as the function of composition and temperature were determined on the base of isothermal composition dependences of enthalpies of mixing and temperature dependences of heats ...
Ladislav Kosa, Ivan Nerád, Jozef Strečko, Ivo Proks, Katarína Adamkovičová   +4 more
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