Results 241 to 250 of about 112,711 (289)
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Surface reactivity of MgO oxygen vacancies
Catalysis Today, 1999Abstract The interaction of gas-phase molecules (O 2 , CO and H 2 ) with oxygen vacancies (F s centers) on the MgO(1 0 0) surface was studied by cluster models ab initio wave functions. The F s centers exhibit a high reactivity towards O 2 , CO and H 2 at variance with the regular sites of the MgO surface.
Gianfranco PACCHIONI +1 more
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Surface Science, 1996
Abstract The electronic and atomic structures of nondashstoichiometric MgO {100} surfaces, with several densities of neutral oxygen vacancies, have been studied using a semi-empirical Hartree-Fock method associated with a geometry optimization code. The oxygen vacancies are periodically repeated in the surface top layer with equal spacings.
E. Castanier, C. Noguera
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Abstract The electronic and atomic structures of nondashstoichiometric MgO {100} surfaces, with several densities of neutral oxygen vacancies, have been studied using a semi-empirical Hartree-Fock method associated with a geometry optimization code. The oxygen vacancies are periodically repeated in the surface top layer with equal spacings.
E. Castanier, C. Noguera
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Oxygen‐Vacancy‐Enhanced Singlet Oxygen Production for Selective Photocatalytic Oxidation
ChemSusChem, 2020AbstractOxygen vacancies are usually thought to be beneficial for photogenerated charge separation. In this work, the oxygen vacancies in ov‐Bi2O3 (Bi2O3 with oxygen vacancy) were found to be able to produce 1O2 in the dark owing to chemical adsorption.
Jiajia Wang +8 more
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Oxygen vacancies in lithium niobate
Applied Physics Letters, 1983Optical absorption peaks at 760 and 500 nm in LiNbO3 are assigned to oxygen vacancies containing one and two electrons, respectively. The 500-nm band appears after annealing above approximately 500 °C in a vacuum, i.e., a reducing atmosphere, and continues to grow with increasing anneal temperature.
K. L. Sweeney, L. E. Halliburton
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Interaction of oxygen vacancies in yttrium germanates
Physical Chemistry Chemical Physics, 2012Forming a good Ge/dielectric interface is important to improve the electron mobility of a Ge metal oxide semiconductor field-effect transistor. A thin yttrium germanate capping layer can improve the properties of the Ge/GeO(2) system. We employ electronic structure calculations to investigate the effect of oxygen vacancies in yttrium-doped GeO(2) and ...
Wang, Hao +3 more
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Oxygen vacancy diffusion in bare ZnO nanowires
Nanoscale, 2014Oxygen vacancies (VO) are known to be common native defects in zinc oxide (ZnO) and to play important roles in many applications.
Bei, Deng +6 more
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Oxygen Vacancies in Barium Oxide
Physical Review, 1953It has been shown by Dash that an optical absorption band at 2.0 ev occurs in BaO crystals when these are treated in barium or other metal vapors, giving the crystals a blue color. In order to determine the way the stoichiometric excess of metal is present in the lattice, the diffusion of the blue coloration into BaO has been measured over the range ...
R. L. Sproull, R. S. Bever, G. Libowitz
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Radiation Effects and Oxygen Vacancies in Silicates
Science, 1970Proton and electron irradiation of silicates, minerals, and rocks produces a paramagnetic defect whose resonance spectrum is identical to that of the singly charged oxygen vacancy in silica glass and α-quartz. It is suggested that this defect is characteristic of all structures containing SiO 4 tetrahedra.
A, Chatelain, J L, Kolopus, R A, Weeks
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Oxygen vacancy chemistry in oxide cathodes
Chemical Society ReviewsThis review focuses on the chemical thermodynamics and reaction kinetics of intrinsic and anionic redox-mediated oxygen vacancies in oxide cathodes.
Yu-Han Zhang +8 more
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Oxygen vacancy migration in MLCCS
2018 Pan Pacific Microelectronics Symposium (Pan Pacific), 2018The multilayer ceramic capacitor (MLCC) has become a widely used electronics component. The MLCC technologies have gone through a number of material and process changes such as the shift from precious metal electrode (PME) configurations which were predominantly silver/palladium to base metal electrodes (BME) dominated by nickel and the expiration of ...
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