Results 241 to 250 of about 115,078 (291)
Some of the next articles are maybe not open access.
Oxygen Vacancy Engineering in Photocatalysis
Solar RRL, 2020Photocatalysis, which converts natural solar energy into chemical energy, has emerged as one of the most appealing technologies in the past decades. However, photocatalytic performances are limited by the poor absorption of visible light, charge‐carrier recombination during migration, and a high energy barrier for activating reactants. Oxygen vacancies
Yanmei Huang, Yu Yu, Yifu Yu, Bin Zhang
openaire +1 more source
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
openaire +3 more sources
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
openaire +1 more source
Vacancy–oxygen complex in Ge crystals
Physica B: Condensed Matter, 2003Vacancy-oxygen (VO) complexes in Ge crystals have been studied by means of high-resolution infrared absorption and deep-level transient spectroscopy (Laplace DLTS) measurements. It is argued that the VO center in Ge has three charge states: double negative (VO--), single negative (VO -) and neutral (VO0) with the corresponding energy levels at E( - /-)
Markevich, V. P. +7 more
openaire +1 more source
Oxygen Vacancy Migration in MLCCS
Pan Pacific Symposium, 2018ABSTRACT The 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 ...
openaire +1 more source
The Oxygen Vacancy in Crystal Phases of WO3 [PDF]
The Journal of Physical Chemistry B, 2005 The oxygen vacancy in WO(3) has previously been implicated in the electrochromism mechanism in this material. Previous theoretical calculations on the oxygen vacancy in WO(3) have not considered the full range of crystal structures adopted by the material. Here we report studies of the oxygen vacancy in seven crystal phases.
Chadwick, Alan V. +3 more
openaire +2 more sources
Tuning Oxygen Vacancies in Oxides by Configurational Entropy
ACS Applied Materials & Interfaces, 2023Tuning surface oxygen vacancies is important for oxide catalysts. Doping elements with different chemical valence states or different atomic radii into host oxides is a common method to create oxygen vacancies. However, the concentration of oxygen vacancies in oxide catalysts is still limited to the amount of foreign dopants that can be tolerated ...
Mengyuan Zhang +10 more
openaire +2 more sources
On the identification of the oxygen vacancy in HfO2
Microelectronic Engineering, 2011The single positively charge oxygen vacancy in HfO"2 is found to undergo a symmetry breaking distortion to a C"2"v symmetry, driven by electron localization, which is consistent with the experimentally observed electron spin resonance signal. This completes the identity of the oxygen vacancy defect in HfO"2 and ZrO"2 as the active defect that affects ...
S.J. Clark, L. Lin, J. Robertson
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source
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
openaire +3 more sources