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Oxygen vacancy

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The atomic and electronic structure of Hf0.5Zr0.5O2 and Hf0.5Zr0.5O2:La films

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The bombardment with argon ions of the studied fi lms leads to oxygen vacancy generation in the near-surface layer. The oxygen vacancy concentrations in the bombarded films were evaluated from the comparison of experimental valence band photoelectron spectra with the theoretical ones calculated using the density functional theory..

Low power multilevel resistive switching in titanium oxide-based RRAM devices by interface engineering

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The higher forming voltage of the ATF devices is plausibly due to the lack of suf fi cient oxygen vacancies. This indicates that insertion of the oxygen vacancy-rich TiO x layer remarkably reduced the forming voltages.

Electrophoretic deposition and characterization of self-doped SrTiO3 thin films

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These shifts are as a result of the presence of Ti 3+ and oxygen vacancies in blue STO in comparison to the pure one. The oxygen vacancy increases the strength of the equilibrium electron density and consequently pushes the Fermi. FESEM images of the top-view and cross-section morphology of STO powder deposited at different voltages of and 50 V.. The valence band position of pure STO and blue STO-450 samples are shown in Figure 6d.

Blue TiO2 nanotube arrays as semimetallic materials with enhanced photoelectrochemical activity towards water splitting

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The photocurrent of blue TiO 2 NTA is about 2 times larger than that of pristine TiO 2 NTA because the blue TiO 2 NTAs have a high amount of oxygen vacancy or Ti 3+ donor sites, which leads to an increase in visible light absorption, charge separation, and transport of the sample.

Preparation by forced hydrolysis method and the optical properties of Zn1−xNixO powder

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One of the possible rea- sons is that many oxygen va- cancies or defects are cre- ated at this annealing temper- ature. originates from oxygen vacancy or some defect: it possibly comes from the transition of an electron from the bottom of the conduction band to a deep level of the interstitial oxygen, or the oxygen depth level to the top of the valence band..

The resistive switching characteristics and electrical conduction mechanisms of memory devices based on nanocomposite

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Hu Et Al., The Effect Of Oxygen Vacancy On Switching Mechanism Of ZnO Resistive Switching Memory, Appl. 1–5, https://doi.org

Solid: Protons

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In the com- monly used Kro¨ger–Vink notation, this can be written as H 2 O þ O o x þ V dd o -2OH d o ½II where O x o is a lattice oxygen and V dd o is an oxygen vacancy.. A key issue though is the concentration of oxygen vacancies, as the intrinsic oxygen vacancy concentration arising from the Frenkel and Schottky mechanisms discussed earlier is too low to generate significant water uptake and in turn generate fast ionic conductivity.

N doping of TiO2 nanocrystal for efficient photodegradation of organic pollutants under ultraviolet and visible light irradiation

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Significantly enhanced visible light photocatalytic efficiency of phosphorus doped TiO 2 with surface oxygen vacancies for ciprofloxacin degradation: Synergistic effect and intermediates analysis. Enhanced visible light photocatalytic activity of N-doped TiO 2 in relation to single-electron- trapped oxygen vacancy and doped-nitrogen. doi: 10.1016/j.ssi . doi: 10.1016/j.catcom .

Effect of Neodymium and Transition Metals Co-doped on Structural, Optical and Magnetic Properties of BiFeO3 Materials

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repository.vnu.edu.vn

Moreover, the shift of E-3 and E-8 modes to higher frequency reveals the increase of local lattice distortion and the formation of oxygen vacancy due to substitution of the Ni, Co dopant at the B site [7, 31]. The appearance of a prominent additional band around ∼ 1000 – 1350 cm −1 in co-doped samples can be assigned to the two-phonons Raman scattering in BFO labeled as 2A 4 , 2E 8 and 2E 9 [30].

First-principles Calculations on Electronic Properties of LaNiO3 in Solid Oxide Fuel Cell Cathodes

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Such electronic reconstructions could be important as they are tightly linked with the formation of oxygen vacancy and the conduction of oxygen ions, which greatly affect the operation of the fuel cell. octahedra rotated in bulk LaNiO 3, alternating the electronic structure [5, 6]. As a result of the induced strain at the cathode-electrolyte interface, such octahedral rotations can be enhanced or suppressed.

Improving the gas sensing property of WO3 nanomaterials

000000254867.pdf

dlib.hust.edu.vn

From an electronic point of view, an oxygen vacancy causes the increase of the electronic density on the metallic (W) adjacent cations, leading to the formation of donor-like states slightly below the edge of the conduction band of the oxide, which acquires semiconducting properties [29]. Structural model of the WO3 grain surface.

Electrostatic Solid-State Capacitors

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Yttria-stabilized zirconia (YSZ) components, material well known as oxygen vacancy conductor at high tem- peratures, unfortunately do not show any marked double- layer capacitance below 400 1 C.. Rubidium silver iodide (RbAg 4 I 5 ) was employed in the low-voltage electrochemical ‘Hypercap’ capacitor from Technautics Corporation, Cleveland, in the early 1990s.. The energy storage in solid-state capacitors may in- volve electrochemical redox processes as in batteries..

Summary of PhD Thesis: Diffusional and electrical properties of oxide materials with fluorite structure

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Vacancy diffusion coefficient. 3.7 shows that the diffusion coefficient increases with the increasing temperature and it decreases with an increase in dopant concentration. The dopant concentration dependence generates from the influence of cation barrier on the vacancy-oxygen ion exchange.. The increase of dopant concentration promotes the number of the cation barriers with high energy and that prevents the vacancy mi- gration process..

NỒNG ĐỘ CÂN BẰNG VACANCY TRONG HỢP KIM THAY THẾ A - B KHI CÓ NGUYÊN TỬ C ĐIỀN KẼ

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Sự biến thiên của nồng độ cân bằng vacancy trong hợp kim khi có nguyên tử điền kẽ có thể lí giải như sau:. Với trường hợp nồng độ hạt điền kẽ nhỏ, khi nồng độ hạt điền kẽ tăng lên thì nồng độ cân bằng vacancy giảm là vì mạng càng được xếp chặt hơn, các nút càng khó dời chỗ hơn để tạo thành vacancy..

Effect of Fe substitution on the partial oxidation of methane to syngas over La0.7Sr0.3Co1−yFeyO3−δ perovskites

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was achieved through the oxidation of cations in the B site or oxygen ion vacancy formation.

Oxygen Evolution

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As a general rule, a linear correlation exists between the metal–oxygen bond strength and the electrode potential where oxygen ad- sorption on the metal surface commences. Usually, because the M–O bond is stronger than the O–O bond, oxygen adsorption starts at lower anodic potentials than the standard electrode potential of the O 2 electrode. These phenomena are also observed in the case of hydrogen and (foreign) metal deposition..

Modifed high-fow nasal cannula oxygen therapy versus conventional oxygen therapy in patients undergoing bronchoscopy: A randomized clinical trial

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HFNC oxygen therapy is applied to both nostrils, and the nar- rowing of the lumen influences the flow in the nostril in which the bronchoscope is inserted. Table 3 Comparison of vital signs between the modified high‑flow nasal cannula oxygen and the conventional oxygen therapy groups. 3 Comparison of vital signs and FiO 2 between the modified HFNC and COT groups. Therefore, we designed a modified HFNC that has a single cannula.

Clinical effects of embryos culture in low oxygen concentration

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Live birth rate in 5% oxygen group was (46.51%) higher than (32.55%) in 20% oxygen group but no significantly. Conclusion: Clinical pregnancy rate on day 5 in 5% oxygen group was higher than that in 20% oxygen group. Live birth rate in 5%. oxygen group was higher than in 20% oxygen group but no significantly.. Pregnancy rate. Live birth rate: Low oxygen concentration..

The use of oxygen reserve index in one-lung ventilation and its impact on peripheral oxygen saturation, perfusion index and, pleth variability index

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Table 4 Time-dependent correlations between oxygen reserve index (ORi) with peripheral oxygen saturation (SpO 2.

Singlet oxygen generation from poly[4-diacetoxyiodo]styrene and hydrogen peroxide

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The mechanism underlying generation of singlet oxygen and reaction scope was examined.. Key words: Hydrogen tetroxide, oxidation, peroxyiodane, polymer-supported hypervalent iodine, singlet oxygen. an unstable, energy-rich active oxygen species, was first reported in the 1960s..