Results 31 to 40 of about 83,687 (300)

Influence of order-disorder transitions on oxygen permeability through selected nonstoichiometric perovskite-type oxides [PDF]

, 1993
New results on the oxygen permeability of perovskite-type oxides SrCo0.8B'0.2O3¿¿ (with B'=Cr, Fe, Co and Cu) and La0.6Sr0.4CoO3¿¿ are presented. The occurrence of order-disorder transitions at elevated temperatures (790¿940°C) in these phases has been ...
Bouwmeester, H.J.M., Burggraaf, A.J., Doorn, R.H.E. van, Kruidhof, H.   +3 more
core   +5 more sources

Revealing the mechanism of oxygen vacancy defect for CO2 adsorption and diffusion on CaO: DFT and experimental study

Journal of CO2 Utilization
The calcium looping is a promising technology to achieve industrial CO2 capture, and the introduction of oxygen vacancy can promote the CO2 capture reactivity of CaO-based sorbents.
Xianyao Yan, Chenyu Duan, Shuihua Yu, Bing Dai, Chaoying Sun, Huaqiang Chu   +5 more
doaj   +1 more source

First-principles analysis of the effects of oxygen, vacancies, and their complexes on the screw dislocation motion in body-centered cubic Nb

Journal of Materials Research and Technology
Some solute atoms induce strengthening and embrittlement in body-centered cubic refractory metals. Especially, interstitial oxygen produces remarkable strengthening effects in Nb, wherein the yield stress of oxygen-doped Nb alloys is more than twice that
Tomohito Tsuru, Ivan Lobzenko, Shigenobu Ogata, Wei-Zhong Han   +3 more
doaj   +1 more source

Role of Sr doping and external strain on relieving bottleneck of oxygen diffusion in La2−x Sr x CuO4−δ

Scientific Reports, 2022
In many complex oxides, the oxygen vacancy formation is a promising route to modify the material properties such as a superconductivity and an oxygen diffusivity.
Sohee Park, Young-Kyun Kwon, Mina Yoon, Changwon Park   +3 more
doaj   +1 more source

Roles of Oxygen Vacancies of CeO₂ and Mn-Doped CeO₂ with the Same Morphology in Benzene Catalytic Oxidation

Molecules, 2021
Mn-doped CeO2 and CeO2 with the same morphology (nanofiber and nanocube) have been synthesized through hydrothermal method. When applied to benzene oxidation, the catalytic performance of Mn-doped CeO2 is better than that of CeO2, due to the difference ...
Min Yang, Genli Shen, Qi Wang, Ke Deng, Mi Liu, Yunfa Chen, Yan Gong, Zhen Wang   +7 more
doaj   +1 more source

Vacancies and vacancy-oxygen complexes in silicon: Positron annihilation with core electrons [PDF]

Physical Review B, 1998
Various point defects in silicon are studied theoretically from the point view of positron annihilation spectroscopy. Properties of a positron trapped at a single vacancy, divacancy, vacancy-oxygen complexes $({\mathrm{VO}}_{n}),$ and divacancy-oxygen complex are investigated. In addition to the positron lifetime and positron binding energy to defects,
Kuriplach, Jan, Morales Aramburo, Álvaro Luis, Dauwe, Charles, Segers, Danny, Sob, M.   +4 more
openaire   +3 more sources

Giant photoinduced lattice distortion in oxygen-vacancy ordered SrCoO2.5 thin films

, 2018
Despite of the tremendous efforts spent on the oxygen vacancy migration in determining the property optimization of oxygen-vacancy enrichment transition metal oxides, few has focused on their dynamic behaviors non-equilibrium states.
Bousquet, Eric, Ge, Chen, Guo, Haizhong, He, Xu, Jin, Kuijuan, Li, Yuelin, Meng, Sheng, Tao, Ye, Wen, Haidan, Yu, Can, Zhang, Bingbing, Zhao, Jiali   +11 more
core   +1 more source

Localized versus itinerant states created by multiple oxygen vacancies in SrTiO3

New Journal of Physics, 2015
Oxygen vacancies in strontium titanate surfaces (SrTiO _3 ) have been linked to the presence of a two-dimensional electron gas with unique behavior. We perform a detailed density functional theory study of the lattice and electronic structure of SrTiO _3
Harald O Jeschke, Juan Shen, Roser Valentí   +2 more
doaj   +1 more source

Femtosecond visualization of oxygen vacancies in metal oxides [PDF]

Science Advances, 2020
Femtosecond spectroscopy combined with first-principle calculations enables determination of oxygen-vacancy configuration.
Zhang, Xinping, Tang, Fawei, Wang, Meng, Zhan, Wangbin, Hu, Huaxin, Li, Yurong, Friend, Richard H, Song, Xiaoyan   +7 more
openaire   +2 more sources

Inverse change in positron lifetimes of vacancies in tungsten by binding of interstitial impurity atoms to a vacancy: A first-principles study

Nuclear Materials and Energy, 2023
First-principles calculations related to defect complexes formed from a monovacancy and multiple interstitial impurity atoms (hydrogen, carbon, nitrogen, and oxygen atoms) in tungsten were performed.
Atsushi Yabuuchi
doaj   +1 more source