Strain screening by mobile oxygen vacancies in SrTiO3

2010 ◽  
Vol 96 (25) ◽  
pp. 251901 ◽  
Author(s):  
Yongsam Kim ◽  
Ankit S. Disa ◽  
Timur E. Babakol ◽  
Joel D. Brock
Keyword(s):  
Oxygen Vacancies ◽  
Strain Screening ◽  
Mobile Oxygen

scholarly journals Oxygen Vacancies in Perovskite Oxide Piezoelectrics

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5596
Author(s):  
Marina Tyunina
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Chemical Reactions ◽  
Oxygen Vacancies ◽  
Perovskite Oxide ◽  
Semiconductor Physics ◽  
Physical Conditions ◽  
Ferroelectric Behavior ◽  
Piezoelectric Performance ◽  
Mobile Oxygen

The excellent electro-mechanical properties of perovskite oxide ferroelectrics make these materials major piezoelectrics. Oxygen vacancies are believed to easily form, migrate, and strongly affect ferroelectric behavior and, consequently, the piezoelectric performance of these materials and devices based thereon. Mobile oxygen vacancies were proposed to explain high-temperature chemical reactions half a century ago. Today the chemistry-enabled concept of mobile oxygen vacancies has been extrapolated to arbitrary physical conditions and numerous effects and is widely accepted. Here, this popular concept is questioned. The concept is shown to conflict with our modern physical understanding of ferroelectrics. Basic electronic processes known from mature semiconductor physics are demonstrated to explain the key observations that are groundlessly ascribed to mobile oxygen vacancies. The concept of mobile oxygen vacancies is concluded to be misleading.

A-site deficient perovskite: the parent for in situ exsolution of highly active, regenerable nano-particles as SOFC anodes

2015 ◽  
Vol 3 (20) ◽  
pp. 11048-11056 ◽  
Author(s):  
Yifei Sun ◽  
Jianhui Li ◽  
Yimin Zeng ◽  
Babak Shalchi Amirkhiz ◽  
Mengni Wang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Oxygen Vacancies ◽  
Electronic Conductivity ◽  
Nano Particles ◽  
Highly Active ◽  
A Site ◽  
Mobile Oxygen

Introduction of A-site deficiency on Ni-doped LaSrCrO3 anodes helps form highly mobile oxygen vacancies and remarkably enhances Ni nanoparticle reducibility, and significantly increases electronic conductivity and catalytic activity.

scholarly journals Persistent and partially mobile oxygen vacancies in Li-rich layered oxides

Nature Energy ◽  
2021 ◽  
Author(s):  
Peter M. Csernica ◽  
Samanbir S. Kalirai ◽  
William E. Gent ◽  
Kipil Lim ◽  
Young-Sang Yu ◽  
...  
Keyword(s):  
Oxygen Vacancies ◽  
Layered Oxides ◽  
Mobile Oxygen

Toward Switchable Photovoltaic Effect via Tailoring Mobile Oxygen Vacancies in Perovskite Oxide Films

2016 ◽  
Vol 8 (50) ◽  
pp. 34590-34597 ◽  
Author(s):  
Chen Ge ◽  
Kui-juan Jin ◽  
Qing-hua Zhang ◽  
Jian-yu Du ◽  
Lin Gu ◽  
...  
Keyword(s):  
Oxygen Vacancies ◽  
Photovoltaic Effect ◽  
Oxide Films ◽  
Perovskite Oxide ◽  
Mobile Oxygen

Conditions for atomic imaging of mullite

1989 ◽  
Vol 47 ◽  
pp. 418-419
Author(s):  
T. A. Epicier ◽  
G. Thomas
Keyword(s):  
Oxygen Vacancies ◽  
High Resolution Electron Microscopy ◽  
Ceramic Materials ◽  
Work Conditions ◽  
Real Space ◽  
Potential Candidate ◽  
Silicate Mineral ◽  
Resolution Electron ◽  
The Subject ◽  
Aluminium Silicate

Mullite is an aluminium-silicate mineral of current interest since it is a potential candidate for high temperature applications in the ceramic materials field.In the present work, conditions under which the structure of mullite can be optimally imaged by means of High Resolution Electron Microscopy (HREM) have been investigated. Special reference is made to the Atomic Resolution Microscope at Berkeley which allows real space information up to ≈ 0.17 nm to be directly transferred; numerous multislice calculations (conducted with the CEMPAS programs) as well as extensive experimental through-focus series taken from a commercial “3:2” mullite at 800 kV clearly show that a resolution of at least 0.19 nm is required if one wants to get a straightforward confirmation of atomic models of mullite, which is known to undergo non-stoichiometry associated with the presence of oxygen vacancies.Indeed the composition of mullite ranges from approximatively 3Al2O3-2SiO2 (referred here as 3:2-mullite) to 2Al2O3-1SiO2, and its structure is still the subject of refinements (see, for example, refs. 4, 5, 6).

Investigation of Some Characterizations of Black TiO\(_2\) Nanotubes Via Spectroscopic Methods

2019 ◽  
Vol 29 (2) ◽  
pp. 189 ◽  
Author(s):  
Tho Truong Nguyen ◽  
Thi Minh Cao ◽  
Hieu Van Le ◽  
Viet Van Pham
Keyword(s):  
Water Splitting ◽  
Oxygen Vacancies ◽  
Light Response ◽  
Nanotube Arrays ◽  
Spectroscopic Methods ◽  
Visible Light Response ◽  
Uv Visible ◽  
Visible Reflectance ◽  
Splitting Effect ◽  
Anodization Method

The black TiO\(_2\) with substantial Ti\(^3+\) and oxygen vacancies exhibit an excellent photoelectrochemical water-splitting performance due to the improved charge transport the extended visible light response. In this study, black TiO\(_2\) nanotube arrays synthesized by the anodization method, and then, they have been investigated some characterizations by spectroscopic methods such as UV-visible reflectance (UV-vis DRS), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, and photoluminescence spectrum. The results showed that some highlighted properties of the black TiO2 nanotube arrays and they could apply for water-splitting effect.

Oxygen Vacancies in Zirconium Oxide as the Blue Luminescence Centers and Traps Responsible for Charge Transport

2020 ◽  
Author(s):  
Damir R. Islamov ◽  
Vladimir A. Gritsenko ◽  
Timofey V. Perevalov ◽  
Vladimir Sh. Aliev ◽  
Alexander P. Yelisseyev ◽  
...  
Keyword(s):  
Charge Transport ◽  
Zirconium Oxide ◽  
Oxygen Vacancies ◽  
Blue Luminescence ◽  
Luminescence Centers

Oxidized indium with transformable dimensions for CO2 electroreduction toward formate aided by oxygen vacancies

2020 ◽  
Vol 4 (7) ◽  
pp. 3726-3731
Author(s):  
Fenghui Ye ◽  
Jinghui Gao ◽  
Yilin Chen ◽  
Yunming Fang
Keyword(s):  
Crucial Role ◽  
Oxygen Vacancies ◽  
Value Added ◽  
Promising Technique ◽  
Co2 Electroreduction ◽  
Value Added Products

Electroreduction of CO2 into value-added products is a promising technique in which the structure of the catalyst plays a crucial role.

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