Reductive Silylation of Polyoxovanadate Surfaces using Mashima’s Reagent

2021 ◽  
Author(s):  
Sourav Chakraborty ◽  
Ellen Matson
Keyword(s):  
Defect Formation ◽  
Oxygen Defect ◽  
Quantitative Formation

Here, we present the first example of reductive silylation for oxygen defect formation at the surface of a polyoxometalate. Upon addition of 1,4,-bis(trimthylsilyl)dihydropyrazine (Pyz(SiMe3)2) to [V6O7(OMe)12]-1, quantitative formation of the...

PL study of oxygen defect formation in ZnO nanorods

2009 ◽  
Vol 40 (2) ◽  
pp. 296-298 ◽  
Author(s):  
C. Chandrinou ◽  
N. Boukos ◽  
C. Stogios ◽  
A. Travlos
Keyword(s):  
Defect Formation ◽  
Zno Nanorods ◽  
Oxygen Defect

scholarly journals Boron-Oxygen Defect Formation Rates and Activity at Elevated Temperatures

2016 ◽  
Vol 92 ◽  
pp. 791-800 ◽  
Author(s):  
Phillip Hamer ◽  
Nitin Nampalli ◽  
Ziv Hameiri ◽  
Moonyong Kim ◽  
Daniel Chen ◽  
...  
Keyword(s):  
Elevated Temperatures ◽  
Defect Formation ◽  
Oxygen Defect

scholarly journals Nanoscale oxygen defect gradients in UO2+x surfaces

2019 ◽  
Vol 116 (35) ◽  
pp. 17181-17186 ◽  
Author(s):  
Steven R. Spurgeon ◽  
Michel Sassi ◽  
Colin Ophus ◽  
Joanne E. Stubbs ◽  
Eugene S. Ilton ◽  
...  
Keyword(s):  
Defect Formation ◽  
Fuel Cycle ◽  
Surface Oxidation ◽  
Excess Oxygen ◽  
Interstitial Oxygen ◽  
Oxygen Defect ◽  
Near Surface ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Actinide Oxides

Oxygen defects govern the behavior of a range of materials spanning catalysis, quantum computing, and nuclear energy. Understanding and controlling these defects is particularly important for the safe use, storage, and disposal of actinide oxides in the nuclear fuel cycle, since their oxidation state influences fuel lifetimes, stability, and the contamination of groundwater. However, poorly understood nanoscale fluctuations in these systems can lead to significant deviations from bulk oxidation behavior. Here we describe the use of aberration-corrected scanning transmission electron microscopy and electron energy loss spectroscopy to resolve changes in the local oxygen defect environment in UO2+x surfaces. We observe large image contrast and spectral changes that reflect the presence of sizable gradients in interstitial oxygen content at the nanoscale, which we quantify through first-principles calculations and image simulations. These findings reveal an unprecedented level of excess oxygen incorporated in a complex near-surface spatial distribution, offering additional insight into defect formation pathways and kinetics during UO2 surface oxidation.

Controlling Oxygen Defect Formation and Its Effect on Reversible Symmetry Lowering and Disorder-to-Order Phase Transformations in Nonstoichiometric Ternary Uranium Oxides

2019 ◽  
Vol 58 (9) ◽  
pp. 6143-6154 ◽  
Author(s):  
Gabriel L. Murphy ◽  
Chun-Hai Wang ◽  
Zhaoming Zhang ◽  
Piotr M. Kowalski ◽  
George Beridze ◽  
...  
Keyword(s):  
Phase Transformations ◽  
Defect Formation ◽  
Oxygen Defect ◽  
Uranium Oxides

A DFT+U Study of the Oxygen Defect Formation in (Sr1-xPrx)2FeO4

2021 ◽  
Vol MA2021-01 (45) ◽  
pp. 1795-1795
Author(s):  
Nicholas Szaro ◽  
Salai Cheettu Ammal ◽  
Andreas Heyden
Keyword(s):  
Defect Formation ◽  
Oxygen Defect

An ab initio study of the oxygen defect formation and oxide ion migration in (Sr1-xPrx)2FeO4±δ

2021 ◽  
Vol 515 ◽  
pp. 230602
Author(s):  
Nicholas A. Szaro ◽  
Salai Cheettu Ammal ◽  
Fanglin Chen ◽  
Andreas Heyden
Keyword(s):  
Ab Initio ◽  
Defect Formation ◽  
Oxygen Defect ◽  
Ab Initio Study ◽  
Ion Migration ◽  
Oxide Ion

scholarly journals Oxygen aggregation kinetics, thermal donors and carbon-oxygen defect formation in silicon containing carbon and tin

2015 ◽  
Vol 118 (1) ◽  
pp. 015704 ◽  
Author(s):  
T. Angeletos ◽  
E. N. Sgourou ◽  
A. Andrianakis ◽  
A. Diamantopoulou ◽  
A. Chroneos ◽  
...  
Keyword(s):  
Defect Formation ◽  
Aggregation Kinetics ◽  
Oxygen Defect

Xenon ion irradiation of superconducting YBa2Cu3O7 thin films

1990 ◽  
Vol 48 (4) ◽  
pp. 92-93
Author(s):  
H. Watanabe ◽  
B. Kabius ◽  
B. Roas ◽  
K. Urban
Keyword(s):  
Defect Formation ◽  
Ion Irradiation ◽  
High Resolution Electron Microscopy ◽  
Structural Disorder ◽  
Flux Lines ◽  
Pinning Effect ◽  
Magnetic Flux Lines ◽  
Resolution Electron ◽  
Radiation Induced ◽  
Induced Defects

Recently it was reported that the critical current density(Jc) of YBa2Cu2O7, in the presence of magnetic field, is enhanced by ion irradiation. The enhancement is thought to be due to the pinning of the magnetic flux lines by radiation-induced defects or by structural disorder. The aim of the present study was to understand the fundamental mechanisms of the defect formation in association with the pinning effect in YBa2Cu3O7 by means of high-resolution electron microscopy(HRTEM).The YBa2Cu3O7 specimens were prepared by laser ablation in an insitu process. During deposition, a substrate temperature and oxygen atmosphere were kept at about 1073 K and 0.4 mbar, respectively. In this way high quality epitaxially films can be obtained with the caxis parallel to the <100 > SrTiO3 substrate normal. The specimens were irradiated at a temperature of 77 K with 173 MeV Xe ions up to a dose of 3.0 × 1016 m−2.

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