| DOI | Resolve DOI: https://doi.org/10.1016/j.nimb.2013.08.042 |
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| Author | Search for: Zhang, Huai-Ruo1; Search for: Egerton, Raymond (Ray)1; Search for: Malac, Marek1 |
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| Affiliation | - National Research Council of Canada
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| Format | Text, Article |
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| Subject | irradiation damage; MgO; EELS; TEM |
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| Abstract | Magnesium oxide (MgO) has been of interest for several decades as a promising tunable broadband laser due to its vacancy defects (color centers). In this work we introduced color centers into MgO nanocube by electron irradiation in a transmission electron microscope (TEM). Square nano-holes were formed from the electron-exit face using 100 and 300 keV electrons, and a broad O-vacancy (color-center) absorption peak around 4.1-6.6 eV was observed by valence-electron energy-loss spectroscopy (VEELS). We investigated the mechanism of MgO damage by high-energy electron beams. The hole formation is believed to involve a mixed removal of diatomic MgO molecules as well as Mg and O species in stoichiometric proportion. Observations using high-resolution transmission electron microscopy (HRTEM) and VEELS suggest that bulk O-vacancies are generated near the electron-exit face, due to the forward momentum transferred from fast-electron collisions and the Coulomb attraction of negative O-ions by the positively charged MgO surface. |
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| Publication date | 2013-09-25 |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 21271841 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | b5a22712-0573-4d6c-853f-b3e2a1a71de8 |
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| Record created | 2014-04-23 |
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| Record modified | 2020-04-22 |
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