| DOI | Trouver le DOI : https://doi.org/10.1016/j.nimb.2013.08.042 |
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| Auteur | Rechercher : Zhang, Huai-Ruo1; Rechercher : Egerton, Raymond (Ray)1; Rechercher : Malac, Marek1 |
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| Affiliation | - Conseil national de recherches du Canada
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| Format | Texte, Article |
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| Sujet | irradiation damage; MgO; EELS; TEM |
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| Résumé | 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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| Date de publication | 2013-09-25 |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Numéro NPARC | 21271841 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | b5a22712-0573-4d6c-853f-b3e2a1a71de8 |
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| Enregistrement créé | 2014-04-23 |
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| Enregistrement modifié | 2020-04-22 |
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