Radiolytic purification of CaO by electron beams |
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| Authors: | K A Mkhoyan J Silcox M A Mcguire F J Disalvo |
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| Institution: | 1. School of Applied and Engineering Physics , Cornell University , Ithaca, NY 14853, USA kam55@cornell.edu;3. School of Applied and Engineering Physics , Cornell University , Ithaca, NY 14853, USA;4. Department of Physics , Cornell University , Ithaca, NY 14853, USA;5. Department of Chemistry and Chemical Biology , Cornell University , Ithaca, NY 14853, USA |
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| Abstract: | Analysis of the electron energy loss spectra of core-level electronic transitions, O K- and Ca L2,3-edges, combined with composition-sensitive annular dark field imaging shows that under electron-beam irradiation portlandite can easily be transformed into calcium oxide. The low-loss region of the energy loss spectra measured before and after transformation also supports the observations. Two possible mechanisms of the electron beam-induced modification of the specimen, radiolysis and knock-on damage, are discussed, and it was found that radiolysis is likely to be the primary mechanism for this transformation of Ca(OH)2 into CaO, while some knock-on damage is also expected. |
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