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Title: Nano-scale quasi-melting of alkali-borosilicate glasses under electron irradiation
Authors: M�bus G.
Ojovan M.
Cook S. 
Tsai J.
Yang G.
Issue Date: 2010
Publisher: ScienceDirect
Citation: M�bus G., Ojovan M., Cook S., Tsai J., Yang G. (2010). Nano-scale quasi-melting of alkali-borosilicate glasses under electron irradiation. Journal of Nuclear Materials 396 : 264-271. ScholarBank@NUS Repository.
Abstract: Quasi-melting of micro- and nano-samples during transmission electron microscope irradiation of glassy materials is analysed. Overheating and true melting by the electron beam is shown not to be an explanation due to the ultra-sharp boundary between transformed and intact material. We propose that the observed fluidisation (quasi-melting) of glasses can be caused by effective bond breaking processes induced by the energetic electrons in the electron beam. The bond breaking processes modify the effective viscosity of glasses to a low activation energy regime. The higher the electron flux density the lower is the viscosity. Quasi-melting of glasses at high enough electron flux densities can result in shape modification of nano-sized particles including formation of perfect beads due to surface tension. Accompanying effects, such as bubble formation and foil bending are revisited in the light of the new interpretation. � 2009 Elsevier B.V. All rights reserved.
Source Title: Journal of Nuclear Materials
ISSN: 223115
DOI: 10.1016/j.jnucmat.2009.11.020
Appears in Collections:Staff Publications

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