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EFTEM Study of Phase Separations in Borosilicate Glasses Under Electron Beam Irradiation

Phase-separation in glasses used for nuclear waste vitrification can results in degradation of the chemical durability of the glasses. Thus, the subject has been studied extensively using various techniques, such as electron microscopy [1], nuclear magnetic resonance [2], and electron energyloss spectroscopy (EELS) etc [3]. Borosilicate glass that has been chosen as a waste form for most nuclear waste compositions in most countries that have high-level radioactive wastes is among the most widely studied glasses [4]. Phase separation in glasses under irradiation is always a concern [4]. So far, little is known about the effects of cations with multiple valence states, like Fe on the phase separation. Direct evidences showing element redistribution after the phase separation are needed.