Abstract
Glass-ceramics have the potential to be the advanced nuclear wasteforms that can incorporate radioactive nuclides for a long-term geological disposal. In order to understand the He accumulation arising from long-term α-decay events, 10 keV in-situ TEM helium implantation experiments were carried out to examine the accumulation of helium bubbles in Gd2Ti2O7 borosilicate glass-ceramics. STEM analysis shows He accumulation in amorphous/crystalline ceramic matrix. Helium bubbles with an average bubble size of 1.2 nm were formed at a fluence of 1.1×1017 He/cm2 within the ceramic matrix. No helium bubbles were observed in either the glass matrix or glass-ceramic interfaces due to the higher He diffusion coefficient in glass. The helium bubbles preferred to accumulate near glass-ceramic interfaces and nucleate along ceramic grain boundaries.
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