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Here, we report a study on the radiation resistance enhancement of Gd 2 Zr 2 O 7  nanograin ceramics, in which amorphization, cell volume expansion, and multi‐stage helium (He) bubble formation are investigated and discussed. Gd 2 Zr 2 O 7  ceramics with a series of grain sizes (55‐221 nm) were synthesized and irradiated by 190 keV He ion beam up to a fluence of 5 × 10 17  ions/cm 2 . Both the degree of post irradiation cell volume expansion and the amorphization fraction appear to be size‐dependent. As the average grain size evolves from 55 to 221 nm, the degree of post irradiation cell volume expansion increases from 0.56% to 1.02%, and the amorphization fraction increases from 6.8% to 11.1%. Additionally, the threshold He concentrations (at.%) of bubbles at different formation stages and locations, including (a) bubbles at grain boundary, (b) bubble‐chains, and (c) ribbon‐like bubbles within the grain, are all found to be much higher in the nanograin ceramic (55 nm) compared with that of the submicron sample (221 nm). We conclude that grain boundary plays a critical role in minimizing the structural defects, and inhibiting the multi‐stage He bubble formation process.

Defect‐fluorite Gd 2 Zr 2 O 7 ceramics under helium irradiation: Amorphization, cell volume expansion, and multi‐stage bubble formation