The structural, mechanical and chemical stability properties of HEG and YIG in response to α-irradiation

Ceramic materials with excellent radiation resistance stability play an indispensable role in the treatment of nuclear waste. This article uses spark plasma sintering (SPS) to synthesize high-entropy (HE) Y-0.6 Gd-0.6 Sm (0.6) Eu (0.6) Dy (0.6) Fe-5 O-12 (HEG) and traditional garnet Y-1.2 Nd-1.8 Fe-5 O-12 (YIG). Studied the effects of 2 MeV He2+ irradiation (1 x 10(14)ions/cm(2) - 1 x 10(17) ions/cm(2)) on the crystal structure, mechanical properties, and chemical stability of ceramics. Research shows that the surface of YIG becomes completely amorphous under similar to 30dpa irradiation. Under irradiation at similar to 30dpa, HEG underwent a small amount of amorphization (with an amorphization rate of 38 %), maintaining the structure of garnet, and the lattice expansion rate of HEG caused by irradiation was lower than that of YIG. After irradiation, the mechanical properties of HEG were improved, while YIG's hardness decreased due to its amorphous state. Radiation has almost no effect on the chemical stability of HEG, and its long-term release mechanism is dominated by diffusion. This study identified HEG as an ideal candidate substrate for immobilizing high-radioactive waste (HLW) the perspective of radiation resistance.