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Meeting Materials Science & Technology 2020
Symposium Thermodynamics of Materials in Extreme Environments
Presentation Title Helium Irradiation of Gd2Zr2O7 Defect-fluorite Ceramics: Interfacial Phenomena and Radiation Resistance
Author(s) Zhangyi Huang, Jianqi Qi, Xiaofeng Guo, Tiecheng Lu, Di Wu
On-Site Speaker (Planned) Di Wu
Abstract Scope Gd2Zr2O7 ceramics with different grain sizes from nanoscale to submicron scale (55 – 634 nm) were synthesized and irradiated at room temperature under helium ions (190 keV) with dose up to 5 1017 ions/cm2. The pre- and post-irradiation samples were carefully studied using GIXRD, SEM, HRTEM and AFM as the grain size and degree of irradiation vary, in which amorphization, cell volume expansion, helium bubble formation, lattice distortion and surface blistering phenomena were interpreted and discussed. The results suggest grain boundary plays a critical role in minimizing the structural and morphological defects and inhibiting the multi–stage He bubble formation. Moreover, thenanograin samples have better radiation resistance and are more stable compared with submicron Gd2Zr2O7.


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