Dependence of void nucleation on post-irradiation annealing temperature in α-Al₂O₃

Dependence of void nucleation on post-irradiation annealing temperature in α -Al 2 O 3 1 first-author 1 1 1 1 2 3 3 3 3 1 China Institute of Atomic Energy, P.O. Box 275-50, Beijing 102413 China Institute of Atomic Energy, P.O. Box 275-50, Beijing 102413 Advanced Science Research Center, JAERI, Ibaraki 319-11, Japan Advanced Science Research Center, JAERI, Ibaraki 319-11, Japan Department of Physics, Osaka University, Toyonaka, Osaka 560, Japan Department of Physics, Osaka University, Toyonaka, Osaka 560, Japan The evolution of void nucleation in α -Al 2 O 3 irradiated by En ≥ 1 MeV neutrons of 3×10 20 cm -2 and post-annealed from 100℃ to 1050℃ is studied by a positron annihilation lifetime technique. The void nucleation starts at 500℃. The radius of created voids is 0.31 nm and the number of voids increases with increasing annealing temperature from 550℃ to 750℃. Afterwards, the radius of voids increases rapidly and reaches 1.21nm at 1050℃. α -Al 2 O 3 Neutron irradiation Post annealing Evolution of void nucleation Positron lifetime technique References Fan Z G , Luo Q , Iwata T , Zhu S Y . Nucl Tech (in Chinese) , 1998 , 21 : 224 Nucl Tech (in Chinese) Brandtand W , Dupasquier A . Positron solid-state physics . Amesterdam : North-Holland , 1983 , 298 Positron solid-state physics Kuramoto E , Kitajima K , Hasegawa M . Phys Lett , 1981 , A86 : 311 Phys Lett Jensen K , Eldrup M , Singh B et al . J Phys , 1988 , F18 : 1091 J Phys Schaefer H , Forster M . Mater Sci and Eng , 1989 , A109 : 161 Mater Sci and Eng Kansy J . Nucl Instr Methods , 1996 , A374 : 235 Nucl Instr Methods Petersen K . In: Positron Solid-state Physics , 288 (See Ref.3) Positron Solid-state Physics Nieminen R M . In: Positron Solid-state Physics , 359 (See Ref.3) Positron Solid-state Physics Pells G P . Radiat Phys Chem , 1983 , 22 : 1053 Radiat Phys Chem Forster M . Dissertation . University of Stuttgart , 1991 . Dissertation O571.32 + , O77 + 4, TG156.2, O472 Supported in part by the National Natural Science Foundation (No.19835050) and Nuclear Industry Science Foundation (No.H7196BO116) 2000-08-07 2001-02-01 2021-02-05 2001 Nuclear Science and Techniques 1 12