TY - JOUR
T1 - Ion irradiation-induced amorphization and nano-crystal formation in garnets
AU - Utsunomiya, S.
AU - Wang, L. M.
AU - Yudintsev, S.
AU - Ewing, R. C.
N1 - Funding Information:
The authors thank the staff of the HVEM/IVEM-Tandem Facility at Argonne National Laboratory for assistance during the ion irradiation experiments. S.U. thanks the staff of the Electron Microbeam Analysis Laboratory at University of Michigan and Chris Palenik for helping with EMPA. S.U. also thanks Professor Takashi Murakami at the University of Tokyo. This work was supported by US DOE, Office of Basic Energy Sciences under grant DE-FGO2-97ER45656.
PY - 2002/6
Y1 - 2002/6
N2 - The radiation susceptibility of garnet structure types (A3B2(XO4)3, Ia3d, Z = 8) has been examined by 1.0 MeV Kr2+ irradiation with in situ transmission electron microscopy over the temperature range of 50-1070 K. The target garnets included five natural garnets: almandine, andradite, pyrope, grossular and spessartine, and five synthetic garnets incorporating various contents of actinides. The synthetic garnets were silicates (N-series) and ferrate-aluminates (G-series). The critical amorphization temperature (Tc), above which amorphization does not occur, were determined to be 1050 K for N77, 1130 K for N56, 1100 K for G3, 890 K for G4 and 1030 K for andradite. Tc of the synthetic garnets increased with increasing mass density of the target and as the electronic-to-nuclear stopping power ratio decreased. During ion irradiation of the G3 garnet at a temperature of 1023 K near the Tc, nano-crystals were produced in which the unit-cell parameter of the original garnet was halved (∼0.64 nm) as a result of a radiation-induced recrystallization process, without evidence for ordering of the cations.
AB - The radiation susceptibility of garnet structure types (A3B2(XO4)3, Ia3d, Z = 8) has been examined by 1.0 MeV Kr2+ irradiation with in situ transmission electron microscopy over the temperature range of 50-1070 K. The target garnets included five natural garnets: almandine, andradite, pyrope, grossular and spessartine, and five synthetic garnets incorporating various contents of actinides. The synthetic garnets were silicates (N-series) and ferrate-aluminates (G-series). The critical amorphization temperature (Tc), above which amorphization does not occur, were determined to be 1050 K for N77, 1130 K for N56, 1100 K for G3, 890 K for G4 and 1030 K for andradite. Tc of the synthetic garnets increased with increasing mass density of the target and as the electronic-to-nuclear stopping power ratio decreased. During ion irradiation of the G3 garnet at a temperature of 1023 K near the Tc, nano-crystals were produced in which the unit-cell parameter of the original garnet was halved (∼0.64 nm) as a result of a radiation-induced recrystallization process, without evidence for ordering of the cations.
UR - http://www.scopus.com/inward/record.url?scp=0036608597&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0036608597&partnerID=8YFLogxK
U2 - 10.1016/S0022-3115(02)00802-4
DO - 10.1016/S0022-3115(02)00802-4
M3 - Article
AN - SCOPUS:0036608597
VL - 303
SP - 177
EP - 187
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
SN - 0022-3115
IS - 2-3
ER -