Ion-beam and electron-beam irradiation of synthetic britholite

S. Utsunomiya; S. Yudintsev; L. M. Wang; R. C. Ewing

doi:10.1016/S0022-3115(03)00327-1

Ion-beam and electron-beam irradiation of synthetic britholite

S. Utsunomiya, S. Yudintsev, L. M. Wang, R. C. Ewing

Research output: Contribution to journal › Article

46 Citations (Scopus)

Abstract

Britholite, ideally Ca_4-xREE_6+x(SiO₄) ₆O₂ (REE=rare earth elements), has the hexagonal structure of apatite, a candidate waste form for actinides. Two synthetic britholites: Ca_3.05Ce_2.38Fe_0.25Gd _5.37Si_4.88O₂₆ (N56) and Ca _3.78La_0.95Ce_1.45Zr_0.78Fe _0.14Nd_2.15Eu_0.50Si_6.02O ₂₆ (N88) (P63; Z=1) were irradiated with 1.0 MeV Kr²⁺ and 1.5 MeV Xe⁺ over the temperature range of 50-973 K. The process of ion irradiation-induced amorphization, including the effects of the target mass and the ion mass, and the recrystallization of amorphous domains due to ionizing irradiation were investigated. The critical amorphization temperature, T_c was determined to be 910 K for N56 (1.0 MeV Kr²⁺), 880 K for N88 (1.0 MeV Kr²⁺) and 1010 K for N88 (1.5 MeV Xe⁺). The sequence of increasing T_c correlates with the mass of the incident ion; whereas, the ratio of electronic to nuclear stopping power (ENSP) is inversely correlated with T_c. Electron irradiations were conducted on previously amorphized britholite (N56) with an electron flux of 1.07 × 10²⁵ e^-/m²/s. The ionizing radiation resulted in recrystallization at the absorbed dose of 6.2 × 10¹³ Gy. This result suggests that the ionizing radiation can induce recrystallization in silicate apatites, similar to that observed for phosphate apatite.

Original language	English
Pages (from-to)	180-188
Number of pages	9
Journal	Journal of Nuclear Materials
Volume	322
Issue number	2-3
DOIs	https://doi.org/10.1016/S0022-3115(03)00327-1
Publication status	Published - Nov 1 2003
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Materials Science(all)
Nuclear Energy and Engineering

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Utsunomiya, S., Yudintsev, S., Wang, L. M., & Ewing, R. C. (2003). Ion-beam and electron-beam irradiation of synthetic britholite. Journal of Nuclear Materials, 322(2-3), 180-188. https://doi.org/10.1016/S0022-3115(03)00327-1

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title = "Ion-beam and electron-beam irradiation of synthetic britholite",

abstract = "Britholite, ideally Ca4-xREE6+x(SiO4) 6O2 (REE=rare earth elements), has the hexagonal structure of apatite, a candidate waste form for actinides. Two synthetic britholites: Ca3.05Ce2.38Fe0.25Gd 5.37Si4.88O26 (N56) and Ca 3.78La0.95Ce1.45Zr0.78Fe 0.14Nd2.15Eu0.50Si6.02O 26 (N88) (P63; Z=1) were irradiated with 1.0 MeV Kr2+ and 1.5 MeV Xe+ over the temperature range of 50-973 K. The process of ion irradiation-induced amorphization, including the effects of the target mass and the ion mass, and the recrystallization of amorphous domains due to ionizing irradiation were investigated. The critical amorphization temperature, Tc was determined to be 910 K for N56 (1.0 MeV Kr2+), 880 K for N88 (1.0 MeV Kr2+) and 1010 K for N88 (1.5 MeV Xe+). The sequence of increasing Tc correlates with the mass of the incident ion; whereas, the ratio of electronic to nuclear stopping power (ENSP) is inversely correlated with Tc. Electron irradiations were conducted on previously amorphized britholite (N56) with an electron flux of 1.07 × 1025 e-/m2/s. The ionizing radiation resulted in recrystallization at the absorbed dose of 6.2 × 1013 Gy. This result suggests that the ionizing radiation can induce recrystallization in silicate apatites, similar to that observed for phosphate apatite.",

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AU - Utsunomiya, S.

AU - Yudintsev, S.

AU - Wang, L. M.

AU - Ewing, R. C.

PY - 2003/11/1

Y1 - 2003/11/1

N2 - Britholite, ideally Ca4-xREE6+x(SiO4) 6O2 (REE=rare earth elements), has the hexagonal structure of apatite, a candidate waste form for actinides. Two synthetic britholites: Ca3.05Ce2.38Fe0.25Gd 5.37Si4.88O26 (N56) and Ca 3.78La0.95Ce1.45Zr0.78Fe 0.14Nd2.15Eu0.50Si6.02O 26 (N88) (P63; Z=1) were irradiated with 1.0 MeV Kr2+ and 1.5 MeV Xe+ over the temperature range of 50-973 K. The process of ion irradiation-induced amorphization, including the effects of the target mass and the ion mass, and the recrystallization of amorphous domains due to ionizing irradiation were investigated. The critical amorphization temperature, Tc was determined to be 910 K for N56 (1.0 MeV Kr2+), 880 K for N88 (1.0 MeV Kr2+) and 1010 K for N88 (1.5 MeV Xe+). The sequence of increasing Tc correlates with the mass of the incident ion; whereas, the ratio of electronic to nuclear stopping power (ENSP) is inversely correlated with Tc. Electron irradiations were conducted on previously amorphized britholite (N56) with an electron flux of 1.07 × 1025 e-/m2/s. The ionizing radiation resulted in recrystallization at the absorbed dose of 6.2 × 1013 Gy. This result suggests that the ionizing radiation can induce recrystallization in silicate apatites, similar to that observed for phosphate apatite.

AB - Britholite, ideally Ca4-xREE6+x(SiO4) 6O2 (REE=rare earth elements), has the hexagonal structure of apatite, a candidate waste form for actinides. Two synthetic britholites: Ca3.05Ce2.38Fe0.25Gd 5.37Si4.88O26 (N56) and Ca 3.78La0.95Ce1.45Zr0.78Fe 0.14Nd2.15Eu0.50Si6.02O 26 (N88) (P63; Z=1) were irradiated with 1.0 MeV Kr2+ and 1.5 MeV Xe+ over the temperature range of 50-973 K. The process of ion irradiation-induced amorphization, including the effects of the target mass and the ion mass, and the recrystallization of amorphous domains due to ionizing irradiation were investigated. The critical amorphization temperature, Tc was determined to be 910 K for N56 (1.0 MeV Kr2+), 880 K for N88 (1.0 MeV Kr2+) and 1010 K for N88 (1.5 MeV Xe+). The sequence of increasing Tc correlates with the mass of the incident ion; whereas, the ratio of electronic to nuclear stopping power (ENSP) is inversely correlated with Tc. Electron irradiations were conducted on previously amorphized britholite (N56) with an electron flux of 1.07 × 1025 e-/m2/s. The ionizing radiation resulted in recrystallization at the absorbed dose of 6.2 × 1013 Gy. This result suggests that the ionizing radiation can induce recrystallization in silicate apatites, similar to that observed for phosphate apatite.

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