Comparison of deuterium retention for ion-irradiated and neutron-irradiated tungsten

Yasuhisa Oya, Masashi Shimada, Makoto Kobayashi, Takuji Oda, Masanori Hara, Hideo Watanabe, Yuji Hatano, Pattrick Calderoni, Kenji Okuno

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44 Citations (Scopus)

Abstract

The behavior of D retention for Fe 2+-irradiated tungsten with a damage of 0.025-3 dpa was compared with that for neutron-irradiated tungsten with 0.025 dpa. The D 2 thermal desorption spectroscopy (TDS) spectra for Fe 2+-irradiated tungsten consisted of two desorption stages at 450 and 550 K, while that for neutron-irradiated tungsten was composed of three stages and an addition desorption stage was found at 750 K. The desorption rate of the major desorption stage at 550 K increased as the displacement damage increased due to Fe 2+ irradiation increasing. In addition, the first desorption stage at 450 K was found only for damaged samples. Therefore, the second stage would be based on intrinsic defects or vacancy produced by Fe 2+ irradiation, and the first stage should be the accumulation of D in mono-vacancy and the activation energy would be relatively reduced, where the dislocation loop and vacancy is produced. The third one was found only for neutron irradiation, showing the D trapping by a void or vacancy cluster, and the diffusion effect is also contributed to by the high full-width at half-maximum of the TDS spectrum. Therefore, it can be said that the D 2 TDS spectra for Fe 2+-irradiated tungsten cannot represent that for the neutron-irradiated one, indicating that the deuterium trapping and desorption mechanism for neutron-irradiated tungsten is different from that for the ion-irradiated one.

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Mathematical Physics
  • Condensed Matter Physics

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    Oya, Y., Shimada, M., Kobayashi, M., Oda, T., Hara, M., Watanabe, H., Hatano, Y., Calderoni, P., & Okuno, K. (2011). Comparison of deuterium retention for ion-irradiated and neutron-irradiated tungsten. Physica Scripta T, T145, [014050]. https://doi.org/10.1088/0031-8949/2011/T145/014050