Электронный каталог

Статья

Samadov, S.F.
Gamma-Irradiation-Induced Defects and Thermally Driven Recovery in ZrB&sub(2) / S.F.Samadov, E.Popov, A.A.Sidorin, O.S.Orlov, N.V.Tiep, M.N.Mirzayev, [a.o.]. – Text : electronic // Materials Chemistry and Physics. – 2026. – Vol. 353. – P. 132107. – URL: https://doi.org/10.1016/j.matchemphys.2026.132107. – Bibliogr.: 94.

This study investigates the reaction of ZrB&sub(2) ceramics to high-dose gamma irradiation and subsequent thermal treatment in terms of defect formation and recovery mechanisms, which are important for harsh reactor environments. ZrB&sub(2) powders were irradiated with &sup(60)Co gamma rays at a total absorbed dose in the range of 1500–3000 kGy, and then annealed at 1173 K. Surface and near-surface analyses (SEM, TEM/HRTEM, FTIR) indicate the formation of a thin oxygen-rich layer and moderate particle coarsening after irradiation; after annealing, partial removal of hydroxyl/oxide-related features and relaxation of microstrain are observed. Positron-based DB/EMD measurements show that irradiation leads to an increase in vacancy-type defects (VB, VZr, and their clusters), while after thermal treatment these defects decrease toward the reference state, which is consistent with thermally assisted defect recombination. First-principles (TCDFT/DFT) calculations confirm these trends: in defective structures, shifts in the Fermi level and weakening of Zr4d–B2p hybridization are observed, while changes in the elastic constants are only moderate. Overall, the results show that ZrB&sub(2) exhibits noticeable defect resilience within the investigated gamma dose range, and post-irradiation annealing can partially reduce the induced damage. These findings are informative for the initial selection of materials, but they cannot be considered as a comparative ranking with existing first-wall candidates; application-oriented final conclusions require direct comparative studies under the same conditions.



Спец.(статьи,препринты) = С 349.1 - Действие излучения на материалы$
ОИЯИ = ОИЯИ (JINR)2026