Электронный каталог

Статья

Bessonov, V.
Controlling Subsurface Radiation Tolerance in Swift Heavy Ion Irradiated Ceramics / V.Bessonov, V.Skuratov, [a.o.]. – Text : electronic // Applied Surface Science. – 2026. – Vol. 725. – P. 165730. – URL: https://doi.org/10.1016/j.apsusc.2025.165730. – Bibliogr.: 99.

Swift heavy ion irradiation induces complex, depth-dependent damage in nuclear ceramics, challenging their radiation tolerance. Using Brillouin spectroscopy and optical reflectometry, we resolve micrometer-scale elastic, photoelastic, and strain profiles in MgAl&sub(2)O&sub(4) spinel irradiated with 710 MeV Bi ions at fluences of 6 × (10&sup(10)–10&sup(12)) ions/cm&sup(2) . We discover a subsurface reversal of radiation damage characterized by a swelling-to-compression transition: while near-surface elastic (C&sub(11), C&sub(22), C&sub(44)) and photoelastic (P&sub(12), P&sub(21)) constants decrease with fluence, they recover at deeper regions following the tapering of ion tracks and reduction of electronic stopping power (Se). At the highest fluence, overlapping tapered tracks form a composite of acoustically mismatched nanocrystalline and nano-amorphous phases, evidenced by the emergence of confined GHz longitudinal acoustic modes. This study reveals a self-healing densification mechanism driven by tapering track morphology and electronic stopping power which provides a new strategy for engineering depth-resolved tolerance in ceramics to extreme radiation.



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