Bulk, overlap and surface effects of swift heavy ions in CeO2
Rymzhanov R.A. Volkov A.E. Skuratov V.A.
January 2025Elsevier B.V.
Journal of Nuclear Materials
2025#604
Formation of tracks of swift heavy ions decelerating in the electronic stopping regime in CeO2 was studied, combining the Monte Carlo code TREKIS with molecular dynamics. We show that strong lattice disordering (melting) followed by structure recovery form finally a damaged ion track consisting of a discontinuous crystalline region in CeO2. Normal ion impacts result in appearance of spherical crystalline hillocks on CeO2 surface. The solid-vacuum interface strongly suppresses the recrystallization of the near-surface layers, forming conically shaped tracks with several tens of nanometers lengths. Grazing ion irradiation induces intensive material expulsion from the surface forming finally grooves surrounded by nanohillocks. The processes of surface nanostructures formation is similar to those observed previously in CaF2 which has the similar crystalline structure, however requires much longer recrystallization time. Recent experimental data confirm the simulation results.
Cerium oxide , Electronic excitation , Nanostructuring , Nuclear fuel , Swift heavy ion
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Joint Institute for Nuclear Research, Joliot-Curie 6, Moscow Region, Dubna, 141980, Russian Federation
The Institute of Nuclear Physics, Ibragimov St. 1, Almaty, 050032, Kazakhstan
PN. Lebedev Physical Institute of the Russian Academy of Sciences, Leninskij pr., 53, Moscow, 119991, Russian Federation
National Research Nuclear University MEPhI, Moscow, Russian Federation
Dubna State University, Dubna, Russian Federation
Joint Institute for Nuclear Research
The Institute of Nuclear Physics
PN. Lebedev Physical Institute of the Russian Academy of Sciences
National Research Nuclear University MEPhI
Dubna State University
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