Thermal conductivity of Al2O3 irradiated with swift heavy ions


Rymzhanov R.A. Akzhunussov A. Volkov A.E. Ibrayeva A.D. Skuratov V.A.
October 2022Elsevier Ltd

Nuclear Materials and Energy
2022#33

Thermal transport in α-Al2O3 irradiated with 167 MeV Xe ions is studied within direct method based on the Fourier law implemented into classical molecular dynamics. Formation of defective regions as a result of ion passages is described using the original multiscale approach developed in previous works. Degradation of the thermal conductivity coefficient of single-crystalline alumina with ion fluence shows reasonable agreement with the experimental thermoreflectance data. The applied method demonstrated good applicability in the considered case and allowed to distinguish effects of discontinuous crystalline tracks on thermal conductivity of the alumina target. It was surprisingly observed that a nanometric highly damaged core of swift heavy ion tracks strongly affect the heat transport in the irradiated material, which is in contradiction with classical Rayleigh model.

Electronic excitation , Irradiation , Molecular dynamics , Swift heavy ion , Thermal conductivity

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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
P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Leninskij pr., 53, Moscow, 119991, Russian Federation
Centre for HRTEM, Nelson Mandela University, Port Elizabeth, South Africa
National Research Nuclear University MEPhI, Kashirskoye sh., 31, Moscow, 115409, Russian Federation
Dubna State University, Universitetskay 19, Moscow Region, Dubna, 141980, Russian Federation
National Research Centre ‘Kurchatov Institute’, Kurchatov Sq. 1, Moscow, 123182, Russian Federation

Joint Institute for Nuclear Research
The Institute of Nuclear Physics
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
Centre for HRTEM
National Research Nuclear University MEPhI
Dubna State University
National Research Centre ‘Kurchatov Institute’

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