Thermal conductivity of Al2O3 irradiated with swift heavy ions

被引：3
|
作者：
Rymzhanov, R. A. [1 ,2 ]
Akzhunussov, A. [1 ,2 ]
Volkov, A. E. [3 ,7 ]
Ibrayeva, A. D. [2 ,4 ]
Skuratov, V. A. [1 ,5 ,6 ]
机构：
[1] Joint Inst Nucl Res, Joliot Curie 6, Moscow 141980, Russia
[2] Inst Nucl Phys, Ibragimov St 1, Alma Ata 050032, Kazakhstan
[3] Russian Acad Sci, PN Lebedev Phys Inst, Leninskij pr 53, Moscow 119991, Russia
[4] Nelson Mandela Univ, Ctr HRTEM, Port Elizabeth, South Africa
[5] Natl Res Nucl Univ MEPhI, Kashirskoye sh, 31, Moscow 115409, Russia
[6] Dubna State Univ, Universitetskay 19, Moscow 141980, Russia
[7] Kurchatov Inst, Natl Res Ctr, Kurchatov Sq 1, Moscow 123182, Russia
来源：
NUCLEAR MATERIALS AND ENERGY | 2022年 / 33卷
关键词：
Electronic excitation; Swift heavy ion; Irradiation; Thermal conductivity; Molecular dynamics; MOLECULAR-DYNAMICS; TRANSPORT; SIMULATION; TRACKS; EVOLUTION; MODELS;
D O I：
10.1016/j.nme.2022.101267
中图分类号：
TL [原子能技术]; O571 [原子核物理学];
学科分类号：
0827 ; 082701 ;
摘要：
Thermal transport in alpha-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.
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页数：7
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