Structural damage response of lanthanum and yttrium aluminate crystals to nuclear collisions and electronic excitation:Threshold assessment of irradiation damage  

作　　者：Yong Liu Xinqing Han Qing Huang Miguel L.Crespillo Peng Liu Eva Zarkadoula Xuelin Wang 

机构地区：[1]Institute of Frontier and Interdisciplinary Science and Key Laboratory of Particle Physics and Particle Irradiation(MOE),Shandong University,Qingdao 266237,China [2]Shanghai Institute of Applied Physics,Chinese Academy of Sciences(CAS),Shanghai 201800,China [3]Department of Materials Science&Engineering,University of Tennessee,Knoxville,TN 37996,United States [4]Materials Science&Technology Division,Oak Ridge National Laboratory,Oak Ridge,TN 37831,United States

出　　处：《Journal of Materials Science & Technology》2021年第31期95-107,共13页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.11875038 and 11775135);the National Laboratory of Heavy Ion Accelerator in Lanzhou;the State Key Laboratory of Nuclear Physics and Technology,Peking University;financial support from the Young Scholars Program of Shandong University;financial support from the Youth Innovation Promotion Association CAS(Grant No.2019262);supported by the U.S.Department of Energy,Office of Science,Basic Energy Sciences,Materials Sciences and Engineering Division;support from the University of Tennessee Governor’s Chair program。

摘　　要：A comparative analysis is performed on the structural damage response and associated mechanisms in lanthanum aluminate and yttrium aluminate crystals under various irradiation conditions by a combination of experimental and theoretical approaches.Under low-energy Au~+irradiation,the damage accumulation curve shows a higher damage rate for LaAlO_(3)crystals than YAlO_(3)crystals.The relatively low irradiation tolerance of LaAlO_(3)to the action of nuclear collisions is ascribed to the large amorphization cross-section and effective cross-section for defect-stimulated amorphization.Under swift Ar^(12+),Ni^(19+)and Kr^(17+)irradiation with different ion energies and velocities,the formed highly-disordered/amorphous latent tracks with different morphologies in pristine and predamaged crystals are discussed,and the corresponding electronic energy loss and lattice temperature thresholds are quantitatively determined.Compared to YAlO_(3),LaAlO_(3)exhibits lower sensitivity and higher damage tolerance to the electronic energy loss process,attributing to its relatively high recrystallization efficiency during the rapid quenching process.Furthermore,the introduction of lattice defects into LaAlO_(3)and YAlO_(3)crystals considerably enhances the sensitivity and intensity of thermal spike response to the electronic energy loss,and the induced effective modification of track morphologies demonstrates the synergistic effect between the electronic energy loss and pre-existing defects created by nuclear collisions.In this case,even under the action of electronic energy loss below the threshold,the lattice temperature in the nuclear-collision damaged crystalline system could still meet the criterion for track production.The irradiation energy deposited to atoms and induced lattice temperature evolution discussed in this work provide a deeper insight into the complex processes involved in irradiation-induced latent track behaviors.

关 键 词：Nuclear energy loss Electronic energy loss Synergistic effect Irradiation damage Latent ion track 

分 类 号：TQ133.3[化学工程—无机化工]