85MeV19F重离子辐照αCAl 2O3的空洞研究
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Key worÉheavy iom imdiati£"'tbemaImwaline-votd,p¹²Ø
1IntroductionÁ-AI203is m imPOEtant material used for theSmtwall d hSion macØm azui the windowsd laser and solarcells and for monitoring neMEW-zmdiation damÔe-Ue m-diation etTectsin Á-AL03iE12diated by high-fhBenee neu-trona,especially void nucleÉon phenomenon ,isa eur-rently intem86ng topic .Iwata,£ne d the authon-pm-diets the void formation in Á-AL0,and some other mated-als when the iETadiaing neutmn fIuence and poet irradi-ation annealing temperaumbdh exeeed the ceEtain value-or tlzmsholds and the voids gowmúúe increasing d theannealing tempeMureú£"the timatzold.1TzeÁ-A1203imdated by Ea hlMeV neutEWESof1.5Á1Omem-2and
3x1²CEn-2has been studied .Novoids wm detected
up toÉe poet iETsdiation MEnding tempmØum d 1éMBtmthepAl203imdiated by mum d 1.5x1om cm-2.
Nevenhele"'the voids with a mdiusof 0.7nm weeeob-sewed on the vA1203irradiated by mums d 3x1£"cm-2der the poet i¼,damn azmedins±850Ô{1].horder to determine the temperatUÓthreshold and tounde-stand the detailed evolution d void nucleation ÷×them¤Ree--ved Z48¤'"¤úerZREåS®'"£"ad byse--e M-£,Bge D.,.ae'"'mehemd qha{405¼,.ilzzht'7¤tz4¤.eta--e."85MeV "F IonsIrradiatedbyneding tempemtum,the present wort was motivated tostudy the dependeme d void nucleation oa the po±imdi-atioa annealing temperature for the vA1203in,dated by85MeV W F ions d 5.28Á1Ot6em-2that isequivalent tothe3Á1²cm-2netam-zirmdmuon.'IEe created voidswere examined by a poeitmn annihilaHon lifetime tech-niqueú"isa powedul tool for inveetiÁting the voids inmetals-instBlatomand other materials,especially forstudying the earty stage d void nucleationl2-51.h 11mEnx11mm xlmmvAl203R-cut mdecrystal samples wemused m the experiment .'IEe sampleswmimdiated by85MeV WF ions hm the HI-13tandemaccelerator .131e iÐadmuon fhzenee wØ528Á1Ot6cm-2that isequivalent to the neutron fhamee d 3x1²cma2.1Ee iR¤diatioa was performed at mom tenperattan.×Ee poet-inadmuon annealinsw"£OEEducted under
nitrogen atmosphem for40minutes fmmlÞæto1050tin step-d mt.11,e ddeem-zd vacancies and voidswere caETiedü,t
-nd Namal NaEd Sdeme F£"²m d chin¤(1õ½²£)64ù-Ø2650by a positmn lifetime technique .specãa were rneasumd at mom tempemtumafter iETad-o
aHon and annealingódiEerent temperatumby meme da eonventional BaFz fast-fastÞincidence pomuon l¤e6mspectrometer wiÉa time resolution d 2lops.Twoidenti-cal samples wemmangedÄa sandwich with a 0.8MBqpositmn source in the center-Ò2e lifetime spectm eachcontamed1.5x106C©muand wemmmlyzed with m LT
pmF±Ø[6l.Besides the soUEte eompone-'"'the measured
lifetime spectmwere fltted wiÉtwoor three lifetime eom-ponenu.¡Ee Etting variance was all less than1.3.
3Results and discussion1TEe lifemme spectm wemwellEndmth two lifetimemmponentsbelow450t and ,the third long-lifetime
Ømponent h"to be added above450É,othendse,tbefltting variance wasmacceptable.Ò2eobtmned lifeHmmTE ,r2and r,and their intensitie-12and I3(II+I2+I3=1)m shown in Fig.1"a haEZCHon of the poakm-
diation annealingtempemtum.Ò2e bulk iifetimhd poeiïns in Á-AI203is150pe[t;.h cm h seenÝ£m Fig .ltha the meastamd life-
time ÓIisdue Øpositron annihilaHon in the bulk and isalmoa independent d the annealing tempemtum.Nochmgesmmob-ewed in hup to tbe am-ding tempem-
tum d 450Ô,afterward ,hincreases wiÉthe incmminsof annealing tempemtuÓ.his ascribed tothe lifetime dmitmm tzappedathe Al vacancyclustem(VA1¤VAI)and Al-O vacancy clusters (VA1¤v£)below450Ô."Eelifetime of positmns trapped at the inner sUEface d voidsis about 5Þ"[7¤¤j.×EeEüfoÓ,above450tr2ism-
stBEned to be a weidzted average life6me of the poeitmnstrappedathe above-mentioned cluster-and thoee tmppedat the inner suzface of voids described below .'IEe in-
