Vol23 No.5 罗世永等：氧和铝在氧化铝中的自扩散参数评估 ·417· AlO.J Am Ceram Soc,1983,76(8):c130 gyo Kyokaishi,1977,85(10):54 5 Oishi Y,Kingery W D.Self-diffusion of Oxygen in Single 12 Rasmussen JJ,Kingery WD.Effect of Dopants on the De- Crystal and Polycrystalline Aluminum Oxide.J Am Cer- fect Structure of Single-crystal Aluminum Oxide.J Am am Soc,,1960,33(2:480 Ceram Soc,1983,53(8):436 6 Reed D J,Wuensch B.J.Ion-probe Measurement of Oxy- 13 Sakaguchi I,Srikanth V,Ikegami T,et al.Grain Boundary gen Self-diffusion in Single-crystal Al.O,.J Am Ceram Diffusion of Oxygen in Alumina Ceramics.J Am Ceram S0c,1980,63(1-2:88 Soc,1995,78(9):2557 7 Reddy K PR,Cooper A R.Oxygen Diffusion in Sapphire. 14 Lagerlof K P D,Mitchell T E,Heuer A H.Lattice Dif- J Am Ceram Soc,1982,65(12):634 fusion Kinetics in Undoped and Impurity-doped Sapphire 8 Catlow C R A,James R,Mackrodt W C,et al.Defect En- (a-Al,O;):A Dislocation Loop Annealing Study.J Am ergies in a-Al:O,and Rutile TiO2.Phys Rev B,1982,25 Ceram Soc,,1989,72(11):2159 (2:1006 15 Paladino E,Kingery W D.Aluminum ion Diffusion in 9 Haneda H,Monty C.Oxygen Self-diffusion in Mag- Aluminum Oxide.J Chem Phys,1962,17(1):957 nesium-or Titanium-doped Alumina Single Crystals.J 16 Jones T P,Coble R L.,Mogab C J.Defect Diffusion in Am Ceram Soc,1989,72(7):1153 Single Crystal Aluminum Oxide.J Am Ceram Soc,1969, 10 Hollenberg G W,Gordon R S.Effect of Oxygen Partial 52(6):331 Pressure on the Creep of Polycrystalline Al:O,Doped with 17 Dienes G J,Welch D O,Fisher C R,et al.Shell-model Cal- Cr,Fe,or Ti.J Am Ceram Soc,1973,56 (3):140 culation of Some Point-defect Properties in a-Al,O.Phys 11 Oishi Y,Ando K,Matsuhiro K.Self-diffusion Coefficient ReyB,1975,11(80):3060 of Oxygen in Vapor-grown Single-crystal Alumina.Yo- Assessment of Self-diffusion Parameters in Alumina Single Crystals LUO Shiyong,ZHANG Jiayun Metallurgy School,UST Beijing.Beijing 100083,China ABSTRACT The oxygen ion and aluminum ion self-diffusion parameters in alumina single crystals were re- viewed and assessed,and the diffusion mechanism was analyzed.The results suggest that:(1)In the tempera- ture range from 1770 to 2100 K,oxygen self-diffusion coefficient in single crystal of undoped Al,O,with im- purities level of 30x10-500x10-(the content of Mg as well as Ti should be less than 30x10),under an oxygen partial pressure less than 1.0x10 Pa,the formula of self-diffusion confficient and temperature can be obtained.The diffusivity of the oxygen self-diffusion in single crystal of undoped AlO,is insensitive to the variation ofoxygen partial pressure and the diffusion direction.(2)In the temperature range from 1943 to 2178 K,aluminum ion diffusion coefficient in polycrystalline aluminum oxide is about 10-sto 10-4m/s,the acti- vation energy is about 477 kJ/mol.(3)The major impurity species in Al2O,single crystal are TiO,and MgO. Doping with titania will decrease oxygen self-diffusivity and doping with magnesium will increase oxygen self-diffusivity.Since the contents of other impurity species dissolved in AlO,are low,the influence of their presence on the oxygen self-diffusivity is not of significance.(4)The diffusion of aluminum and oxygen ions occurs through a vacancy mechanism. KEY WORDS self-diffusion;assessment of parameters;alumina single crystalsV bL 2 3 N 0 . 5 罗世永等 : 氧和铝 在氧化铝 中的 自扩散参数评 估 一 41 7 - A 1 2 q . J A」11 Ce raj m S oc , 1 98 3 , 7 6 ( 8) : e l 30 5 o i s h i Y, K in ge yr W D . S e l-f d i fl汕s i o n o f o xy 朗 n i n s ign l e C yr s alt an d P o l y c汀 s at l lin e A lum in um O劝 d e . J Am C e r - am S o e , 19 60 , 3 3 ( 2) : 4 80 6 eR e d D J , Wu e n s e h B · J . I o n一or be M e as uer m e Dt o f ox y - ge n S e l -f d i伪 s i o n in S in g l e 一 e yr s at l A 1 2 0 3 . 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J A m C e r别旧 S o c , 1 96 9 , 5 2 ( 6 ) : 3 3 1 1 7 D i e n e s G J , W七l e h D O , F i s he r C 民 et a l . S h e l l 一 m o d e l C al - e u lat i o n o f s o m e P o int 刁e fe e t Por eP rt i e s in a一 1 2 0 3 . hP y s eR v B , 1 9 7 5 , 1 1 (8 0 ) : 30 6() A s s e s s m e n t o f S e l -f d i fu s i o n P a r a m e t e r s i n A l u m i n a S i n g l e C yr s t a l s L U O hS iyo gn, Z瓦祖刃 G iJ刃 声 u n M e at l l u理汀 S比 0 0 1 , U S T B e ij ing , B e ij ign l 0 0() 8 3 , C h in a A B S T R A C T Th e o xy g e n i o n an d al um l n 切 rn ion s e l-f d iif ls i o n P田旧幻n e te rs in a l um in a s in g l e e ry s at l s w e re re - vi e w e d an d as se s s e d , 阶d het 由n汕s ion m e hc 耐sm w a s an ly ez d . Th e er s u lst s u g g e st ht a t : ( l ) nI het et m P ear - t叨er arn g e fr o m 17 7 0 t o 2 10 0 K , o x y g e n s e l-f id 月h s i o n e o e if e i ent i n s ign l e e yr s at l o f nU d o ep d A l 2 0 , w iht 而 - P iur t i e s l e v e l o f 3 0 x 10 一` ~ 5 0 0 x 10 一 ` (ht e e o nt e nt o f M g a s w e ll a s iT sh o u ld b e l e s s ht an 3 0 x l 0 一` ) , 助d e r an o 叮g en p顽 a l erP s s uer l e s s ht an 1 . o x l o , p a , het fo mur l a o f s e l-f id 而 s ion e o n if e ien t an d t em Pe ar t 犷 e e an b e o b at l n e d . Th e id if ls ivi yt o f ht e o xy g e n s e l-f id 肋 s i o n in s in g l e e yr s at l o f un d o ep d A 1 2 O 3 1 5 in s e n s it i v e ot ht e v a ir at ion o f o xy g en P art i a l Per s sur e an d ht e d in汕s ion d ier e t i o n . ( 2 ) nI het t e娜ep n 山叮e r an ge fr o m l 9 4 3 ot Z 1 7 8 K, a l um in um ion id 伪 s i o n e oe if e i ent in Po l y e yr s at llin e a l um 刃。 U比 n o x id e i s ab o ut l o 一 ” t o l o 一 ’ ` m V s , ht e a e it - v iat on e n e r gy 1 5 ab o ut 47 7 kJ m/ 0 1 . ( 3) Th e m aj o r 加P iur yt s Pe c i e s in A 1 2 0 , s in gl e e yr s alt aer iT 0 2 an d M g o . D o Pin g w iht t i at nL l a w ill de e er a s e o xy 罗n s e l-f d i伪 s ivi yt an d dop in g w iht m a g n e s i um w i ll in e er as e o xy g e n s e l-f id if 巧 ivi .yt S in e e ht e e o nt ent s o f o ht er 加P iur yt s P e e i e s id s s o l v e d i n A 1 2 0 3 aer l ow , het i n fl u en e e o f ht e ir Per s en e e on ht e o xy 罗n s e l-f d i加 s i v iyt 1 5 on t o f s ign iif e an e e . ( 4 ) hT e d i肋 s ion o f a l um in 功m an d o x y g e n i o sn o e e usr 廿ir o u hg a v ac an e y m e e h 田吐s m . K E Y W O R D S s e l-f id 肋 s ion : a s s e s sm e nt o f Pa r 田n e et r s : a l um in a s in g le cyr s at l s