·538· 北京科技大学学报 2001年第6期 4 Albert A.Adjattor and Gregory L Griffin:Aerosol Syn- 7 Joachim Muller.Kurt Dehnicke.Preparation and Vibra- thesis of Aluminum Nitride Powder Using Metalorganic tional Spectra of Trimeric Diethylaluminum Azide, Reactants.J Amer Cerma Soc,1992,75(12):3209 [EtAIN,).Z Anorg Allg Chem,1966(5-6):348 5 Ye Yaping,Zhou Keyan.Preparation of Nanometric Par- 8 David C B,Richard T.Organometallic Azides as Precur- ticles of Aluminum Nitride by Pyrolysis of Diethylal- sors for Aluminum Nitride Thin Films.Chemistry of Mar- uminun Azide .Journal of Science and Technology Beijing terials,1989(1):119 1997,4(4):43 9曹立宏，欧阳世鑫，汤字凌.氮化铝纳米粉末的氧化 6 Price artin M.Diethylaluminum azide.J Organamet 特性的研究.硅酸盐学报，1995,23(1)：50 Chem,l966(5):584 Aerosol Sythesis of Aluminum Nitride Powder Using Diethylaluminun Azide YE Yaping,WANG Lihua",Jiang Li,Qian Weilan,Shigeharu Kittaka I)Applied Science School,UST Beijing Beijing 100083 2)Okayama University of Science,Okayama700-0081 ABSTRACT A aerosol process is described for making nanometric Aluminum Nitride powder by pyrolysis of single compound Diethylaluminun Azide.The process can produce spherical AIN powder with mean par- ticle diameter ranging from 10 to 50nm at the temperature of furnace as lower as 500-700C.The generated amorpous AlN powder is characterized by a BET surface area of 103m/g and is very reactive toward moisture. A new way of preparing nanometric powder of AlN is found. KEY WORDS aluminum nitride:aerosol reactor,nanometric;diethylaluminun azide (上接第525页) Relationship between Luminescence and Crystal Structure of Eu"doped Fluorite CAO Lin.LI Dianchao2.WU Changfeng 2 YU Lixin 1)Department of Materials Physics,UST Beijing,Beijing 10008,China 2)Jilin University,Chaoyang Campus,Changchun 130026,China ABSTRACT According to the relationship between luminescent properties and local symmetry of Eu",to- gether with the site symmetry of symmetrically equivalent points in space group,it can be inferred that there are mainly two kinds of emission centers,which have the C.or C site symmetry respectively,in fluorite:Eu" system.The Euion requires charge compensation,because it enters the cubic site in a heterovalent substitu- tion for the Ca ion.The charge-compensating defects,such as the predominant interstitial F,,influence the local environment of the Eu"ions and,in particular,modify the site symmetry.The existence of F,rou nd the Eu"ion reduces the O,symmetry to C.or C,which breaks the parity selection rules and promotes the lum- inescence of fluorite:Eu"samples. KEY WORDS Eu";fluorite;luminescence;crystal structure一 53 8 . 北 京 科 技 大 学 学 报 2 0 1 年 第 ` 期 4 A I加rt A . A dj at or an d G er 昌。 口 L G ir 伍 n : A帅邹l sy 卜 ht e s i s o f A lum 七n切. N itr de P ow d e r U s ign M e回。 电an ic 助朗t扣吐5 . J A m er Ce n n a S oc , 19 9 2 , 7 5( 12 ) : 3 209 5 eY ay Pin g , hZ o u K e y an . rP eP ar 毗on of N a n o 们明廿i c Par - ti c l e s o f A I切m l n 切nI N i川d e by yP or ly : 1 5 o f D i e hyt lal - um in u n 八Z id e . J o切 nr al of s e i enc e 助d eT c ho o l o gy B e ij i n g 19 7 , 4( 4 ) : 4 3 6 P ir e e art i n M . D i e ht y l a lum m 切m 涵de . J O 电 an 的 e t C h e m , 19 6 6 (5) : 5 84 7 J oac h im M 山e r, K u rt D e恤 i c k e . P r. par 磁 io n an d V i b r a . t i o 钊目 SeP ct ar of T r汕e ir c D i e hyt alt 帅 m切叭 A以d e , 【E标A NI 3 ] , . Z A 加gr A I地C he nt , 19 66 (5~6 ) : 348 8 D via d C B , R ic 加趁d .T 0 电叻o m e at l li e A 滋d es as rP e c -ur s o sr for A I帅in 切m N i州 d e hT i n Fi阮。 . C h e m i s ytr o f M ar - et ir ias , 198火l ) : 1 19 9 曹立 宏 , 欧阳世 右 , 汤 宇凌 . 氮化铝纳米粉末 的氧化 特性的研究 . 硅酸盐学 报 , 19 5 , 23 ( 1) : 50 A e r o s o l S yt h e s i s o f A lum i n um N iitr d e P o wd e r U s ing D i e ht y l a lunr i n un zA id e YE aYP ing x), 环“ N G L ih au ,) iaJ gn ixL 气 Qia n 肠 ial l)n, hS ige h ar “ 犬`湘无矛) l )柳 p l闹 S e l亡川姆 Se h o l , U S T B o ij 吮声吧 ij 吨 10 0 8 3 2冲匕W . . U in v e rs ity o f s e ie 即低O ak y幽a 7 0 0刁 0 8 1 A B S T R A C T A aer o os l Pr以津 5 15 de s icr be d ofr m ak 加9 n a n o m e tr ic A I切rn in 切rn N itr de PO w de r 勿 yP or ly is o f s in g l e c o m Po nU d D i e ht y lal um l n un A iz d e . hT e Por c e s s c an 拼O du c e s Ph e ir c al A NI P ow d e r w iht 咖an Pa-r t i e l e d i am e 姗 r an 目 n g 丘。 m 10 ot 5 0 nm at hte t eln pe ar h 犷 e of 加功a c e as l o w er a s 5 0 0一 7 0 0℃ . hT e g e ne at e d am o rp o u s A IN Po w d e r i s e h ar a tC e ir eZ d by a B E T s ur af e o are a o f 10 3 m 馆 an d i s v e ry are e ti v e t ow adr m o l s tU re . A n e w aw y o f reP Piar n g an o m e itr e Po dw er o f A lN i s of un d . K E Y W O R D S a l切tn m 切滋 n itr de ; ae or os l re ac ot r, n a n O enI itr ;c d i e ht y lal uln i n即 画de (上接第 5 2 5 页 》 R e l iat o n s h iP b e wt e en L um in e s e e n e e an d C yr s alt Str u c恤 e o f E份 + d 0 P e d F olu ir et 侧 O Liln 毛 IL D’la 肛 h ao Z气 甲 U hc a雌户馆 ’ 气 y U L韶沪 l ) D印州 m ent o f M a“ 打目, P妙 s i e , , U S T B e ij吨 , B o ij吨 l的0 83 , C h 比a 2拼lin 山i v e sr iyt, Ch ao y an g C的 P su . Ch . 姗比 un I 3 0() 2 6 . Ch山以 A B S T R A C T A e e o dr in g ot het er l a ti姗脚 b e wt e en l um in e即 en t rP ol 冲irt e s an d l o e al s扣肚 m e坷 o f E才 + , ot - ge het r w iht het s i et s y n u n e灯 o f s y n ” ” e itr c a lly eq in va len t op int s in s Pa c e 母o uP , it e an be in fe r e d ht at ht er ar e m a in ly wt o 侧吮d s o f e m i s s i o n e e nt e sr , w h i c h ha ve ht e C ; 、 or C 3 、 s i et s y n u n e仰 er s Pe e t ive l y, i n fl u ior t e: E u , + sy st e m . Th e E口 ` ion r e iqu r e s e h ar g e c o m ep n s a ti o n , 加c a u s e it e n t e r s ht e c ub ic is et in a he t e or va le nt , ub ist -ut ti o n for het C扩 + ion . hT e e ha 铭e 一 e o mP e n s at ign d e fe e t s , s uc h a s het rP e do m i n a n t int e r ist t i a l F: . in ifu en e e ht e l o e a l en v ior mn e nt o f ht e E矿 + i o n s an d , i n Part i e ul ar, m o id fy het 幼et yS n u n e你 Th e e x i s et n e e o f F扩 or u n d ht e uE , + ion r e du e e s het o h s y n u n e ytr t o C 4 , or C , , , w h i e h ber ak s het P州yt s e l e e it o n ulr e s an d Por m o et s het l um · ien s c e cn e o f fl u o ir et : Eu , + s arn Pl e s . K E Y W O R D S E u 3十 : if uo irt e ; luj m i n e s e ecn e ; e yr s以 s utr e trU e