湖北大学学报（自然科学版）
湖北大學學報（自然科學版）
호북대학학보（자연과학판）
2009年
4期
388-392
,共5页
Bi_(4-x)Nd_xTi_3O_(12)%稀土掺杂%光谱学特性
Bi_(4-x)Nd_xTi_3O_(12)%稀土摻雜%光譜學特性
Bi_(4-x)Nd_xTi_3O_(12)%희토참잡%광보학특성
Bi_(4-x)Nd_xTi_3O_(12)%rare-earth doping%characteristic of spectroscopy
使用自助熔生长法生长Bi_(4-x)Nd_xTi_3O_(12)(BNdT,x=0,0.5,0.85)单晶,研究了Nd掺杂对BNdT单晶光谱学特性的影响.常温拉曼光谱结果表明:随Nd含量的增加,BNdT中TiO_6八面体振动模式有所增强;Nd含量增加到一定值,BNdT单晶可能在常温下发生铁电一顺电相转变;位于(Bi_2O_2)~2+层的Bi-O振动模式随Nd掺杂量增加而减弱,表明Nd含量较低时,Nd~(3+)离子仅仅取代伪钙钛矿层的Bi~(3+)离子,当Nd含量较高时,有部分Nd~(3+)离子开始替换(Bi_2O_2)~(2+)层中的Bi~(3+)离子.紫外-可见光谱结果表明,BNdT单晶具有间接带隙跃迁的特点,而且单晶的禁带宽度随Nd掺杂含量的增加而减小.
使用自助鎔生長法生長Bi_(4-x)Nd_xTi_3O_(12)(BNdT,x=0,0.5,0.85)單晶,研究瞭Nd摻雜對BNdT單晶光譜學特性的影響.常溫拉曼光譜結果錶明:隨Nd含量的增加,BNdT中TiO_6八麵體振動模式有所增彊;Nd含量增加到一定值,BNdT單晶可能在常溫下髮生鐵電一順電相轉變;位于(Bi_2O_2)~2+層的Bi-O振動模式隨Nd摻雜量增加而減弱,錶明Nd含量較低時,Nd~(3+)離子僅僅取代偽鈣鈦礦層的Bi~(3+)離子,噹Nd含量較高時,有部分Nd~(3+)離子開始替換(Bi_2O_2)~(2+)層中的Bi~(3+)離子.紫外-可見光譜結果錶明,BNdT單晶具有間接帶隙躍遷的特點,而且單晶的禁帶寬度隨Nd摻雜含量的增加而減小.
사용자조용생장법생장Bi_(4-x)Nd_xTi_3O_(12)(BNdT,x=0,0.5,0.85)단정,연구료Nd참잡대BNdT단정광보학특성적영향.상온랍만광보결과표명:수Nd함량적증가,BNdT중TiO_6팔면체진동모식유소증강;Nd함량증가도일정치,BNdT단정가능재상온하발생철전일순전상전변;위우(Bi_2O_2)~2+층적Bi-O진동모식수Nd참잡량증가이감약,표명Nd함량교저시,Nd~(3+)리자부부취대위개태광층적Bi~(3+)리자,당Nd함량교고시,유부분Nd~(3+)리자개시체환(Bi_2O_2)~(2+)층중적Bi~(3+)리자.자외-가견광보결과표명,BNdT단정구유간접대극약천적특점,이차단정적금대관도수Nd참잡함량적증가이감소.
Bi_(4-x)Nd_xTi_3O_(12) (BNdT,x= 0,0. 5,0. 85) single crystals were grown by self-flux method.Effect of Nd substitution on their characteristic of spectroscopy were investigated. Raman spectra of BNdT single crystals in room temperature indicate that TiO_6 vibrational mode increases with increasing Nd content(x). When Nd content increases to a certain value, BNdT single crystals probably undergo a ferroelectric-paraelectric phase transition. Bi-O vibrational mode in (Bi_2O_2)~(2+)layers gradually becomes weak with increasing Nd content (x), indicating that Nd~(3+) ions only substitute with Nd~(3+) in the pseudo-perovskite layers at low Nd-doping level, whereas some Nd~(3+) ions begin to incorporate into (Bi_2O_2)~(2+) layers at higher Nd-substituted content. UV-Vis transmittance spectra of BNdT single crystals reveal that they have an indirect band gap. E_g decreases with the increase of Nd content (x).
