稀土掺杂P_2O_5-Al_2O_3-BaO玻璃的制备及其结构研究  

The preparation and structure study of rare earth P_2O_5-Al_2O_3-BaO glass

作　　者：陆春华[1] 孟献丰[1] 许仲梓[1] 张其土[1] 

机构地区：[1]南京工业大学材料科学与工程学院,南京210009

出　　处：《光学技术》2006年第3期371-374,共4页Optical Technique

基　　金：江苏省自然科学基金项目资助(BT2004121);教育部跨世纪优秀人才项目资助;江苏省高校自然科学基金项目资助(03kjb430046)

摘　　要：稀土掺杂磷酸盐玻璃具有优异的光学和光谱特性,在激光介质、有色滤光材料等领域中有着重要的应用。在P2O5_Al2O3_BaO_Sm2O3(PABS)玻璃形成能力研究的基础上,借助MAS NMR、红外光谱等分析手段,研究了玻璃的结构、玻璃组成与热处理等对玻璃结构的影响。结果表明:不同组成PAB(S)玻璃的31P MAS NMR谱在-20ppm^-25ppm范围内均存在单一的特征信号峰,对应于磷氧多面体[PO4]的Q2型结构;在18ppm、-12ppm和-36ppm处27Al的MAS NMR谱的三个特征信号峰分别对应于27Al的[AlO5][、AlO6]、[AlO6]配位结构,稀土离子的掺入以及热处理均使得[AlO6]向[AlO5]转变;玻璃的网络结构主要由Q2型[PO4]、[AlO5]和[AlO6]构成,并P_O_P、P_O_Al的形式相连接。玻璃在1383 cm-1处出现的吸收峰可能是玻璃结构中形成了P_O_Sm键所致。The rare earth phosphate glasses have been widely applied in many fields such as laser media and filter glass materials for their potential spectra and optical characteristics. The structure characteristics and the effect of the composition were investigated by MAS NMR and FT-IR on the basis of glass-forming ability research of P2O5-Al2O3-BaO-Sm2O3 （PABS）systems. The ^31p MAS NMR spectra for the six glasses had a single isotropie peak varied from - 20ppm to 25ppm, indicating that Q^2 were the dominant P sites in the glasses studied, and the Sm2O3 content and the heat treatment appeared to have no substantial effect on the phosphorus structural unit. The ^27Al MAS NMR spectrum measured for the PABS glass shows that the aluminum ions present in the glass are in 5-, and 6-fold coordination with oxygen, the heat-treatment appear to have substantial effect on the alumina structural unit, which can transform [AlO5l into [AlO6]. The FT-IR results show that the structural consist of [PO4], [AlO5] and [AlO6], and they consists the whole net structure through P-O-P and P-O-Al. The vibration at 1483cm^-1 maybe derived from the formation of P-O-Sm bond.

关 键 词：稀土 磷酸盐玻璃 MASNMR FT-IR 

分 类 号：TQ171.73[化学工程—玻璃工业]