高掺量稀土磷酸盐玻璃化学稳定性的研究  

Study on the chemical durability of high doped rare earth phosphate glass

作　　者：孟献丰[1] 陆春华[1] 张其土[1] 倪亚茹[1] 许仲梓[1] 

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京210009

出　　处：《材料科学与工艺》2007年第5期734-737,共4页Materials Science and Technology

基　　金：江苏省"333工程"资助项目(JS2001-78);教育部优秀青年骨干教师基金资助项目(教技司[2000]65)

摘　　要：稀土掺杂的磷酸盐玻璃作为激光介质和特种光学玻璃材料,其化学稳定性研究是至关重要的.本文主要研究了掺加10mol%和15mol%Sm2O3的P2O5-BaO-Al2O3体系玻璃的化学稳定性,研究结果表明:玻璃的耐水性能受玻璃中离子含量的影响较大,Al3+和Sm3+离子的含量越高,结构越稳定,耐水性能越好;玻璃的耐酸性能与结构中阳离子的极化能力(Z2/r)有关,Z2/r越大,耐酸性能越好,而且玻璃的侵蚀是渐缓的,这是由于玻璃表面形成了一层明显的覆盖层所致;玻璃在碱性介质中的侵蚀机理是磷酸盐长链末节的金属离子被水化,产生P-O-P断键,形成正磷酸盐溶解到溶液中,同时,随着稀土离子的增加,耐碱性能变差.As the Laser medium and special type optical glass materials, the chemical durability of phosphate glass doped with rare earth is important, In this paper, the chemistry stability was studied on P2 05 - BaO - A1203 system glass doped with 10mol% and 15m01% Sm203. The results showed that with the increasing of A13 ＋ and Sm3 ＋ content, the structure of glass tended to be more stability, and the water resistance performance was more excellent. Corrosion of the glass in acid media depended on the polarize ability （Z^2/r）, and the acid resistance would be improved when the Z^2/r was increasing, moreover, the dissolution rate decreased be- cause of a hydrated layer. The corrosion mechanism of the glass in alkali media was that after the metal ions of phosphate long chain were hydrated, the P - 0 - P bond was disentangled and dissolved in the form of ortho- phosphate. The results displayed that with the increasing of Sm^3＋ ions, the alkali resistance performance de- creased.

关 键 词：磷酸盐玻璃 稀土 化学稳定性 侵蚀机理 覆盖层 

分 类 号：TQ171.73[化学工程—玻璃工业]