不同浓度Y^(3+)离子掺杂对CaF_(2)晶体性能的影响  

Effect of Doping with Different Concentrations of Y^(3+)Ions on the Properties of CaF_(2)Crystals

作　　者：王旭[1,2] 李翔 寇华敏[2] 方伟[2,3] 吴庆辉 苏良碧[2] WANG Xu;LI Xiang;KOU Huamin;FANG Wei;WU Qinghui;SU Liangbi(School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 201899,China;Department of Materials Science and Engineering,Wuhan Institute of Technology,Wuhan 430205,China)

机构地区：[1]上海理工大学材料与化学学院,上海200093 [2]中国科学院上海硅酸盐研究所,上海201899 [3]武汉工程大学材料科学与工程学院,武汉430205

出　　处：《无机材料学报》2024年第9期1029-1034,共6页Journal of Inorganic Materials

基　　金：国家重点研发计划(2021YFE0104800);国家自然科学基金(U2230103024,52072245);上海市科委项目(23511102700,23YF1413400);中国科学院稳定支持基础研究领域青年团队计划(YSBR-024)。

摘　　要：氟化钙(CaF_(2))晶体具有良好的光学性能和化学稳定性,常常在极端边缘的光学窗口场景中用作基底材料。值得关注的是,CaF_(2)晶体的抗辐照损伤性能作为紫外激光器窗口材料的关键性能之一,由于解理效应导致的损伤增长过快,实际损伤阈值远低于理论值,无法满足紫外大功率激光器件的需求,是限制其在高功率紫外激光器中应用的主要因素。本研究运用材料组分设计,通过掺杂惰性稀土Y^(3+)引入F_(i)^(-),利用Y^(3+)与F_(i)^(-)之间的团簇作用增加解理面之间的键合数,以达到增强层间结合力,降低解理效应,提高损伤阈值的目的。采用坩埚下降法的晶体生长工艺,使用多孔坩埚在同一条件下制备了不同Y^(3+)掺杂浓度的CaF_(2)晶体,并对掺杂的CaF_(2)晶体的光学质量、机械性能以及热学性能进行分析表征。实验结果表明,适量Y^(3+)掺杂对CaF_(2)晶体的光学性能和热学性能,如透过率、热膨胀系数和热导率等改变较小,不影响CaF_(2)晶体的使用;而对机械性能,如剪切强度影响相对突出,当掺杂浓度为原子分数0.36%时,其剪切强度提高了68.4%,对应Y:CaF_(2)晶体的激光损伤阈值提高了166%。Calcium fluoride(CaF_(2))crystals have good optical properties and chemical stability,and are often used as substrate materials in extreme edge optical window scenes.It is noteworthy that as one of the key properties of UV laser window materials,the radiation damage resistance of CaF_(2)crystal increases too fast due to the cleavage effect,and the actual damage threshold is much lower than the theoretical value,which cannot meet the needs of UV high-power laser devices,and is the main factor limiting its application in high-power UV lasers.In this study,material-composition design was used to introduce Fi by doping inert rare earth Y^(3+),and the cluster effect between Y^(3+)and F_(i)^(-)was used to increase the bonding number between the cleavage planes,so as to enhance the interlayer bonding force,reduce the cleavage effect and raise the damage threshold.CaF_(2)crystals doped with Y^(3+)were prepared under the same condition by using a porous crucible,and their optical quality,mechanical properties and thermal properties of the doped CaF_(2)crystals were characterized and analyzed.The experimental results show that appropriate amount of Y^(3+)doping has little effect on the optical and thermal properties of CaF_(2)crystals,such as transmittance,thermal expansion coefficient and thermal conductivity,and does not affect the performance of CaF_(2)crystals.However,the influence on mechanical properties,such as shear strength,is relatively prominent.When the optimized doping concentration is 0.36%(in atom),the shear strength is increased by 68.4%,and the corresponding laser induced damage threshold of Y:CaF_(2)crystal is increased by 166%.

关 键 词：CaF_(2)晶体 团簇结构 剪切应力 损伤特性 

分 类 号：TQ174[化学工程—陶瓷工业]