La∶PbWO_4晶体中La^(3+)离子的分布及其对晶体辐照硬度的影响  

Distribution of La3+ Ions in La∶PbWO4 Single Crystals and Its Influence on the Radiation Hardness

作　　者：韩宝国[1,2] 冯锡淇[1,2] 胡关钦[1,2] 张雁行[1,2] 雷宁[1,2] 

机构地区：[1]中国科学院无机功能材料开放实验室 [2]中国科学院上海硅酸盐研究所

出　　处：《人工晶体学报》1998年第3期213-218,共6页Journal of Synthetic Crystals

基　　金：国家自然科学重点基金

摘　　要：对Ｌａ掺杂钨酸铅（ＰｂＷＯ４）晶体从其头部（靠近晶种）到尾部逐点测量了透射谱及辐照诱导色心吸收谱，实验结果清楚地证实了Ｌａ掺杂改善ＰｂＷＯ４晶体辐照硬度的作用。根据晶体生长的分凝理论对晶体中Ｌａ的分布浓度进行了计算，得到了晶体３５０ｎｍ处光透过率与Ｌａ分布浓度的关系曲线，它可以作为选择最佳掺Ｌａ浓度的依据。此外，对实验数据的进一步分析揭示了晶体固有色心吸收带与辐照诱导色心吸收带之间的对应关系，为深入探讨ＰｂＷＯ４晶体的辐照损伤机制提供了实验依据。he optical transmission and irradiation induced absorption spectra have been measured step by step from the top to the bottom of La3+∶PbWO4 crystals,experiment results proved that La doping can effectively improve the radiation hardness of PWO crystals.Based on the segregation theory of crystal growth,the La ions distribution concentration has been calculated,and the correlation curve of the transmission at 350 nm and La concentration has been gotten.It may provide some useful information for selecting most appropriate La doping concentration in the growing process.Moreover,the corresponding relation between intrinsic and radiation induced absorption bands observed in the experiments has provided experimental foundation for deeper understanding of the radiation damage mechanism of PbWO4 crystals.

关 键 词：钨酸铅晶体 辐照硬度 镧离子 晶体 掺杂 

分 类 号：O614.433[理学—无机化学]