The radiation hardness of Pr:LuAG scintillating ceramics
The radiation hardness of Pr:LuAG scintillating ceramics
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DOI：
10.1016/j.ceramint.2013.09.052
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发表时间：
2014-03
影响因子：
5.2
通讯作者：
Yiqiang Shen;Xi-qi Feng;Yun Shi;A. Vedda;F. Moretti;Chen Hu;Shuping Liu;Yu-bai Pan;H. Kou;Lexiang Wu
中科院分区：
文献类型：
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作者：
Yiqiang Shen;Xi-qi Feng;Yun Shi;A. Vedda;F. Moretti;Chen Hu;Shuping Liu;Yu-bai Pan;H. Kou;Lexiang Wu
闪烁陶瓷被认为是用于高能物理中升级的HL-LHC（高亮度大型强子对撞机）系统的材料。然而，缺陷，退火工艺和辐射硬度之间的关系仍然有待探索和理解。本文针对HL LHC中Pr：LuAG陶瓷的应用需求，研究了电离辐射、空气退火和烧结助剂对Pr：LuAG陶瓷的影响。发现Si ~（4+）和Mg ~（2+）促进了氧空位浓度的增加，而没有引起额外的辐射诱导色心，而电离辐射则会带来严重的损伤，阻止光输出。Pr ~（3+）/Pr ~（4+）离子不仅作为发光中心，而且作为本征缺陷的补偿剂，这可能是由于Pr：LuAG和LuAG之间观察到的辐照差异所致。发现退火对辐射诱导吸收具有相反的效果。从这项研究中，证实了从原材料中去除特定杂质是陶瓷优化的一个严格步骤，并且适当使用烧结助剂不仅有助于陶瓷的透明度，而且对辐射硬度的危害较小。
Scintillating ceramics have been considered to be used in upgraded HL-LHC (high luminosity large hadron collider) systems in high energy physics. However, the relationship between defects, annealing process, and radiation hardness still remains to be explored and understood. In this paper, Pr:LuAG ceramics were investigated as the promising scintillators due to the application requirements in HL-LHC, including the effects of ionizing irradiation, air annealing and sintering aids. Si4+and Mg2+were found to promote a concentration increase of oxygen vacancies without causing additional radiation induced color centers, while ionizing irradiation bring severe damage preventing light output. The Pr3+/Pr4+ions act not only as luminescent center, but also as compensator of intrinsic defects which could be attributed to the distinguish irradiation differences observed between Pr:LuAG and LuAG. Annealing was found to have an opposite effect on radiation induced absorption. From this study, it is confirmed that elimination of specific impurities from raw materials is a demanding step in ceramic optimization, and proper use of sintering aids could not only contribute to the ceramic transparency but also bring less harm to radiation hardness.