Composition and properties tailoring in Mg2+ codoped non-stoichiometric LuAG:Ce,Mg scintillation ceramics |
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| Affiliation: | 1. Key Laboratory of Transparent Opto-functional Inorganic Materials, Shanghai Institute of Ceramic, Chinese Academy of Science, 200050 Shanghai, China;2. Institute of Physics v.v.i., AS CR, Cukrovarnicka 10, 16253 Prague, Czechia;3. CERN, PH-LHB Group, Geneva 23, CH1211 Switzerland;4. Shanghai Normal University, 200234 Shanghai, China;1. Department of Materials and Processes, Rafael, Haifa 31021 Israel;2. Department of Materials Science and Engineering, Technion − Israel Institute of Technology, Haifa 32000 Israel, Israel;1. College of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China;2. Department of Nuclear Medicine, Tumor Hospital of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Kunming 650118, China;1. The Key Laboratory of Surface Functional Structure Manufacturing of Guangdong High Education Institutes, South China University of Technology, Guangzhou 510641, China;2. Foshan Nationstar Optoelectronics Company Ltd., Foshan 528000, China;3. The Department of Mechanical Engineering, University of California, Berkeley, USA;1. Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Villeurbanne Cedex, France;2. European Organization for Nuclear Research, CERN, Dept PH-CHX-1211 Geneva, Switzerland |
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| Abstract: | A comprehensive study of the optical, radioluminescence and scintillation properties of both the Lu3+ rich and Lu3+ deficient non-stoichiometric Lu3+xAG:Ce,Mg (Lu3+xAl5O12:Ce,Mg, x = −4, −1, +1 and +4 at.%) ceramics are performed, completed further by the microstructure and defects characterization. Small deviation from the stoichiometric composition as well as Mg2+ codoping plays a crucial role in ceramic transparency, radioluminescence intensity and the timing characteristics of scintillation response. The LuAl antisite defects could be suppressed efficiently by controlling Lu3+ content below stoichiometry of LuAG host. MgO (Mg2+ ions) as effective sintering aids, can improve both the optical quality and scintillation performance (light yield, scintillation decay times and the ratio of fast decay components). We generally discuss the composition dependence of defects and properties tailoring. We also performed the systematic comparative study with the stoichiometric LuAG:Ce,Mg ceramic and the commercial BGO and LuAG:Ce single crystals. |
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| Keywords: | Non-stoichiometric ceramics LuAG:Ce,Mg scintillator Antisite defects Afterglow |
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