无机材料学报2023，Vol.38Issue(4)：452-460,9.DOI:10.15541/jim20220542
Gd2O2S:Tb闪烁陶瓷的制备与结构:水浴合成中H2SO4/Gd2O3摩尔比的影响
Fabrication and Microstructure of Gd2O2S:Tb Scintillation Ceramics from Water-bath Synthesized Nano-powders:Influence of H2SO4/Gd2O3 Molar Ratio
摘要
Abstract
The Gd2O2S:Tb scintillation ceramics is extensively used for neutron radiography and industrial non-destructive testing due to its bright green emission,high intrinsic conversion efficiency and high thermal neutron capture cross-section.However,the existence of Gd2O3 secondary phase in Gd2O2S ceramics impedes the scintillation property.In this work,The Gd2O2S:Tb precursors were synthesized in water-bath with H2SO4 and Gd2O3 as starting materials.Molar ratio of H2SO4 to Gd2O3 defined as n was adjusted to synthesize the precursors.,which influence on the properties of the precursors and powders was studied.Chemical composition of the precursors changes with the increase of n,from 2Gd2O3·Gd2(SO4)3·xH2O(n<2.00)to Gd2O3·2Gd2(SO4)3·xH2O(2.25≤n≤2.75),and to Gd2(SO4)3·8H2O(n=3.00).After being calcined and reduced,all the powders form pure Gd2O2S phase.Morphology of the Gd2O2S:Tb powders is closely related to the phase composition of the precursor.Increasement of the XEL intensity shows two stages with n increase,corresponding to the phase transition of the precursor,respectively.The Gd2O2S:Tb scintillation ceramics were therefore fabricated by vacuum pre-sintering and HIP post-treatment.The ceramics were fabricated from the powders prepared with different n,achieving high relative density and XEL intensity,except the ceramics fabricated from the powders prepared with the n=2.00,2.25,2.50.The increase of n is beneficial to the removal of the Gd2O3 secondary phase from the Gd2O2S:Tb ceramics.This work provides a way for eliminating the secondary phase in Gd2O2S:Tb scintillation ceramics.关键词
水浴法/H2SO4与Gd2O3摩尔比/Gd2O2S:Tb纳米粉体/闪烁陶瓷Key words
water-bath method/molar ratio of H2SO4 to Gd2O3/Gd2O2S:Tb nanopowder/scintillation ceramics分类
化学化工引用本文复制引用
吴俊林,孙志嘉,李江,丁继扬,黄新友,朱丹阳,黄东,代正发,杨文钦,蒋兴奋,周健荣..Gd2O2S:Tb闪烁陶瓷的制备与结构:水浴合成中H2SO4/Gd2O3摩尔比的影响[J].无机材料学报,2023,38(4):452-460,9.基金项目
National Natural Science Foundation of China(12175254,U1832119) （12175254,U1832119）
National Key R&D Program of China(2021YFE0104800) （2021YFE0104800）
International Partnership Program of Chinese Academy of Sciences(121631KYSB20200039) （121631KYSB20200039）
International Cooperation Project of Shanghai Science and Technology Commission(20520750200) （20520750200）
National Centre for Research and Development(WPC2/1/SCAPOL/2021) （WPC2/1/SCAPOL/2021）
