Journal of Inorganic Materials ›› 2023, Vol. 38 ›› Issue (4): 452-460.DOI: 10.15541/jim20220542

• RESEARCH LETTER • Previous Articles     Next Articles

Fabrication and Microstructure of Gd2O2S:Tb Scintillation Ceramics from Water-bath Synthesized Nano-powders: Influence of H2SO4/Gd2O3 Molar Ratio

WU Junlin1,2(), DING Jiyang1,3, HUANG Xinyou3, ZHU Danyang1,2, HUANG Dong1,3, DAI Zhengfa1, YANG Wenqin4,5, JIANG Xingfen4,5, ZHOU Jianrong4,5, SUN Zhijia4,5, LI Jiang1,2()   

  1. 1. Key Laboratory of Transparent Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China
    2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
    3. School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, China
    4. Spallation Neutron Source Science Center, Dongguan 523803, China
    5. State Key Laboratory of Particle Detection and Electronics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • Received:2022-09-16 Revised:2022-10-13 Published:2023-04-20 Online:2022-12-30
  • Contact: LI Jiang, professor. E-mail:
  • About author:WU Junlin (1998-), male, Master candidate. E-mail:
  • Supported by:
    National Natural Science Foundation of China(12175254);National Natural Science Foundation of China(U1832119);National Key R&D Program of China(2021YFE0104800);International Partnership Program of Chinese Academy of Sciences(121631KYSB20200039);International Cooperation Project of Shanghai Science and Technology Commission(20520750200);National Centre for Research and Development(WPC2/1/SCAPOL/2021)


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.

Key words: water-bath method, molar ratio of H2SO4 to Gd2O3, Gd2O2S:Tb nanopowder, scintillation ceramics

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