Microstructure and Properties of Gd2O2S∶Tb Scintillation Ceramics Fabricated by Pressure-Assisted Sintering

doi:10.16553/j.cnki.issn1000-985x.2025.0134

Abstract

Abstract: Gd₂O₂S∶Tb scintillation ceramics have the advantages of high X-ray stopping power， high light output and excellent spectral matching performance and low production cost， making them promising scintillators for security X-ray computed tomography. The Gd₂O₂S∶Tb nano-powders were synthesized from Gd₂O₃ powders， Tb（NO₃）₃ and H₂SO₄ by the hot water-bath reduction method in this work. The pure-phase Gd₂O₂S∶Tb ceramics were fabricated by hot pressing and hot isostatic pressing （HIP） post-treatment. The effects of hot-pressing temperature （975~1 100 ℃） and HIP post-treatment temperature （1 050~1 350 ℃） on the microstructure， optical transmittance and scintillation properties of Gd₂O₂S∶Tb ceramics were systematically investigated. As the hot-pressing temperature increase from 975 ℃ to 1 100 ℃， the pores within the ceramics decrease and the relative densities increase from 91.4% to 98.9%. As the HIP temperature increase from 1 050 ℃ to 1 350 ℃， the relative density of Gd₂O₂S∶Tb ceramics gradually increase， with higher HIP temperatures promoting the removal of internal pores. Therefore， compared to HIP treatments at 1 050 and 1 200 ℃， the Gd₂O₂S∶Tb ceramics treated at 1 350 ℃ exhibit higher total optical transmittance. The Gd₂O₂S∶Tb ceramics hot pressed at 1 050 ℃ for 1.5 h under 60 MPa and HIP post-treated at 1 350 ℃ for 3 h under 176 MPa Ar atmosphere show the highest total optical transmittance of 20.3% at 545 nm （1 mm in thickness）. It also shows the highest X-ray excited luminescence intensity due to the efficient extraction of scintillation light.

Key words: Gd₂O₂S∶Tb scintillation ceramics; hot water-bath method; hot pressing sintering; hot isostatic pressing sintering; microstructure

CLC Number:

TQ174

WU Junlin, HUANG Dong, HU Chen, LI Tingsong, YANG Wenqin, JIANG Xingfen, ZHOU Jianrong, SUN Zhijia, LI Jiang. Microstructure and Properties of Gd₂O₂S∶Tb Scintillation Ceramics Fabricated by Pressure-Assisted Sintering[J]. Journal of Synthetic Crystals, 2025, 54(12): 2119-2126.

Figures/Tables 9

Fig.1 FESEM image of Gd2O2S∶Tb powders

Fig.2 EDS results of Gd2O2S∶Tb ceramics hot pressed at 1 050 ℃ for 1.5 h under 60 MPa

Fig.3 FESEM images of fracture surfaces of Gd2O2S∶Tb ceramics hot pressed at different temperatures for 1.5 h under 60 MPa

Fig.4 Relative density curves of Gd2O2S∶Tb ceramics hot pressed at 975~1 100 ℃ for 1.5 h under 60 MPa and HIP post-treated at 1 050~1 350 ℃ for 3 h under 176 MPa Ar atmosphere

Fig.5 FESEM images of fracture surfaces of Gd2O2S∶Tb ceramics hot pressed at different temperatures for 1.5 h under 60 MPa and HIP post-treated at 1 050 ℃ for 3 h under 176 MPa Ar atmosphere

Fig.6 FESEM images of fracture surfaces of Gd2O2S∶Tb ceramics hot pressed at different temperatures for 1.5 h under 60 MPa and HIP post-treated at 1 350 ℃ for 3 h under 176 MPa Ar atmosphere

Fig.7 Total optical transmission curves of Gd2O2S∶Tb ceramics hot pressed at 975~1 100 ℃ for 1.5 h under 60 MPa and HIP post-treated at 1 350 ℃ for 3 h under 176 MPa Ar atmosphere

Fig.8 Total optical transmission curves of Gd2O2S∶Tb ceramics hot pressed at 1 050 ℃ for 1.5 h under 60 MPa and HIP post-treated at 1 050~1 350 ℃ for 3 h under 176 MPa Ar atmosphere

Fig.9 XEL spectra （a） and normalized integral XEL intensity curves in the range of 350~700 nm （b） of Gd2O2S∶Tb ceramics hot pressed at 975~1 100 ℃ for 1.5 h under 60 MPa and HIP post-treated at 1 350 ℃ for 3 h under 176 MPa Ar atmosphere

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Microstructure and Properties of Gd₂O₂S∶Tb Scintillation Ceramics Fabricated by Pressure-Assisted Sintering

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