Nanopowder synthesis enabling 1350 ºC full densification of (Gd,La)2O2S:Pr3+ luminescent ceramics via pressureless sintering and the effect of La3+ doping

Zhenqi Song; Fan Li; Sihan Feng; Zhiyuan Pan; Xuejiao Wang; Qi Zhu; Ji-Guang Li

doi:10.1016/j.jeurceramsoc.2024.04.079

論文 Nanopowder synthesis enabling 1350 ºC full densification of (Gd,La)2O2S:Pr3+ luminescent ceramics via pressureless sintering and the effect of La3+ doping

Zhenqi Song (Northeastern University) ; Fan Li (Northeastern University) ; Sihan Feng (Northeastern University) ; Zhiyuan Pan (Northeastern University) ; Xuejiao Wang (Bohai University) ; Qi Zhu (Northeastern University) ; Ji-Guang Li (Research Center for Electronic and Optical Materials/Optical Materials Field/Polycrystalline Optical Material Group, National Institute for Materials Science)

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Zhenqi Song, Fan Li, Sihan Feng, Zhiyuan Pan, Xuejiao Wang, Qi Zhu, Ji-Guang Li. Nanopowder synthesis enabling 1350 ºC full densification of (Gd,La)2O2S:Pr3+ luminescent ceramics via pressureless sintering and the effect of La3+ doping. Journal of the European Ceramic Society. 2024, 44 (12), 7350-7356. https://doi.org/10.1016/j.jeurceramsoc.2024.04.079

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(abstract)

Pr3+ activated Gd2O2S (Gd2O2S:Pr3+) ceramics are important scintillators for X-ray computed tomography, whose fabrication generally requires harsh sintering conditions, such as 1650-1750 °C for pressureless sintering and ~1300-1500 °C and tens to hundreds MPa for pressure assisted sintering. We synthesized in this work a series of [(Gd1-xLax)0.99Pr0.01]2O2S (GLOS:Pr3+) nanopowders of fine crystallite size, high specific surface area and unimodal size distribution through two-step calcination of coprecipitated amorphous precursors. Dilatometry analysis confirmed that the nanopowders possess excellent sinterability, and fully dense GLOS:Pr3+ ceramics were successfully fabricated via pressureless sintering in an Ar/H2 gas mixture at a temperature as low as 1350 °C. La3+ doping was found to substantially enhance densification/grain growth and the 3P0-3H4 main emission (~510 nm) of Pr3+, and tends to elongate the fluorescence lifetime of the Pr3+ emission (~1.89-2.66 μs).

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