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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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• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: Oxysulfide ceramics, Nanopowder, Low-temperature sintering, Pr3+ luminescence

Date published: 2024-05-02

Publisher: Elsevier

Journal:

• Journal of the European Ceramic Society (ISSN: 09552219) vol. 44 issue. 12 p. 7350-7356

Funding:

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4598

First published URL: https://doi.org/10.1016/j.jeurceramsoc.2024.04.079

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Updated at: 2026-02-14 22:51:47 +0900

Published on MDR: 2026-05-02 08:22:07 +0900