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Transparent Ce3+:(Gd,Lu)3Al5O12 with microstructure control were fabricated by two-step spark plasma sintering. In the two-step profile, the heating rate was changed from 50 to 5°C/min at the first-step temperatures. During the initial stage of shrinkage, the holding time of the first step sintering could induce densification by suppressing the microstructure coarsening. As compared to the single-step profile, the two-step profile showed smaller grain size, which decreased with a decrease in the first-step temperature. The porosity of the two-step profile was lower than that of the single-step profile, and the lowest porosity was obtained at the first-step temperature of 1000°C, which was the starting point of shrinkage. The TS-1000 specimen showed the highest transmittance among all the specimens because of the microstructure control
offered by the two-step profile. Thus, by employing the two-step profile, the transmittance could be increased from 50.1% (SS-1250) to 56.5% (TS-1000).

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

Keyword: Two step plasma sintering, Optical property, Photoluminescence characteristics, Microstructure, Gadolinium and lutetium aluminum garnet

Date published: 2022-10-04

Publisher: Elsevier BV

Journal:

• CERAMICS INTERNATIONAL (ISSN: 02728842) vol. 49 issue. 3 p. 4839-4845

Funding:

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4343

First published URL: https://doi.org/10.1016/j.ceramint.2022.09.374

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Updated at: 2024-10-04 08:30:41 +0900

Published on MDR: 2024-10-04 08:30:41 +0900