期刊
CERAMICS INTERNATIONAL
卷 49, 期 3, 页码 4839-4845出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.09.374
关键词
Two-step spark plasma sintering; Optical property; Photoluminescence characteristics; Microstructure; Gadolinium and lutetium aluminum garnet
Transparent Ce3+:(Gd,Lu)3Al5O12 material with microstructure control was fabricated using two-step spark plasma sintering. The two-step profile resulted in smaller grain size and lower porosity compared to the single-step profile, leading to increased transmittance.
Transparent Ce3+:(Gd,Lu)3Al5O12 with microstructure control was fabricated by two-step spark plasma sintering. In the two-step profile, the heating rate was changed from 50 to 5 degrees 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 a 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 degrees C, which was the starting point of shrinkage. The TS-1000 specimen showed the highest transmittance among all 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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