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http://dx.doi.org/10.3740/MRSK.2011.21.11.604

Effect of BaF2 as a Flux in Solid State Synthesis of Y3Al5O12:Ce3+  

Won, Hyung-Seok (Chungnam National University Department of nano materials)
Hayk, Nersisyan (Chungnam National University Department of nano materials)
Won, Chang-Whan (Chungnam National University Department of nano materials)
Won, Hyung-Il (Chungnam National University Department of nano materials)
Publication Information
Korean Journal of Materials Research / v.21, no.11, 2011 , pp. 604-610 More about this Journal
Abstract
The effect of $BaF_2$ flux in $Y_3Al_5O_{12}:Ce^{3+}$(YAG:Ce) formation was investigated. Phase transformation of $Y_3Al_5O_{12}$(YAG) was characterized by using XRD, SEM, and TEM-EDS, and it was revealed that the sequential formation of the $Y_4Al_2O_9$(YAM), $YAlO_3$(YAP) and $Y_3Al_5O_{12}$(YAG) in the temperature range of 1000-1500$^{\circ}C$. Single phase of YAG was revealed from 1300$^{\circ}C$. In order to find out the effect of $BaF_2$ flux, three modeling experiments between starting materials (1.5$Al_2O_3$-2.5$Y_2O_3$, $Y_2O_3$-$BaF_2$, and $Al_2O_3$-$BaF_2$) were done. These modeling experiments showed that the nucleation process occurs via the dissolution-precipitation mechanism, whereas the grain growth process is controlled via the liquid-phase diffusion route. YAG:Ce phosphor particles prepared using a proposed technique exhibit a spherical shape, high crystallinity, and an emission intensity. According to the experimental results conducted in this investigation, 5% of $BaF_2$ was the best concentration for physical, chemical and optical properties of $Y_3Al_5O_{12}:Ce^{3+}$(YAG:Ce) that is approximately 10-15% greater than that of commercial phosphor powder.
Keywords
$Y_3Al_5O_{12}:Ce^{2+}$; barium fluoride; flux; particle shape;
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