Microstructure of rapidly quenched YAG-based glass-ceramics prepared by aerodynamic levitation

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• 作者：Chi-Hoon Lee^a ; Sang-Kyo Jung^a ; Shinichi Yoda^b ; Won-Seung Cho^a ; ^{wscho@inha.ac.kr" class="auth_mail" title="E-mail the corresponding author}
• 关键词：YAG ; Rare earth oxide ; Aerodynamic levitation ; Microstructure ; Photoluminescence
• 刊名：Ceramics International
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：41
• 期：10
• 页码：14475-14481
• 全文大小：1461 K

文摘

Almost-spherical yttrium aluminum garnet (Y₃Al₅O₁₂, YAG) was synthesized using an aerodynamic levitator. The formation of crystalline or glass–ceramic depended on the initial mass of the molten droplet. The YAG was devitrified due to partial crystallization, even after rapid quenching, indicating a high tendency for crystallization. The darker spheroid phase nucleated from the Y₂O₃–Al₂O₃ melt because of a polyamorphic liquid–liquid phase transition. The optical transparency of YAG increased with increasing Eu³⁺ content because of the reduced number of micro-sized crystals, which act as a scattering center to visible light. The photoluminescence intensity of the YAG:Eu glass–ceramic was attributed mainly to an electric dipole ⁵D₀→⁷F₂ transition because the Eu³⁺ in the YAG glass–ceramic is located at sites with low symmetry.