Crystallization of Y2O3鈥揂l2O3 Rich Glasses: Synthesis of YAG Glass-Ceramics

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• 作者：Salaheddine Alahrach茅 ; Micha毛l Deschamps ; Julien Lambert ; Matthew R. Suchomel ; Domingos De Sousa Meneses ; Guy Matzen ; Dominique Massiot ; Emmanuel V茅ron ; Mathieu Allix
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：October 27, 2011
• 年：2011
• 卷：115
• 期：42
• 页码：20499-20506
• 全文大小：1059K
• 年卷期：v.115,no.42(October 27, 2011)
• ISSN：1932-7455

文摘

An yttria-alumina glass incorporating 4 wt % of SiO₂ was prepared by the use of an aerodynamic levitator equipped with a laser heating device. Upon post synthesis annealing, the glass is observed to exhibit crystallization below the glass transition temperature. In the current study, this unusual behavior is examined using powder X-ray diffraction and infrared spectroscopy to follow crystallinity and optical absorbance as a function of annealing treatment. Double-resonance ²⁷Al/²⁹Si NMR spectroscopy and synchrotron diffraction experiments demonstrate that Si cations are incorporated in the formed Y₃Al₅O₁₂ (YAG) crystals on the 4-fold coordination Al site during crystallization. This has important consequences on the resulting microstructure of the YAG glass-ceramics.