Influence of ionic mobility on the phase transformation route in Y3Al5O12 (YAG) stoichiometry

Meng Jung Li, Yu Chun Wu, Fu Su Yen, Chi Yuan Huang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

17 Citations (Scopus)


Ionic mobilities of Y3+ and Al3+ are controlled using either amorphous or well-crystallized precursors and enhanced by the addition of molten NaCl flux. Experimental results indicate that phase transformation prefers a relatively slow reaction route via YAM-YAP-YAG because of limited ionic mobility when either Y3+ or Al3+ is confined to a crystallized structure. The selection of intermediate phases can be either Y-rich (YAM) or Al-rich (YAP), depending on the competition of ionic mobility between Y3+ and Al3+ during phase transformation. The YAH-YAG route is selected only when the ionic mobility of Y3+ or Al3+ is high enough to induce a nucleation and growth reaction while a certain degree of stoichiometric inhomogeneity is presented; otherwise YAG is crystallized directly from amorphous precursors without passing through any intermediate phase.

Original languageEnglish
Pages (from-to)2099-2106
Number of pages8
JournalJournal of the European Ceramic Society
Issue number12
Publication statusPublished - 15 Oct 2011
Externally publishedYes


  • AlO
  • Diffusion: Microstructural-final
  • Hexagonal-YAP
  • YO

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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