Co-precipitation synthesis and sintering of yttrium aluminum garnet (YAG) powders: The effect of precipitant

Ji Guang Li, Takayasu Ikegami, Jong Heun Lee, Toshiyuki Mori, Yoshiyuki Yajima

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YAG precursors were co-precipitated from a mixed solution of aluminum and yttrium nitrates using ammonia water and ammonium hydrogen carbonate as precipitants, respectively. Phase evolution of the precursors during calcination and sinterability of the resultant YAG powders were compared between the two methods. The use of ammonia water produced a hydroxide precursor with an approximate composition of Al(OH)3·0.3[Y2(OH)5(NO3)·3H2O] which transformed to pure YAG at about 1000°C via YAlO3 phase. Severe agglomeration caused poor sinterability of the resultant YAG powders. The use of ammonium hydrogen carbonate produced a carbonate precursor with an approximate composition of NH4AlY0.6(CO3)1.9(OH)2·0.8H2O. The precursor directly converted to pure YAG at about 900°C. The precursor was loosely agglomerated and the resultant YAG powders showed good dispersity and excellent sinterability. For the same calcination temperature of 1100°C, YAG powders from the hydroxide precursor and the carbonate precursor densified to ~81.2 and ~99.8% of the theoretical, respectively, by vacuum sintering at 1500°C for 2 h. (C) 2000 Elsevier Science Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)2395-2405
Number of pages11
JournalJournal of the European Ceramic Society
Issue number14-15
Publication statusPublished - 2000 Dec 1
Externally publishedYes



  • Phase evolution
  • Powders-chemical preparation
  • Sintering
  • YAlO
  • YAG

ASJC Scopus subject areas

  • Ceramics and Composites

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