Low-temperature fabrication of transparent yttrium aluminum garnet (YAG) ceramics without additives

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

Research output: Contribution to journalArticle

142 Citations (Scopus)

Abstract

A carbonate precursor of yttrium aluminum garnet (YAG) with an approximate composition of NH4AlY0.6(CO3)1.9(OH)2·0.9H2O was synthesized via a coprecipitation method from a mixed solution of ammonium aluminum sulfate and yttrium nitrate, using ammonium hydrogen carbonate as the precipitant. The precursor precipitate was characterized using chemical analysis, differential thermal analysis/thermogravimetry, X-ray diffractometry, and scanning electron microscopy. The sinterability of the YAG powders was evaluated by sintering at a constant rate of heating in air and vacuum sintering. The results showed that the precursor completely transforms to YAG at approximately 1000 °C via the formation of a yttrium aluminate perovskite (YAP) phase. YAG powders obtained by calcining the precursor at temperatures of ≤1200 °C were highly sinterable and could be densified to transparency under vacuum at 1700 °C in 1 h without additives.

Original languageEnglish
Pages (from-to)961-963
Number of pages3
JournalJournal of the American Ceramic Society
Volume83
Issue number4
Publication statusPublished - 2000 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Ceramics and Composites

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