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Low‐Temperature Fabrication of Transparent Yttrium Aluminum Garnet (YAG) Ceramics without Additives
Author(s) -
Li JiGuang,
Ikegami Takayasu,
Lee JongHeun,
Mori Toshiyuki
Publication year - 2000
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2000.tb01305.x
Subject(s) - yttrium , materials science , calcination , coprecipitation , thermogravimetry , sintering , scanning electron microscope , aluminium nitrate , differential thermal analysis , mineralogy , aluminium , ceramic , transparent ceramics , chemical engineering , inorganic chemistry , metallurgy , oxide , composite material , chemistry , catalysis , biochemistry , physics , diffraction , optics , engineering
A carbonate precursor of yttrium aluminum garnet (YAG) with an approximate composition of NH 4 AlY 0.6 (CO 3 ) 1.9 (OH) 2 ·0.9H 2 O 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 ∼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.