TY - JOUR
T1 - Low-temperature fabrication of transparent yttrium aluminum garnet (YAG) ceramics without additives
AU - Li, Ji Guang
AU - Ikegami, Takayasu
AU - Lee, Jong Heun
AU - Mori, Toshiyuki
PY - 2000
Y1 - 2000
N2 - 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.
AB - 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.
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U2 - 10.1111/j.1151-2916.2000.tb01305.x
DO - 10.1111/j.1151-2916.2000.tb01305.x
M3 - Article
AN - SCOPUS:0033905260
SN - 0002-7820
VL - 83
SP - 961
EP - 963
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 4
ER -