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Reactive yttrium aluminate garnet powder via coprecipitation using ammonium hydrogen carbonate as the precipitant

Published online by Cambridge University Press:  31 January 2011

Ji Guang Li ,
Takayasu Ikegami ,
Jong-Heun Lee ,
Toshiyuki Mori  and
Yoshiyuki Yajima
Ji Guang Li
Affiliation:
National Institute for Research in Inorganic Materials, Namiki 1–1, Tsukuba, Ibaraki 305–0044, Japan
Takayasu Ikegami
Affiliation:
National Institute for Research in Inorganic Materials, Namiki 1–1, Tsukuba, Ibaraki 305–0044, Japan
Jong-Heun Lee
Affiliation:
National Institute for Research in Inorganic Materials, Namiki 1–1, Tsukuba, Ibaraki 305–0044, Japan
Toshiyuki Mori
Affiliation:
National Institute for Research in Inorganic Materials, Namiki 1–1, Tsukuba, Ibaraki 305–0044, Japan
Yoshiyuki Yajima
Affiliation:
National Institute for Research in Inorganic Materials, Namiki 1–1, Tsukuba, Ibaraki 305–0044, Japan
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Abstract

Ammonium hydrogen carbonate was used as the precipitant to synthesize yttrium aluminate garnet (YAG) precursors from a mixed solution of aluminum and yttrium nitrates via coprecipitation. The carbonate precursor, with an approximate composition of NH4AlY0.6(CO3)1.9(OH)2 · 0.8H2O, transformed to pure YAG at 900 °C without the formation of intermediate phases. Reactive YAG powder was produced by calcining the precursor at 1100 °C. The YAG powder densified to 99.8% of the theoretical density by vacuum sintering at 1500 °C for 2 h, and the sintered body showed transparency. Less agglomeration of the precursor and good dispersity of the resultant YAG powder were responsible for the excellent sinterability.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 15 , Issue 9 , September 2000 , pp. 1864 - 1867
Copyright
Copyright © Materials Research Society 2000

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