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Well-sinterable Y3Al5O12 Powder from Carbonate Precursor

Published online by Cambridge University Press:  31 January 2011

Ji-Guang Li,
Takayasu Ikegami,
Jong-Heun Lee and
Toshiyuki Mori
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
*
a)Address all correspondence to this author. e-mail: jgli@nirim.go.jp
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Abstract

Carbonate precursors of Y3Al5O12 (YAG) were synthesized from a mixed solution of alum and yttrium nitrate using ammonium hydrogen carbonate as precipitant. Precipitation method (normal-strike or reverse-strike) and aging were found to have dramatic effects on cation homogeneity of the precursor, which in turn influenced the formation temperature of the YAG phase. Reactive YAG powders were produced from the reverse-strike-derived, as-synthesized precursors at temperatures ≤1200 °C. These powders densified to >98.0% of the theoretical density up to 1500 %C at a constant heating rate of 8 %C/min or to transparency by vacuum sintering at 1700 %C for 1 h without additives.

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Articles
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Journal of Materials Research , Volume 15 , Issue 7 , July 2000, pp. 1514 - 1523
Copyright
Copyright © Materials Research Society 2000

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