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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.115  No.1348 (December) (2007)  >  pp.925-928

Journal of the Ceramic Society of Japan
<<Previous article Vol.115  No.1348 (December) (2007)   pp.925 - 928 Next article>>

Sol-gel Synthesis of Macroporous YAG from Ionic Precursors via Phase Separation Route

Yasuaki TOKUDOME1), Koji FUJITA2)3), Kazuki NAKANISHI1), Kazuyoshi KANAMORI1), Kiyotaka MIURA2), Kazuyuki HIRAO2) and Teiichi HANADA1)
1) Department of Chemistry, Graduate School of Science, Kyoto University
2) Department of Material Chemistry, Graduate School of Engineering, Kyoto University
3) PRESTO, Japan Science and Technology Agency (JST)


  Yttrium aluminum garnet, Y3Al5O12, (YAG) monoliths with well-defined macropores have been prepared from ionic precursors using the sol-gel method accompanied by phase separation. The addition of propylene oxide to the starting solution controls the gelation, while the addition of poly(ethylene oxide) induces the phase separation. Polymerization-induced phase separation and gelation concur by an appropriate selection of the starting composition, which allows the production of bicontinuous macroporous nanocomposite gels in large dimensions (~10×10×10 mm3). During heat treatment at 800°C, the monolithic nanocomposite gels crystallize into YAG without the formation of any intermediate phases or the precipitation of impurity phases, indicating higher homogeneity of cation distribution in the dried gels. The macroporous YAG network was maintained even after heat treatment at 1000°C for 10 h.



Keyword:
Sol-gel method, Phase separation, Propylene oxide, Mixed metal oxide, Porous material

Received: September 23, 2007
Accepted: November 15, 2007 , Published online: December 01, 2007
Copyright (c) 2007 The Ceramic Society of Japan

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