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

Yasuaki TOKUDOME; Koji FUJITA; Kazuki NAKANISHI; Kazuyoshi KANAMORI; Kiyotaka MIURA; Kazuyuki HIRAO; Teiichi HANADA

doi:10.2109/jcersj2.115.925

Feature: Aqueous Solution Science for Ceramic Processing: Papers

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

Yasuaki TOKUDOME, Koji FUJITA, Kazuki NAKANISHI, Kazuyoshi KANAMORI, Kiyotaka MIURA, Kazuyuki HIRAO, Teiichi HANADA

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

JOURNAL FREE ACCESS

2007 Volume 115 Issue 1348 Pages 925-928

DOI https://doi.org/10.2109/jcersj2.115.925

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Abstract

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.

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