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Hydrothermal growth of millimeter-sized aluminosilicate sodalite single crystals in noble metal capsules

Published online by Cambridge University Press:  31 January 2011

Tomohiro Hayashi ,
Hidemoto Shiga ,
Masayoshi Sadakata ,
Tatsuya Okubo  and
Masahiro Yoshimura
Tomohiro Hayashi
Affiliation:
Department of Chemical System Engineering, The University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo 113–8656, Japan
Hidemoto Shiga
Affiliation:
Department of Chemical System Engineering, The University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo 113–8656, Japan
Masayoshi Sadakata
Affiliation:
Department of Chemical System Engineering, The University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo 113–8656, Japan
Tatsuya Okubo
Affiliation:
Department of Chemical System Engineering, The University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo 113–8656, Japan
Masahiro Yoshimura
Affiliation:
Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226–8503, Japan
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Abstract

Aluminosilicate sodalite Na8[SiAlO4]6Cl2 single crystals are synthesized by hydrothermal processing at 873–973 K and 100–150 MPa in noble metal capsules to avoid contamination. The starting material is aluminosilicate gel, and spontaneous nucleation followed by its growth takes place. The largest size of the single crystals obtained is 1 mm across. Longer aging and heating result in larger single crystals. It is also found that the aluminum source in the synthesis gel and the element used in the noble metal capsules influence the single crystal growth. Judging from x-ray diffraction (XRD) (powder and single-crystal), optical microscopy, and thermogravimetry and differential thermal analysis (TG-DTA), the sodalite single crystals grown have good quality compared with the conventional powder.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 4 , April 1998 , pp. 891 - 895
Copyright
Copyright © Materials Research Society 1998

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References

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