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Synthesis of hollandite-type KxGaxSn8−xO16 fine particles by the sol-gel method

Published online by Cambridge University Press:  31 January 2011

Kenjiro Fujimoto ,
Mamoru Watanabe ,
Toshiyuki Mori  and
Shigeru Ito
Kenjiro Fujimoto
Affiliation:
Department of Industrial Chemistry, Faculty of Science and Technology, Science University of Tokyo, Yamazaki 2641, Noda, Chiba 278, Japan
Mamoru Watanabe
Affiliation:
National Institute for Research in Inorganic Materials, Namiki 1-1, Tsukuba, Ibaraki 305, Japan
Toshiyuki Mori
Affiliation:
National Institute for Research in Inorganic Materials, Namiki 1-1, Tsukuba, Ibaraki 305, Japan
Shigeru Ito
Affiliation:
Department of Industrial Chemistry, Faculty of Science and Technology, Science University of Tokyo, Yamazaki 2641, Noda, Chiba 278, Japan
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Abstract

KxGaxSn8−xO16 (x ≤ 2) powders with hollandite structure were prepared by the sol-gel method using metal alkoxides. Dried gels, when being annealed at 973 K, changed to well-crystallized hollandite powders with about 22 m2/g in BET value which consisted of needle-like crystallites 25 nm wide and 65 nm long in average. The specific surface area was nearly 100 times larger than that of the hollandite produced at 1648 K by the conventional method, and the preparation temperature was lowered by 500 to 700 K. The powders obtained at 973 K were characterized as an attractive porous material showing a pore size distribution profile sharply monodispersed at 10.7 nm in the mesopore range.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 4 , April 1998 , pp. 926 - 929
Copyright
Copyright © Materials Research Society 1998

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References

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