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Crystallization of hafnia and zirconia during the pyrolysis of acetate gels

Published online by Cambridge University Press:  31 January 2011

Masatomo Yashima
Affiliation:
Department of Materials Science and Engineering, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama-shi, 226–8502, Japan
Taka-aki Kato
Affiliation:
Materials and Structures Laboratory and Center for Materials Design, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama-shi, 226–8503, Japan
Masato Kakihana
Affiliation:
Materials and Structures Laboratory and Center for Materials Design, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama-shi, 226–8503, Japan
Mehmet Ali Gulgun
Affiliation:
Materials and Structures Laboratory and Center for Materials Design, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama-shi, 226–8503, Japan
Yohtaro Matsuo
Affiliation:
Department of Inorganic Materials, Faculty of Engineering, Tokyo Institute of Technology, 2–12–1, O-okayama, Meguro-ku, Tokyo 152–8552, Japan
Masahiro Yoshimura
Affiliation:
Center for Materials Design, Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama-shi, 226–8503, Japan
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Abstract

Hafnia and zirconia gels were prepared by drying hafnyl or zirconyl acetate solutions. Hafnia and zirconia gels contain both hydroxyl group and bidentate acetates which are directly bonded to the metal ions. Thermal decomposition and crystallization behavior of the gels were investigated through XRD, FT-IR, and TEM. Hafnium-containing gels crystallized directly into stable monoclinic hafnia around 500–540 °C, while zirconium-containing gels first formed metastable tetragonal zirconia around 450 °C. The dissimilar crystallization behavior of the gels into metastable, tetragonal zirconia or into stable, monoclinic hafnia can be explained through the difference in free-energy changes of the tetragonal-to-monoclinic phase transformation.

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Articles
Copyright
Copyright © Materials Research Society 1997

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