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Crystallization kinetics and phase transformation characteristics in seeded monophasic cordierite gel

Published online by Cambridge University Press:  31 January 2011

Byung C. Lim  and
Hyun M. Jang
Byung C. Lim
Affiliation:
Department of Materials Science and Engineering, and Advanced Ceramic Processing Science Laboratory, Pohang Institute of Science and Technology (POSTECH), Pohang 790–600, Republic of Korea
Hyun M. Jang*
Affiliation:
Department of Materials Science and Engineering, and Advanced Ceramic Processing Science Laboratory, Pohang Institute of Science and Technology (POSTECH), Pohang 790–600, Republic of Korea
*
a)Address correspondence to this author.
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Abstract

Crystallization kinetics and phase transformation characteristics of μ- or α-cordierite seeded gels were compared with those of unseeded monophasic gels. The α-cordierite seeding modified the sequence of phase transformation and lowered the temperature of α-cordierite formation from amorphous gel by ∽150 °C. The μ-seeded transformation was characterized by 3-dimensional isotropic growth with essentially zero activation energy for the nucleation step. Combining the nucleation theory with the transition state theory, we have separately estimated the activation free energy of nucleation and that of growth step in the crystallization of amorphous cordierite gel. The estimated activation free energies showed that the crystallization of unseeded cordierite gel is mainly growth controlled.

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Articles
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Journal of Materials Research , Volume 6 , Issue 11 , November 1991 , pp. 2427 - 2433
Copyright
Copyright © Materials Research Society 1991

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