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Phase Formation Kinetics in Sol-Gel Derived Strontium Bismith Tantalate

Published online by Cambridge University Press:  21 March 2011

Yun-Mo Sung  and
Woo-Chul Kwack
Yun-Mo Sung
Affiliation:
Department of Materials Science & Engineering, Daejin University Pochun-koon, Kyunggi-do 487-711 Korea (South)
Woo-Chul Kwack
Affiliation:
Department of Materials Science & Engineering, Daejin University Pochun-koon, Kyunggi-do 487-711 Korea (South)
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Abstract

Phase formation characteristics of Sr0.7Bi2.4Ta2O9 (SBT) powder, synthesized via sol-gel and pyrolysis process, was investigated by using thermal analysis. Each of the two exotherms, appearing in differential thermal analysis (DTA) scan curves, was identified as crystallization of fluorite phase and transformation of fluorite to aurivillius phase, respectively by using x-ray diffraction (XRD). By applying non-isothermal kinetic analyses to the DTA results, activation energy values for the formation of fluorite and aurivillius phases were determined as 192 and 375 kJ/mol, respectively and Avrami exponent values for each reaction were determined as 0.91 and 0.96, respectively. These activation energy and Avrami exponent values were discussed in detail to understand phase formation mechanism in SBT system.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 666: Symposium F – Transport and Microstructural Phenomena , 2001 , F7.4
Copyright
Copyright © Materials Research Society 2001

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References

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