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Crystallization Kinetics of Seeded SBT ( Sr0.7Bi2.4Ta2O9 ) Powders from Sol-Gel Derived Precursors

Published online by Cambridge University Press:  17 March 2011

Gopinathan M. A. Kumar ,
Woo-Chul Kwak ,
Se-Yon Jung ,
Seung-Joon Hwang  and
Yun-Mo Sung
Gopinathan M. A. Kumar
Affiliation:
Department of Materials Science & Engineering, Daejin University Pochun-koon, Kyunggi-do 487-711, Korea (South)
Woo-Chul Kwak
Affiliation:
Department of Materials Science & Engineering, Daejin University Pochun-koon, Kyunggi-do 487-711, Korea (South)
Se-Yon Jung
Affiliation:
Department of Materials Science & Engineering, Daejin University Pochun-koon, Kyunggi-do 487-711, Korea (South)
Seung-Joon Hwang
Affiliation:
Department of Materials Science & Engineering, Daejin University Pochun-koon, Kyunggi-do 487-711, Korea (South)
Yun-Mo Sung
Affiliation:
Department of Materials Science & Engineering, Daejin University Pochun-koon, Kyunggi-do 487-711, Korea (South)
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Abstract

Strontium bismuth tantalate (SBT) having composition of Sr0.7Bi2.4Ta2O9 has been prepared through sol-gel method using their corresponding metal alkoxides as precursors. Seeded SBT powder was prepared by the addition of 5 wt.% of nanometer sized SBT particles to the sol followed by pyrolysis. By applying non-isothermal kinetic analysis to the DTA results, activation energy values for the unseeded and seeded samples were determined. Enhanced crystallization kinetics was observed for the seeded one and the activation energy for the aurivillius phase formation was found to be 318 kJ/mol, while 375 kJ/mol for the unseeded. The Avrami exponent values for the seeded and unseeded were found to be 2.80 and 0.96 respectively.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 688: Symposium C – Ferroelectric Thin Films X , 2001 , C4.8.1
Copyright
Copyright © Materials Research Society 2002

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