Crystallization kinetics of seeded SBT (Sr0.7Bi2.4Ta2O9) powders from sol-gel derived precursors

Gopinathan M.A. Kumar, Woo Chul Kwak, Se Yon Jung, Seung Joon Hwang, Yun Mo Sung

Research output: Contribution to journalConference article

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.

Original languageEnglish
Pages (from-to)89-94
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume688
Publication statusPublished - 2002
EventFerroelectric Thin Films X - Boston, MA, United States
Duration: 2001 Nov 252001 Nov 29

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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