Phase formation kinetics in sol-gel derived strontium bismith tantalate

Yun Mo Sung, Woo Chul Kwack

Research output: Contribution to journalConference article

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.

Original languageEnglish
Pages (from-to)F741-F746
JournalMaterials Research Society Symposium - Proceedings
Volume666
DOIs
Publication statusPublished - 2001
Externally publishedYes
EventTransport and Microstructural Phenomena in Oxide Electronics - San Francisco, CA, United States
Duration: 2001 Apr 162001 Apr 20

ASJC Scopus subject areas

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

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