Enhancement of Aurivillius phase formation kinetics in SBT thin films using nanoparticle seeding

Yun Mo Sung, Woo Chul Kwak, Se Yon Jung, Seung Joon Hwang

Research output: Contribution to journalConference article

Abstract

Pt/Ti/SiO2/Si substrates seeded by SBT nanoparticles (∼60-80 nm) were used to enhance the phase formation kinetics of Sr 0.7Bi2.4Ta2O9 (SBT) thin films. The volume fractions of Aurivillius phase formation obtained through quantitative x-ray diffraction (Q-XRD) analyses showed highly enhanced kinetics in seeded SBT thin films, The Avrami exponents were determined as ∼1.4 and ∼0.9 for unseeded and seeded SBT films, respectively, which reveals different nucleation modes. By using Arrhenius-type plots the activation energy values for the phase transformation of unseeded and seeded SBT thin films were determined to be ∼264 and ∼168 kJ/mol, respectively. This gives a key reason to the enhanced kinetics in seeded films. Microstructural analyses on unseeded SBT thin films showed formation of randomly oriented needle-like crystals, while those on seeded ones showed formation of domains comprised of directionally grown worm-like crystals.

Original languageEnglish
Pages (from-to)169-174
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume784
Publication statusPublished - 2003 Dec 1
EventFerroelectric Thin Films XII - Boston, MA, United States
Duration: 2003 Dec 12003 Dec 4

ASJC Scopus subject areas

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

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