Enhanced crystal growth kinetics in cation-doped Sr0.7Bi 2.3Ta2O9 ferroelectric thin films

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Sr0.7Bi2.3Ta1.7Ti0.3O 9 (SBTT) and Sr0.7Bi2.3Ta1.7Zr 0.3O9 (SBTZ) ferroelectric thin films were fabricated through partial substitution of Ta5+ ions in Sr0.7Bi 2.3Ta2O9 (SBT) and crystal growth kinetics of ferroelectric Aurivillius phase was analyzed and compared for each thin film. Quantitative X-ray difraction (Q-XRD) analyses were performed on each thin film isothermally heated in the range of 730-760°C at 10°C intervals for different time periods. Activation energy and Avrami exponent values for Aurivillius crystal growth were determined by employing Johnson-Mehl-Avrami (JMA) isothermal kinetic analyses to the Q-XRD data. A reduction of ∼51 and ∼82 kJ/mol in activation energy was observed for the SBTT and SBTZ, respectively, which plays a major role in enhancing the crystal growth kinetics of SBTT and SBTZ thin films. A possible mechanism for the reduction in activation energy values was discussed based upon the ionic bond strength difference. The Avrami exponent values were determined as ∼1.0 for SBT, SBTT, and SBTZ thin films, indicating one-dimensional crystal growth with a diffusion-controlled mechanism at a decreasing nucleation rate.

Original languageEnglish
Pages (from-to)325-329
Number of pages5
JournalCrystal Growth and Design
Volume4
Issue number2
DOIs
Publication statusPublished - 2004 Mar 1
Externally publishedYes

Fingerprint

Ferroelectric thin films
Growth kinetics
Crystallization
Crystal growth
Cations
crystal growth
Positive ions
cations
Thin films
Activation energy
kinetics
thin films
activation energy
X rays
exponents
Ferroelectric materials
Nucleation
Substitution reactions
Ions
x rays

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Enhanced crystal growth kinetics in cation-doped Sr0.7Bi 2.3Ta2O9 ferroelectric thin films. / Sung, Yun Mo.

In: Crystal Growth and Design, Vol. 4, No. 2, 01.03.2004, p. 325-329.

Research output: Contribution to journalArticle

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