Enhanced Aurivillius phase formation kinetics in seeded SBT thin films

Se Yeon Jung, Seung Joon Hwang, Yun Mo Sung

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Strontium bismuth tantalate thin films having composition of Sr0.7Bi2.4Ta2O9 (SBT) were deposited on the pre-crystallized SBT seed layer with the same composition using sol-gel and spin coating methods. Unseeded and seeded SBT thin films were crystallized to fluorite by heating at 600°C for 1h and they were further heated in the range of 710-740°C at 10°C intervals for different time periods to analyze fluorite-to-Aurivillius phase transformation characteristics. X-ray diffraction (XRD) results on the heated films indicate that the phase transformation kinetics is greatly enhanced in the seeded ones. Quantitative X-ray diffraction (Q-XRD) was performed and the results were used for Johnson-Mehl-Avrami (JMA) isothermal kinetic analyses. From JMA plots Avrami exponent values for unseeded and seeded films were determined as ∼1.5 and ∼1.1, respectively, which implies that each film has a different nucleation mechanism. Using Arrhenius plots the activation energy values for the phase transformation of unseeded and seeded films were determined as ∼263 and ∼183 kJ/mol, respectively. The nucleation mechanism difference and the resultant activation energy difference provide the origin of enhanced kinetics in seeded SBT thin films.

Original languageEnglish
Pages (from-to)92-99
Number of pages8
JournalJournal of Crystal Growth
Volume254
Issue number1-2
DOIs
Publication statusPublished - 2003 Jun 1
Externally publishedYes

Fingerprint

phase transformations
Thin films
Kinetics
Fluorspar
Phase transitions
kinetics
fluorite
thin films
Nucleation
Activation energy
plots
nucleation
activation energy
X ray diffraction
Arrhenius plots
Bismuth
Strontium
Spin coating
Chemical analysis
diffraction

Keywords

  • A1. Phase transformation
  • A3. Sol-gel
  • B2. Ferroelectric materials

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Enhanced Aurivillius phase formation kinetics in seeded SBT thin films. / Jung, Se Yeon; Hwang, Seung Joon; Sung, Yun Mo.

In: Journal of Crystal Growth, Vol. 254, No. 1-2, 01.06.2003, p. 92-99.

Research output: Contribution to journalArticle

Jung, Se Yeon ; Hwang, Seung Joon ; Sung, Yun Mo. / Enhanced Aurivillius phase formation kinetics in seeded SBT thin films. In: Journal of Crystal Growth. 2003 ; Vol. 254, No. 1-2. pp. 92-99.
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