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Enhancement of Aurivillius Phase Formation Kinetics in SBT Thin Films using Nanoparticle Seeding

Published online by Cambridge University Press:  01 February 2011

Yun-Mo Sung ,
Woo-Chul Kwak ,
Se-Yon Jung  and
Seung-Joon Hwang
Yun-Mo Sung
Affiliation:
Department of Materials Science & Engineering, Daejin University, Pochun-si, Kyunggi-do 487–711, Korea (South)
Woo-Chul Kwak
Affiliation:
Department of Materials Science & Engineering, Daejin University, Pochun-si, Kyunggi-do 487–711, Korea (South)
Se-Yon Jung
Affiliation:
Department of Materials Science & Engineering, Daejin University, Pochun-si, Kyunggi-do 487–711, Korea (South)
Seung-Joon Hwang
Affiliation:
Department of Materials Science & Engineering, Daejin University, Pochun-si, Kyunggi-do 487–711, Korea (South)
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Abstract

Pt/Ti/SiO2/Si substrates seeded by SBT nanoparticles (∼60–80 nm) were used to enhance the phase formation kinetics of Sr0.7Bi2.4Ta2O9 (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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 784: Symposium C – Ferroelectric Thin Films XII , 2003 , C11.55
Copyright
Copyright © Materials Research Society 2004

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References

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