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Single-crystal and Nano-columnar Growth of Gadolinium-doped Ceria Thin Films on Oxide Substrates Studied Using Electron Microscopy

Published online by Cambridge University Press:  01 February 2011

D. X. Huang ,
C. L. Chen  and
A. J. Jacobson
D. X. Huang
Affiliation:
Center of Materials Chemistry, University of Houston Houston, TX 77204–5003, USA.
C. L. Chen
Affiliation:
Center of Materials Chemistry, University of Houston Houston, TX 77204–5003, USA.
A. J. Jacobson
Affiliation:
Center of Materials Chemistry, University of Houston Houston, TX 77204–5003, USA.
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Abstract

Gadolinium-doped ceria (GDC) thin films were grown by pulsed laser ablation on various oxide single crystal substrates including MgO, YSZ, LAO, NGO, and STO with different film-substrate lattice mismatch ratios. The film microstructures were characterized mainly by using electron microscopy. A clear influence of the filmsubstrate lattice mismatch on the film crystallinity has been observed. The GDC films usually exhibit columnar grain growth for a large range of film-substrate lattice mismatch ratios. A cube-on-cube growth of GDC film on MgO has been observed with a surprisingly high lattice mismatch ratio of 28%. The highest film crystallinity is obtained on the LAO substrates under a small compressive strain. This single-crystalline GDC film shows no columnar grain growth but presents a novel directionally-aligned precipitated Gd-rich nanoparticle system, which plays a specific role in relaxing various kinds of strain fields induced during the thin film growth to ensure the film crystallinity.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 795: Symposium U – Thin Films - Stresses and Mechanical Properties X , 2003 , U5.9
Copyright
Copyright © Materials Research Society 2004

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References

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