PolyU IR

PolyU Institutional Repository >
Applied Physics >
AP Journal/Magazine Articles >

Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/463

Title: Microstructure of compositionally-graded (Ba[sub 1-x]Sr[sub x])TiO₃ thin films epitaxially grown on La[sub 0.5]Sr[sub 0.5]CoO₃-covered (100) LaAlO₃ substrates by pulsed laser deposition
Authors: Zhu, Xinhua
Chan, Helen L. W.
Choy, Chung-loong
Wong, Kin-hung
Hesse, Dietrich
Subjects: Barium compounds
Strontium compounds
Dielectric thin films
Epitaxial layers
Microwave materials
Pulsed laser deposition
X-ray diffraction
Electron diffraction
Transmission electron microscopy
Grain size
Voids (solid)
Issue Date: 14-Apr-2005
Publisher: American Institute of Physics
Citation: Journal of applied physics, 14 Apr. 2005, v. 97, 093503, p. 1-5
Abstract: Compositionally-graded (Ba[sub 1−x]Sr[sub x]dTiO₃ (BST) epitaxial thin films (with x decreasing from 0.25 to 0.0) were deposited by pulsed laser deposition on (100)LaAlO₃ (LAO) single-crystal substrates covered with a conductive La[sub 0.5]Sr[sub 0.5]CoO₃ (LSCO) layer as a bottom electrode. X-ray and electron diffraction patterns demonstrate that the entire graded film has a single-crystal cubic structure. The epitaxial relationship between BST, LSCO, and LAO can be described as (100)[sub BST]||(100)[sub LSCO]||(100)[sub LAO]; [001][sub BST]||[001][sub LSCO]||[001][sub LAO]. Cross-sectional transmission electron microscopy (TEM) images reveal that both the BST films and the LSCO bottom electrodes have sharp interfaces and overall uniform thickness across the entire specimen, and that they grow with a columnar structure. Planar TEM images show that the graded films exhibit granular and/or polyhedral morphologies with an average grain size of 50 nm. High-resolution TEM images reveal aligned rectangular-shaped voids in the graded BST film, with length size of 12-17 nm, and width of 5-8 nm along the <001> direction in the (100) plane.
Rights: © 2005 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in X. Zhu et al. J. Appl. Phys. 97, 093503 (2005) and may be found at http://link.aip.org/link/?jap/97/093503
Type: Journal/Magazine Article
URI: http://hdl.handle.net/10397/463
ISSN: 00218979
Appears in Collections:MRC Journal/Magazine Articles
AP Journal/Magazine Articles

Files in This Item:

File Description SizeFormat
compositionally-graded_05.pdf840.33 kBAdobe PDFView/Open

Facebook Facebook del.icio.us del.icio.us LinkedIn LinkedIn

All items in the PolyU Institutional Repository are protected by copyright, with all rights reserved, unless otherwise indicated.
No item in the PolyU IR may be reproduced for commercial or resale purposes.


© Pao Yue-kong Library, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
Powered by DSpace (Version 1.5.2)  © MIT and HP
Feedback | Privacy Policy Statement | Copyright & Restrictions - Feedback