Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/33107
Title: Microstructures and dielectric properties of compositionally graded (Ba1-xSrx) TiO3 thin films prepared by pulsed laser deposition
Authors: Zhu, X
Lu, S
Chan, HLW 
Choy, CL 
Wong, KH
Issue Date: 2003
Publisher: Springer
Source: Applied physics. A, Materials science & processing, 2003, v. 76, no. 2, p. 225-229 How to cite?
Journal: Applied physics. A, Materials science & processing 
Abstract: Compositionally graded Ba1-xSrx)TiO3 (BST) (x: 0.0 - 0.25) thin films were grown on Pt(111)/TiO2/SiO2/ Si (100) substrates using layer-by-layer pulsed laser deposition in the temperature range 550-650 °C. Both downgraded (Ba/Sr ratio varying from 100/0 at the bottom surface to 75/25 at the top surface) and upgraded (Ba/Sr ratio varying from 75/25 at the bottom surface to 100/0 at the top surface) BST films were prepared. Their microstructures were systematically studied by X-ray diffractometry and scanning electron microscopy. A grain morphology transition from large 'rosettes' (> 0.30 μm) to small compact grains (70-110 nm) was observed in the down-graded BST films as the deposition temperature was increased from 550 to 650 °C. No such grain morphology transition was detected in the upgraded BST films. Dielectric measurements with metal electrodes revealed an enhanced dielectric behavior in the downgraded films. This enhancement is mainly attributed to the large compressive stress field built up near the interface between the downgraded film and substrate. Furthermore, the BaTiO3 layer in the downgraded BST films not only serves as a bottom layer but also as an excellent seeding layer for enhancing the crystallization of the subsequent film layers in the downgraded films.
URI: http://hdl.handle.net/10397/33107
ISSN: 0947-8396
EISSN: 1432-0630
DOI: 10.1007/s003390201428
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

28
Last Week
0
Last month
0
Citations as of Sep 10, 2017

WEB OF SCIENCETM
Citations

26
Last Week
0
Last month
1
Citations as of Sep 13, 2017

Page view(s)

31
Last Week
1
Last month
Checked on Sep 17, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.