Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/26551
Title: The effects of composition gradients of BaxSr 1-xTiO3 thin films on their microstructures, dielectric and optical properties
Authors: Tian, HY
Chan, HLW 
Choy, CL 
No, K
Keywords: BST graded film
Optical properties
Structural properties
Tunability
Issue Date: 2003
Publisher: Elsevier
Source: Materials science and engineering. B, Solid-state materials for advanced technology, 2003, v. 103, no. 3, p. 246-252 How to cite?
Journal: Materials science and engineering. B, Solid-state materials for advanced technology 
Abstract: Ferroelectric thin films of BaxSr1-xTiO3 (BST) with artificial gradients in composition normal to the growth surface were prepared on Si and fused quartz substrates by a sol-gel technique. Auger electronic spectroscopy observation shows that composition gradients of Ba and Sr are gradual and uniform without obvious interfaces between the different layers. X-ray diffraction analysis reveals that polycrystalline and perovskite formed at 730 °C. Annealing at higher temperature enhanced grain growth, the lattice parameter decreases with increasing annealing temperatures. The small signal dielectric constant and dielectric loss at 100 kHz were found to be 300 and 0.02. The graded thin film shows a relatively high tunability of 35% at an applied field of 240 kV cm-1. The optical properties were determined at room temperature in the wavelength range of 200-2000 nm from spectrophotometer measurements of the transmittance. The transmittance of the graded thin films increased, and a much weaker and flatter absorption band was found in the absorption spectra.
URI: http://hdl.handle.net/10397/26551
ISSN: 0921-5107
DOI: 10.1016/S0921-5107(03)00241-1
Appears in Collections:Journal/Magazine Article

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

SCOPUSTM   
Citations

16
Last Week
0
Last month
0
Citations as of Sep 24, 2017

WEB OF SCIENCETM
Citations

16
Last Week
0
Last month
0
Citations as of Sep 21, 2017

Page view(s)

33
Last Week
0
Last month
Checked on Sep 24, 2017

Google ScholarTM

Check

Altmetric



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