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Title: High tunability in compositionally graded epitaxial barium strontium titanate thin films by pulsed-laser deposition
Authors: Lu, SG
Zhu, XH
Mak, CL 
Wong, KH
Chan, HLW 
Choy, CL 
Issue Date: 28-Apr-2003
Source: Applied physics letters, 28 Apr. 2003, v. 82, no. 17, p.2877-2879
Abstract: Compositionally graded barium strontium titanate [(Ba[sub x]Sr[sub 1-x])TiO₃—BST, x=0.75, 0.8, 0.9, and 1.0] thin films are fabricated by pulsed-laser deposition on a LaAlO₃ substrate with (La[sub 0.7]Sr[sub 0.3])MnO₃ as the bottom electrode. A high dielectric permittivity and temperature characteristic without Curie-Weiss law are obtained. A tunability of over 70% is obtained at frequency of 1 MHz, which is higher than that of single BST layer with the same compositions. All the results indicate that the graded thin films have better electrical properties than a single-layer film.
Keywords: Barium compounds
Strontium compounds
Epitaxial layers
Relaxor ferroelectrics
Ferroelectric thin films
Permittivity
Pulsed laser deposition
Publisher: American Institute of Physics
Journal: Applied physics letters 
ISSN: 0003-6951
EISSN: 1077-3118
Rights: © 2003 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 S.G. Lu et al. Appl. Phys. Lett. 82, 2877 (2003) and may be found at http://link.aip.org/link/?apl/82/2877
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