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Dielectric Tunability Properties and Thermal Stability of (Ba,Sr,Ca)TiO3 Thin Films Prepared by the Sol-Gel Method

Published online by Cambridge University Press:  26 February 2011

Wei Qin ,
Wanhai Chen ,
Wenbiao Wu ,
Jinrong Cheng  and
Zhongyan Meng
Wei Qin
Affiliation:
qinwei@graduate.shu.edu.cn, Shanghai University, School of Materials Science and Engineering, 149 Yanchang Road, Box 32, Shanghai, 200072, China, People's Republic of
Wanhai Chen
Affiliation:
wanhai_1@graduate.shu.edu.cn, Shanghai University, School of Materials Science and Engineering, 149 Yanchang Road, Box 32, Shanghai, 200072, China, People's Republic of
Wenbiao Wu
Affiliation:
wbwu@mail.shu.edu.cn, Shanghai University, School of Materials Science and Engineering, 149 Yanchang Road, Box 32, Shanghai, 200072, China, People's Republic of
Jinrong Cheng
Affiliation:
jrcheng@staff.shu.edu.cn, Shanghai University, School of Materials Science and Engineering, 149 Yanchang Road, Box 32, Shanghai, 200072, China, People's Republic of
Zhongyan Meng
Affiliation:
zymeng@staff.shu.edu.cn, Shanghai University, School of Materials Science and Engineering, 149 Yanchang Road, Box 32, Shanghai, 200072, China, People's Republic of
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Abstract

A new family of (Ba1-x-ySrxCay)TiO3 (BSCT) thin films was prepared on Pt(111)/TiO2/SiO2/Si substrates by using sol-gel techniques. BSCT thin films with Ba/Sr/Ca ratio of 15/55/30, 20/45/35 and 25/35/40 were investigated, which were selected at the cubic region in the vicinity of the cubic-tetragonal phase boundary according to the ternary phase diagram of BaTiO3-SrTiO3-CaTiO3. X-ray diffraction analysis indicates that BSCT thin films are of the cubic perovskite structure. No hysteresis window can be observed from the capacitance-voltage curves, reflecting that BSCT thin films are in the paraelectric phase. The dielectric constant and tunability of BSCT thin films were investigated in the temperature range of 200–370 K. The Curie temperature Tc increases with increasing Ba concentration.

Keywords

sol-geldielectric propertiesthin film
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 966: Symposium T – Ferroelectrics and Multiferroics , 2006 , 0966-T10-14
Copyright
Copyright © Materials Research Society 2007

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