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Proceedings Paper

High dielectric tunability of Ba0.7Sr0.3TiO3 thin films by compositional fluctuation of Ba/Sr ratio in microregion
Author(s): Yongping Ding; Jianshen Wu; Zhongyan Meng
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Paper Abstract

The perovskite Ba0.7Sr0.3TiO3 thin films were fabricated by a sol-gel method with two kinds of microstructures, which are characterized were by fluctuant and homogeneous distribution of Ba/Sr ratio in micro-region respectively. It is found that the films with compositional inhomogeneity have higher dielectric tunability than that of the films with compositional homogeneity, 32% and 13% respectively at the bias field of 100 kv/cm. From the TEM observation, we found the micro-domain clusters with domain- width of 2 - 5 nm. We proposed that the compositional heterogeneity of Ba and Sr in `A' sites of (Ba1-xSrx)TiO3 induces the lattice-metastability and promotes the sensitivity of phase transition to electric field, which gives rise to higher dielectric tunability.

Paper Details

Date Published: 29 November 2000
PDF: 4 pages
Proc. SPIE 4086, Fourth International Conference on Thin Film Physics and Applications, (29 November 2000); doi: 10.1117/12.408358
Show Author Affiliations
Yongping Ding, Shanghai Jiao Tong Univ. (China)
Jianshen Wu, Shanghai Jiao Tong Univ. (China)
Zhongyan Meng, Shanghai Univ. (China)

Published in SPIE Proceedings Vol. 4086:
Fourth International Conference on Thin Film Physics and Applications

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