High dielectric tunability of Ba0.7Sr0.3TiO3 thin films by compositional fluctuation of Ba/Sr ratio in microregion

Yongping Ding; Jianshen Wu; Zhongyan Meng

doi:10.1117/12.408358

29 November 2000 High dielectric tunability of Ba_0.7Sr_0.3TiO₃ thin films by compositional fluctuation of Ba/Sr ratio in microregion

Yongping Ding, Jianshen Wu, Zhongyan Meng

Author Affiliations +

Proceedings Volume 4086, Fourth International Conference on Thin Film Physics and Applications; (2000) https://doi.org/10.1117/12.408358
Event: 4th International Conference on Thin Film Physics and Applications, 2000, Shanghai, China

Abstract

The perovskite Ba_0.7Sr_0.3TiO₃ 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 (Ba_1-xSr_x)TiO₃ induces the lattice-metastability and promotes the sensitivity of phase transition to electric field, which gives rise to higher dielectric tunability.

Citation Download Citation

Yongping Ding, Jianshen Wu, and Zhongyan Meng "High dielectric tunability of Ba_0.7Sr_0.3TiO₃ thin films by compositional fluctuation of Ba/Sr ratio in microregion", Proc. SPIE 4086, Fourth International Conference on Thin Film Physics and Applications, (29 November 2000); https://doi.org/10.1117/12.408358

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