Rod-like incipient ferroelectric SrTiO3 polycrystal with crystal-axis orientation

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Date

2020

Journal Title

Journal ISSN

Volume Title

Publisher

Elsevier

Abstract

Strontium titanate (SrTiO3, ST) is an incipient ferroelectric material. Generally, a one-dimensional (1D) ST polycrystal is difficult to obtain because of its high aspect ratio and directional orientation. We prepared a 1D ST polycrystal from a layered H2Ti4O9·H2O (HT) single crystal via a solvothermal soft chemical process. The 1D ST polycrystal fabricated from ST nanocrystals has a [010] crystal axis, implying that it is a mesocrystal. The ST nanocrystals were grown not only on the surfaces but also in the interlayers of the original HT matrix. The formation mechanism of the ST mesocrystal is based on a topochemical mesocrystal conversion process. ST ceramics fabricated from ST mesocrystal powder present a lossy capacitor response and excellent energy-storage capabilities owing to the presence of locally oriented ST nanocrystals with a lattice mismatch in the rod-like ST mesocrystals. The investigations performed in this study can set a new benchmark for the development of new electric ST-based materials.

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Keywords

H2Ti4O9·H2O single crystal, SrTiO3 polycrystal, Solvothermal process, Ferroelectric

Citation

Zhang, Z., Miao, L., Yao, M., Li, L., Zhao, F., Gu, H., Han, Y., Sewvandi, G. A., Feng, Q., Yang, D., Wang, X., & Hu, D. (2020). Rod-like incipient ferroelectric SrTiO3 polycrystal with crystal-axis orientation. Ceramics International, 46(3), 3675–3687. https://doi.org/10.1016/j.ceramint.2019.10.088