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Journal of Sol-Gel Science and Technology
Published in: Journal of Sol-Gel Science and Technology 2/2021

16-07-2021 | Original Paper: Functional coatings, thin films and membranes (including deposition techniques)

Grain size engineering and growth mechanism in hydrothermal synthesis of Bi0.5Na0.5TiO3 thin films on Nb-doped SrTiO3 substrates

Authors: Fujun Chen, Hao Qian, Xiaoyuan Sun, Mu Song, Yunfei Liu, Yinong Lyu

Published in: Journal of Sol-Gel Science and Technology | Issue 2/2021

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Abstract

Considering the full utilization of energy and pursuing thin-film capacitors with high energy-storage density, the grain size engineering is used to adjust domain size, in order to enhance the energy-storage efficiency and energy-storage density of thin-film capacitors. Therefore, in this work, lead-free Bi0.5Na0.5TiO3 (BNT) films with designed grain size were grown on Nb-doped SrTiO3 (Nb:STO) (001) single-crystalline substrates by modulating the mineralizer concentrations via hydrothermal synthesis. The nature of epitaxial growth near the single-crystalline substrates was proved by transmission electron microscopy (TEM). In addition, the phenomenon of the decrease of grain size and the increase of [100] in-plane orientation with the decline of mineralizer concentrations were clarified by grazing-angle incidence X-ray diffraction (GIXRD) and field emission scanning electron microscope (FESEM). By reducing the grain size, an ultrahigh energy-storage efficiency (η) of 75.56% and superior the recoverable energy-storage density (Wrec) of 16.47 J/cm3 were acquired in pure Bi0.5Na0.5TiO3 films. Furthermore, the fine-grained film exhibits weak dependence on the frequency and has excellent anti-fatigue property. Therefore, hydrothermal synthesis is an efficient, inexpensive, and easy method, which is the most promising way to adjust grain size and energy storage of the film capacitor.
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Metadata
Title
Grain size engineering and growth mechanism in hydrothermal synthesis of Bi0.5Na0.5TiO3 thin films on Nb-doped SrTiO3 substrates
Authors
Fujun Chen
Hao Qian
Xiaoyuan Sun
Mu Song
Yunfei Liu
Yinong Lyu
Publication date
16-07-2021
Publisher
Springer US
Published in
Journal of Sol-Gel Science and Technology / Issue 2/2021
Print ISSN: 0928-0707
Electronic ISSN: 1573-4846
DOI
https://doi.org/10.1007/s10971-021-05586-y

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