jace.17466.pdf (825.92 kB)
Download file

Ferroelectric and photocatalytic properties of Aurivillius phase Ca2Bi4Ti5O18

Download (825.92 kB)
journal contribution
posted on 24.08.2020, 10:19 by Yaqiong Wang, Man Zhang, Jiyue Wu, Zimeng Hu, Hongtao ZhangHongtao Zhang, Haixue Yan
Aurivillius phase Ca2Bi4Ti5O18 powders with micrometer size were produced by solidstate reaction. X-ray diffraction revealed that the powders had polar orthorhombic structure with space group of B2cb. Ca2Bi4Ti5O18 ceramic exhibited frequency independent dielectric anomaly at 774 °C. The piezoelectric coefficient d33 value of poled Ca2Bi4Ti5O18 pellets was 0.7±0.2 pC/N. Both frequency independent dielectric anomaly and detectable d33 value clearly indicated that Ca2Bi4Ti5O18 is a ferroelectric material with Curie point of 774 ℃. UV–vis absorption spectra revealed that Ca2Bi4Ti5O18 had a direct band gap of 3.2 eV. Photocatalytic activity of the Ca2Bi4Ti5O18 powders was examined by degradation of rhodamine B (RhB) under simulated solar light. 16% of RhB solution was degraded by Ca2Bi4Ti5O18 powders after 4 h UV-vis irradiation. With Ag nanoparticles deposited on the Ca2Bi4Ti5O18 powders surface, 50% of RhB were degraded under the same irradiation condition. The fitted degradation rate constant of Ag decorated Ca2Bi4Ti5O18 was 4 times higher than that of bare Ca2Bi4Ti5O18. This work suggested that the Aurivillius ferroelectric Ca2Bi4Ti5O18 is a promising candidate for photocatalytic applications.

History

School

  • Science

Department

  • Materials

Published in

Journal of the American Ceramic Society

Volume

104

Issue

1

Pages

322 - 328

Citation

Wang, Y.... et al. (2021). Ferroelectric and photocatalytic properties of Aurivillius phase Ca2Bi4Ti5O18. Journal of the American Ceramic Society, 104 (1), pp.322-328.

Publisher

Wiley

Version

VoR (Version of Record)

Rights holder

© The authors

Publisher statement

This is an Open Access Article. It is published by Wiley under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/

Acceptance date

23/08/2020

Publication date

2020-09-17

Copyright date

2020

ISSN

0002-7820

eISSN

1551-2916

Language

en

Depositor

Dr Hongtao Zhang Deposit date: 23 August 2020