Ferroelectric and photocatalytic properties of Aurivillius phase Ca2Bi4Ti5O18

Aurivillius phase Ca2Bi4Ti5O18 powders with micrometer size were produced by solid‐state 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 piezoelectri...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the American Ceramic Society 2021-01, Vol.104 (1), p.322-328
Main Authors: Wang, Yaqiong, Zhang, Man, Wu, Jiyue, Hu, Zimeng, Zhang, Hongtao, Yan, Haixue
Format: Article
Language:English
Subjects:
Absorption spectra
Aurivillius phase
Bismuth compounds
Ca2Bi4Ti5O18
Catalytic activity
Curie temperature
Degradation
Ferroelectric materials
Ferroelectricity
ferroelectrics
Irradiation
Nanoparticles
Oxidation
Perovskite structure
Photocatalysis
photocatalysts
Piezoelectricity
Rhodamine
Silver
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Aurivillius phase Ca2Bi4Ti5O18 powders with micrometer size were produced by solid‐state 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 hours UV‐vis irradiation. With Ag nanoparticles deposited on the Ca2Bi4Ti5O18 powders surface, 50% of RhB was 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.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.17466