UPM Institutional Repository

Combined effects of thermal treatment and Er-substitution on phase formation, microstructure, and dielectric responses of Bi4Ti3O12 Aurivillius ceramics


Citation

Wong, Yick Jeng and Hassan, Jumiah and Chen, Soo Kien and Ismail, Ismayadi (2017) Combined effects of thermal treatment and Er-substitution on phase formation, microstructure, and dielectric responses of Bi4Ti3O12 Aurivillius ceramics. Journal of Alloys and Compounds, 723. 567 - 579. ISSN 0925-8388; ESSN: 1873-4669

Abstract

The combined effects of thermal treatment and single erbium (Er3+) ion-substitution (x = 0.75) on the A-site of Bi4-xErxTi3O12 compounds were investigated by scrutinizing the crystal structure, microstructural evolution, and dielectric properties. The results are compared with those of pure Bi4Ti3O12 compounds. Upon doping, the crystal structures experienced strong octahedral distortions, resulting in phase transformation from orthorhombic to monoclinic symmetry. The doped samples became highly anisotropic with increasing sintering temperature, which are accompanied by negative thermal expansion. Following the phase transformation, plate-like grains emerged at the expense of equiaxed grains, becoming more dominant as grain growth increased with sintering temperature. The grain growth rate is comparatively slower in the doped samples, implying the inhibiting role of Er. The doped samples showed relatively small loss of ε” characterized by shorter relaxation times, which compromised the dielectric constant ε′ due to the suppression of oxygen vacancies that is closely related to the smaller grain sizes and densities. Both ε′ and ε” of pure and doped samples are grain size dependent, in which the frequency responses followed the superposition of Cole-Cole and Havriliak-Negami distribution functions that correlates with the impedance studies.


Download File

[img]
Preview
Text (Abstract)
Combined effects of thermal treatment and Er-substitution on phase formation, microstructure, and dielectric responses of Bi4Ti3O12 Aurivillius ceramics.pdf

Download (107kB) | Preview

Additional Metadata

Item Type: Article
Divisions: Faculty of Science
Institute of Advanced Technology
DOI Number: https://doi.org/10.1016/j.jallcom.2017.06.268
Publisher: Elsevier
Keywords: Ferroelectrics; High-energy ball milling; X-ray diffraction; Dielectric response
Depositing User: Nida Hidayati Ghazali
Date Deposited: 18 Sep 2018 01:21
Last Modified: 18 Sep 2018 01:21
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.jallcom.2017.06.268
URI: http://psasir.upm.edu.my/id/eprint/61152
Statistic Details: View Download Statistic

Actions (login required)

View Item View Item