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

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 Bi4Ti3O1...

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Main Authors: Wong, Yick Jeng, Hassan, Jumiah, Chen, Soo Kien, Ismail, Ismayadi
Format: Article
Language:English
Published: Elsevier 2017
Online Access:http://psasir.upm.edu.my/id/eprint/61152/1/Combined%20effects%20of%20thermal%20treatment%20and%20Er-substitution%20on%20phase%20formation%2C%20microstructure%2C%20and%20dielectric%20responses%20of%20Bi4Ti3O12%20Aurivillius%20ceramics.pdf
http://psasir.upm.edu.my/id/eprint/61152/
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spelling my.upm.eprints.611522018-09-18T01:21:25Z http://psasir.upm.edu.my/id/eprint/61152/ Combined effects of thermal treatment and Er-substitution on phase formation, microstructure, and dielectric responses of Bi4Ti3O12 Aurivillius ceramics Wong, Yick Jeng Hassan, Jumiah Chen, Soo Kien Ismail, Ismayadi 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. Elsevier 2017 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/61152/1/Combined%20effects%20of%20thermal%20treatment%20and%20Er-substitution%20on%20phase%20formation%2C%20microstructure%2C%20and%20dielectric%20responses%20of%20Bi4Ti3O12%20Aurivillius%20ceramics.pdf 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 10.1016/j.jallcom.2017.06.268
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
description 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.
format Article
author Wong, Yick Jeng
Hassan, Jumiah
Chen, Soo Kien
Ismail, Ismayadi
spellingShingle Wong, Yick Jeng
Hassan, Jumiah
Chen, Soo Kien
Ismail, Ismayadi
Combined effects of thermal treatment and Er-substitution on phase formation, microstructure, and dielectric responses of Bi4Ti3O12 Aurivillius ceramics
author_facet Wong, Yick Jeng
Hassan, Jumiah
Chen, Soo Kien
Ismail, Ismayadi
author_sort Wong, Yick Jeng
title Combined effects of thermal treatment and Er-substitution on phase formation, microstructure, and dielectric responses of Bi4Ti3O12 Aurivillius ceramics
title_short Combined effects of thermal treatment and Er-substitution on phase formation, microstructure, and dielectric responses of Bi4Ti3O12 Aurivillius ceramics
title_full Combined effects of thermal treatment and Er-substitution on phase formation, microstructure, and dielectric responses of Bi4Ti3O12 Aurivillius ceramics
title_fullStr Combined effects of thermal treatment and Er-substitution on phase formation, microstructure, and dielectric responses of Bi4Ti3O12 Aurivillius ceramics
title_full_unstemmed Combined effects of thermal treatment and Er-substitution on phase formation, microstructure, and dielectric responses of Bi4Ti3O12 Aurivillius ceramics
title_sort combined effects of thermal treatment and er-substitution on phase formation, microstructure, and dielectric responses of bi4ti3o12 aurivillius ceramics
publisher Elsevier
publishDate 2017
url http://psasir.upm.edu.my/id/eprint/61152/1/Combined%20effects%20of%20thermal%20treatment%20and%20Er-substitution%20on%20phase%20formation%2C%20microstructure%2C%20and%20dielectric%20responses%20of%20Bi4Ti3O12%20Aurivillius%20ceramics.pdf
http://psasir.upm.edu.my/id/eprint/61152/
_version_ 1643837516394004480
score 13.211869

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