Novel pyrochlore-structured bismuth iron antimonates: structural, impedance and electrochemical studies
A moderate pyrochlore solid solution range of 0.00 ≤ x ≤ 0.64 was observed in the Bi3.36Fe2.08+xSb2.56-xO14.56-x (BFS) system prepared by solid-state reaction at 925 ◦C for 2 days. The overall charge compensation required a one-to-one cationic replacement and oxygen vacancies, i.e. Sb5+ ↔Fe3+ - O2...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Published: |
Elsevier
2021
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| Online Access: | http://psasir.upm.edu.my/id/eprint/94382/ |
| _version_ | 1848861982009065472 |
|---|---|
| author | Jusoh, F. A. Tan, K. B. Zainal, Z. Chen, S. K. Khaw, C. C. Lee, O. J. Balachandran, R. Ananda Murthy, H. C. |
| author_facet | Jusoh, F. A. Tan, K. B. Zainal, Z. Chen, S. K. Khaw, C. C. Lee, O. J. Balachandran, R. Ananda Murthy, H. C. |
| author_sort | Jusoh, F. A. |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | A moderate pyrochlore solid solution range of 0.00 ≤ x ≤ 0.64 was observed in the Bi3.36Fe2.08+xSb2.56-xO14.56-x
(BFS) system prepared by solid-state reaction at 925 ◦C for 2 days. The overall charge compensation required a
one-to-one cationic replacement and oxygen vacancies, i.e. Sb5+ ↔Fe3+ - O2–
. BFS cubic pyrochlores showed
their refined lattice parameters varying linearly in the range of 10.4284 (8)-10.4513(8), thus obeying the
Vegard’s rule. The measured crystallite sizes by both Scherrer and Williamson-Hall methods were found to be in
the range of 46–67 nm; whilst, the larger grain sizes in the range of 0.2–2.9 μm were calculated using scanning
electron microscopy (SEM) analysis. The AC impedance analysis also verified a few electrical responses of BFS
pyrochlores: (i) BFS pyrochlores had moderate dielectric constants in the range of 24–35 and dielectric losses in
the order of 10− 1 at room temperature and 1 MHz, (ii) BFS pyrochlores were not electrically homogeneous with
bulk capacitances in the order of 10− 12 Fcm− 1
, (iii) a non-Debye type and temperature-dependent relaxation
process were discernible and (iv) the movement of charge carrier were either in the long-range or short-range
migration subjected to time availability. In addition, BFS pyrochlore thin films had a good capacitive behaviour and electrochemical reversibility, according to the cyclic voltammetry (CV) and galvanostatic charge–discharge (GCD) analyses. All these excellent properties rendered BFS pyrochlores to be a suitable material
for Class 1 ceramic capacitors. |
| first_indexed | 2025-11-15T13:09:46Z |
| format | Article |
| id | upm-94382 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-15T13:09:46Z |
| publishDate | 2021 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-943822023-04-04T06:53:20Z http://psasir.upm.edu.my/id/eprint/94382/ Novel pyrochlore-structured bismuth iron antimonates: structural, impedance and electrochemical studies Jusoh, F. A. Tan, K. B. Zainal, Z. Chen, S. K. Khaw, C. C. Lee, O. J. Balachandran, R. Ananda Murthy, H. C. A moderate pyrochlore solid solution range of 0.00 ≤ x ≤ 0.64 was observed in the Bi3.36Fe2.08+xSb2.56-xO14.56-x (BFS) system prepared by solid-state reaction at 925 ◦C for 2 days. The overall charge compensation required a one-to-one cationic replacement and oxygen vacancies, i.e. Sb5+ ↔Fe3+ - O2– . BFS cubic pyrochlores showed their refined lattice parameters varying linearly in the range of 10.4284 (8)-10.4513(8), thus obeying the Vegard’s rule. The measured crystallite sizes by both Scherrer and Williamson-Hall methods were found to be in the range of 46–67 nm; whilst, the larger grain sizes in the range of 0.2–2.9 μm were calculated using scanning electron microscopy (SEM) analysis. The AC impedance analysis also verified a few electrical responses of BFS pyrochlores: (i) BFS pyrochlores had moderate dielectric constants in the range of 24–35 and dielectric losses in the order of 10− 1 at room temperature and 1 MHz, (ii) BFS pyrochlores were not electrically homogeneous with bulk capacitances in the order of 10− 12 Fcm− 1 , (iii) a non-Debye type and temperature-dependent relaxation process were discernible and (iv) the movement of charge carrier were either in the long-range or short-range migration subjected to time availability. In addition, BFS pyrochlore thin films had a good capacitive behaviour and electrochemical reversibility, according to the cyclic voltammetry (CV) and galvanostatic charge–discharge (GCD) analyses. All these excellent properties rendered BFS pyrochlores to be a suitable material for Class 1 ceramic capacitors. Elsevier 2021-08 Article PeerReviewed Jusoh, F. A. and Tan, K. B. and Zainal, Z. and Chen, S. K. and Khaw, C. C. and Lee, O. J. and Balachandran, R. and Ananda Murthy, H. C. (2021) Novel pyrochlore-structured bismuth iron antimonates: structural, impedance and electrochemical studies. Results in Physics, 27. art. no. 104542. pp. 1-44. ISSN 2211-3797 https://www.sciencedirect.com/science/article/pii/S2211379721006458?via%3Dihub 10.1016/j.rinp.2021.104542 |
| spellingShingle | Jusoh, F. A. Tan, K. B. Zainal, Z. Chen, S. K. Khaw, C. C. Lee, O. J. Balachandran, R. Ananda Murthy, H. C. Novel pyrochlore-structured bismuth iron antimonates: structural, impedance and electrochemical studies |
| title | Novel pyrochlore-structured bismuth iron antimonates: structural, impedance and electrochemical studies |
| title_full | Novel pyrochlore-structured bismuth iron antimonates: structural, impedance and electrochemical studies |
| title_fullStr | Novel pyrochlore-structured bismuth iron antimonates: structural, impedance and electrochemical studies |
| title_full_unstemmed | Novel pyrochlore-structured bismuth iron antimonates: structural, impedance and electrochemical studies |
| title_short | Novel pyrochlore-structured bismuth iron antimonates: structural, impedance and electrochemical studies |
| title_sort | novel pyrochlore-structured bismuth iron antimonates: structural, impedance and electrochemical studies |
| url | http://psasir.upm.edu.my/id/eprint/94382/ http://psasir.upm.edu.my/id/eprint/94382/ http://psasir.upm.edu.my/id/eprint/94382/ |