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–....
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doaj-0c43be7a127d4fd2ac17d1a1b8fcf68c2021-07-23T04:48:40ZengElsevierResults in Physics2211-37972021-08-0127104542Novel pyrochlore-structured bismuth iron antimonates: Structural, impedance and electrochemical studiesF.A. Jusoh0K.B. Tan1Z. Zainal2S.K. Chen3C.C. Khaw4O.J. Lee5R. Balachandran6H.C. Ananda Murthy7Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 Serdang, Selangor, MalaysiaDepartment of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia; Corresponding author.Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 Serdang, Selangor, MalaysiaDepartment of Physics, Faculty of Science, Universiti Putra Malaysia, 43400 Serdang, Selangor, MalaysiaDepartment of Mechanical and Material Engineering, Lee Kong Chian Faculty of Engineering and Science, Universiti Tunku Abdul Rahman, 43000 Bandar Sungai Long, Kajang, Selangor, MalaysiaSchool of Fundamental Science, Universiti Malaysia Terengganu, 21300 Kuala Terengganu, Terengganu, MalaysiaSchool of Electrical Engineering and Computing, Adama Science and Technology University, P.O.Box No. 1888, Adama, EthiopiaSchool of Applied Natural Science, Adama Science and Technology University, P.O.Box No. 1888, Adama, EthiopiaA 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.http://www.sciencedirect.com/science/article/pii/S2211379721006458A. Powders: solid-state reactionC. Dielectric propertiesE. Capacitors: Pyrochlore |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
F.A. Jusoh K.B. Tan Z. Zainal S.K. Chen C.C. Khaw O.J. Lee R. Balachandran H.C. Ananda Murthy |
spellingShingle |
F.A. Jusoh K.B. Tan Z. Zainal S.K. Chen C.C. Khaw O.J. Lee R. Balachandran H.C. Ananda Murthy Novel pyrochlore-structured bismuth iron antimonates: Structural, impedance and electrochemical studies Results in Physics A. Powders: solid-state reaction C. Dielectric properties E. Capacitors: Pyrochlore |
author_facet |
F.A. Jusoh K.B. Tan Z. Zainal S.K. Chen C.C. Khaw O.J. Lee R. Balachandran H.C. Ananda Murthy |
author_sort |
F.A. Jusoh |
title |
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_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_sort |
novel pyrochlore-structured bismuth iron antimonates: structural, impedance and electrochemical studies |
publisher |
Elsevier |
series |
Results in Physics |
issn |
2211-3797 |
publishDate |
2021-08-01 |
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. |
topic |
A. Powders: solid-state reaction C. Dielectric properties E. Capacitors: Pyrochlore |
url |
http://www.sciencedirect.com/science/article/pii/S2211379721006458 |
work_keys_str_mv |
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