Novel pyrochlores in the Bi2O3-Fe2O3-Ta2O5 (BFT) ternary system: synthesis, structural and electrical properties
The purpose of this work is to present a systematic study related to the doping mechanism, structural and electrical properties of the novel pyrochlores in the Bi2O3-Fe2O3-Ta2O5 (BFT) system. The pyrochlores with the general formula of Bi3.36Fe2.08+xTa2.56-xO14.56-x (-0.32 ≤ x ≤ 0.48) were prepared...
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| Format: | Article |
| Language: | English |
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Elsevier
2020
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| Online Access: | http://psasir.upm.edu.my/id/eprint/86926/ http://psasir.upm.edu.my/id/eprint/86926/1/Novel%20pyrochlores.pdf |
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| author | Jusoh, Farah Aishah Tan, Kar Ban Zainal, Zulkarnain Chen, Soo Kien Khaw, Chwin Chieh Lee, Oon Jew |
| author_facet | Jusoh, Farah Aishah Tan, Kar Ban Zainal, Zulkarnain Chen, Soo Kien Khaw, Chwin Chieh Lee, Oon Jew |
| author_sort | Jusoh, Farah Aishah |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | The purpose of this work is to present a systematic study related to the doping mechanism, structural and electrical properties of the novel pyrochlores in the Bi2O3-Fe2O3-Ta2O5 (BFT) system. The pyrochlores with the general formula of Bi3.36Fe2.08+xTa2.56-xO14.56-x (-0.32 ≤ x ≤ 0.48) were prepared through solid-state reaction at 975 °C for 48 h. The subsolidus solution formation involved a mechanism of x Ta5+ + x O2− ↔ x Fe3+. These phase-pure BFT pyrochlores had a cubic structure with a space group of Fd3m (No. 227), Z = 4. Their lattice parameters were found to vary insignificantly within the range 10.4979 (8)-10.5033 (1) Å. The crystallite sizes determined by Scherrer and Williamson–Hall methods showed a good agreement with their values found to be in the range ∼57−78 nm. Meanwhile, the larger grain sizes in the range 0.2−4.7 μm were measured by the scanning electron microscopy (SEM) analysis. BFT pyrochlores were also found to be high refractory and thermally stable by the thermal analyses. These highly insulating pyrochlores exhibited high activation energies, ∼0.87−1.10 eV; moderate high dielectric constants, ∼78–92 and dielectric losses, ∼10-1 at 1 MHz and ∼30 °C. As such, these dielectric materials could be attractive candidates for potential application in low temperature co-fired ceramic (LTCC). |
| first_indexed | 2025-11-15T12:43:24Z |
| format | Article |
| id | upm-86926 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T12:43:24Z |
| publishDate | 2020 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-869262022-01-05T08:33:28Z http://psasir.upm.edu.my/id/eprint/86926/ Novel pyrochlores in the Bi2O3-Fe2O3-Ta2O5 (BFT) ternary system: synthesis, structural and electrical properties Jusoh, Farah Aishah Tan, Kar Ban Zainal, Zulkarnain Chen, Soo Kien Khaw, Chwin Chieh Lee, Oon Jew The purpose of this work is to present a systematic study related to the doping mechanism, structural and electrical properties of the novel pyrochlores in the Bi2O3-Fe2O3-Ta2O5 (BFT) system. The pyrochlores with the general formula of Bi3.36Fe2.08+xTa2.56-xO14.56-x (-0.32 ≤ x ≤ 0.48) were prepared through solid-state reaction at 975 °C for 48 h. The subsolidus solution formation involved a mechanism of x Ta5+ + x O2− ↔ x Fe3+. These phase-pure BFT pyrochlores had a cubic structure with a space group of Fd3m (No. 227), Z = 4. Their lattice parameters were found to vary insignificantly within the range 10.4979 (8)-10.5033 (1) Å. The crystallite sizes determined by Scherrer and Williamson–Hall methods showed a good agreement with their values found to be in the range ∼57−78 nm. Meanwhile, the larger grain sizes in the range 0.2−4.7 μm were measured by the scanning electron microscopy (SEM) analysis. BFT pyrochlores were also found to be high refractory and thermally stable by the thermal analyses. These highly insulating pyrochlores exhibited high activation energies, ∼0.87−1.10 eV; moderate high dielectric constants, ∼78–92 and dielectric losses, ∼10-1 at 1 MHz and ∼30 °C. As such, these dielectric materials could be attractive candidates for potential application in low temperature co-fired ceramic (LTCC). Elsevier 2020-09 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/86926/1/Novel%20pyrochlores.pdf Jusoh, Farah Aishah and Tan, Kar Ban and Zainal, Zulkarnain and Chen, Soo Kien and Khaw, Chwin Chieh and Lee, Oon Jew (2020) Novel pyrochlores in the Bi2O3-Fe2O3-Ta2O5 (BFT) ternary system: synthesis, structural and electrical properties. Journal of Materials Research and Technology, 9 (5). 11022 - 11034. ISSN 2238-7854; ESSN: 2214-0697 https://www.sciencedirect.com/science/article/pii/S2238785420315982 10.1016/j.jmrt.2020.07.102 |
| spellingShingle | Jusoh, Farah Aishah Tan, Kar Ban Zainal, Zulkarnain Chen, Soo Kien Khaw, Chwin Chieh Lee, Oon Jew Novel pyrochlores in the Bi2O3-Fe2O3-Ta2O5 (BFT) ternary system: synthesis, structural and electrical properties |
| title | Novel pyrochlores in the Bi2O3-Fe2O3-Ta2O5 (BFT) ternary system: synthesis, structural and electrical properties |
| title_full | Novel pyrochlores in the Bi2O3-Fe2O3-Ta2O5 (BFT) ternary system: synthesis, structural and electrical properties |
| title_fullStr | Novel pyrochlores in the Bi2O3-Fe2O3-Ta2O5 (BFT) ternary system: synthesis, structural and electrical properties |
| title_full_unstemmed | Novel pyrochlores in the Bi2O3-Fe2O3-Ta2O5 (BFT) ternary system: synthesis, structural and electrical properties |
| title_short | Novel pyrochlores in the Bi2O3-Fe2O3-Ta2O5 (BFT) ternary system: synthesis, structural and electrical properties |
| title_sort | novel pyrochlores in the bi2o3-fe2o3-ta2o5 (bft) ternary system: synthesis, structural and electrical properties |
| url | http://psasir.upm.edu.my/id/eprint/86926/ http://psasir.upm.edu.my/id/eprint/86926/ http://psasir.upm.edu.my/id/eprint/86926/ http://psasir.upm.edu.my/id/eprint/86926/1/Novel%20pyrochlores.pdf |