Influence of Nb2O5 substitution on the structural and electrical properties of Bi3TaO7 ceramics
Herein we report the doping mechanism and impedance study of the Nb-substituted Bi3Ta1-xNbxO7 (0 ≤ x ≤ 0.5) prepared via conventional solid-state method at 900 °C over 24 h. The substitutional solid solution crystallised in a cubic fluorite structure, space group Fm-3m and with lattice parameter, a ...
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| Language: | English |
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Elsevier
2018
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| Online Access: | http://psasir.upm.edu.my/id/eprint/74666/ http://psasir.upm.edu.my/id/eprint/74666/1/Influence%20of%20Nb2O5.pdf |
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| author | Firman, K. Tan, K.B. Khaw, C.C. Zainal, Z. Tan, Y.P. Chen, S.K. |
| author_facet | Firman, K. Tan, K.B. Khaw, C.C. Zainal, Z. Tan, Y.P. Chen, S.K. |
| author_sort | Firman, K. |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | Herein we report the doping mechanism and impedance study of the Nb-substituted Bi3Ta1-xNbxO7 (0 ≤ x ≤ 0.5) prepared via conventional solid-state method at 900 °C over 24 h. The substitutional solid solution crystallised in a cubic fluorite structure, space group Fm-3m and with lattice parameter, a = b = c, in the range 5.4477 (±0.0037)–5.4654 (±0.0011) Å. An insignificant unit cell expansion was observed with increasing Nb2O5 content and the linear correlation between lattice parameter and composition variable showed that the Vegard's Law was obeyed. Both TGA and DTA analyses confirmed that the Bi3Ta1-xNbxO7 solid solution was thermally stable as neither phase transition nor weight loss was observed within the studied temperature range, ∼28 °C–1000 °C. The electrical conductivities of these samples were found to increase with increasing Nb concentration; the Bi3Ta0.5Nb0.5O7 exhibited the highest conductivity, ∼1.2 × 10−2 S cm−1 at 700 °C with a low activation energy of 1.03 eV. |
| first_indexed | 2025-11-15T11:59:04Z |
| format | Article |
| id | upm-74666 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T11:59:04Z |
| publishDate | 2018 |
| publisher | Elsevier |
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| spelling | upm-746662020-03-17T08:16:19Z http://psasir.upm.edu.my/id/eprint/74666/ Influence of Nb2O5 substitution on the structural and electrical properties of Bi3TaO7 ceramics Firman, K. Tan, K.B. Khaw, C.C. Zainal, Z. Tan, Y.P. Chen, S.K. Herein we report the doping mechanism and impedance study of the Nb-substituted Bi3Ta1-xNbxO7 (0 ≤ x ≤ 0.5) prepared via conventional solid-state method at 900 °C over 24 h. The substitutional solid solution crystallised in a cubic fluorite structure, space group Fm-3m and with lattice parameter, a = b = c, in the range 5.4477 (±0.0037)–5.4654 (±0.0011) Å. An insignificant unit cell expansion was observed with increasing Nb2O5 content and the linear correlation between lattice parameter and composition variable showed that the Vegard's Law was obeyed. Both TGA and DTA analyses confirmed that the Bi3Ta1-xNbxO7 solid solution was thermally stable as neither phase transition nor weight loss was observed within the studied temperature range, ∼28 °C–1000 °C. The electrical conductivities of these samples were found to increase with increasing Nb concentration; the Bi3Ta0.5Nb0.5O7 exhibited the highest conductivity, ∼1.2 × 10−2 S cm−1 at 700 °C with a low activation energy of 1.03 eV. Elsevier 2018-08 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/74666/1/Influence%20of%20Nb2O5.pdf Firman, K. and Tan, K.B. and Khaw, C.C. and Zainal, Z. and Tan, Y.P. and Chen, S.K. (2018) Influence of Nb2O5 substitution on the structural and electrical properties of Bi3TaO7 ceramics. Materials Chemistry and Physics, 214. 464 - 471. ISSN 0254-0584 10.1016/j.matchemphys.2018.04.095 |
| spellingShingle | Firman, K. Tan, K.B. Khaw, C.C. Zainal, Z. Tan, Y.P. Chen, S.K. Influence of Nb2O5 substitution on the structural and electrical properties of Bi3TaO7 ceramics |
| title | Influence of Nb2O5 substitution on the structural and electrical properties of Bi3TaO7 ceramics |
| title_full | Influence of Nb2O5 substitution on the structural and electrical properties of Bi3TaO7 ceramics |
| title_fullStr | Influence of Nb2O5 substitution on the structural and electrical properties of Bi3TaO7 ceramics |
| title_full_unstemmed | Influence of Nb2O5 substitution on the structural and electrical properties of Bi3TaO7 ceramics |
| title_short | Influence of Nb2O5 substitution on the structural and electrical properties of Bi3TaO7 ceramics |
| title_sort | influence of nb2o5 substitution on the structural and electrical properties of bi3tao7 ceramics |
| url | http://psasir.upm.edu.my/id/eprint/74666/ http://psasir.upm.edu.my/id/eprint/74666/ http://psasir.upm.edu.my/id/eprint/74666/1/Influence%20of%20Nb2O5.pdf |