Subsolidus phase equilibria and electrical properties of pyrochlores in the Bi2O3–CuO–Ta2O5 ternary system
Subsolidus phase relations had been determined for the Bi2O3–CuO–Ta2O5 (BCT) system over the temperature range 700–950 °C in air. Two structurally distinct ternary phases of different symmetries, a cubic pyrochlore and a monoclinic zirconolite were observed. Phase-pure pyrochlores existed in a uniqu...
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| Format: | Article |
| Language: | English |
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Elsevier
2016
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| Online Access: | http://psasir.upm.edu.my/id/eprint/53931/1/Subsolidus%20phase%20equilibria%20and%20electrical%20properties%20of%20pyrochlores%20.pdf |
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| author | Chon, M. P. Tan, Kar Ban Khaw, Chwin Chieh Zainal, Zulkarnain Yap, Taufiq Yun Hin Chen, Soo Kien Tan, P. Y. |
| author_facet | Chon, M. P. Tan, Kar Ban Khaw, Chwin Chieh Zainal, Zulkarnain Yap, Taufiq Yun Hin Chen, Soo Kien Tan, P. Y. |
| author_sort | Chon, M. P. |
| collection | UPM |
| description | Subsolidus phase relations had been determined for the Bi2O3–CuO–Ta2O5 (BCT) system over the temperature range 700–950 °C in air. Two structurally distinct ternary phases of different symmetries, a cubic pyrochlore and a monoclinic zirconolite were observed. Phase-pure pyrochlores existed in a unique boomerang-shaped area, which could be described using the general formula, Bi2.48+yCu1.92−xTa3.6+x−yO14.64+3x/2−y: 0.00(1) ≤ x ≤ 0.80(1) and 0.00 (1) ≤ y ≤ 0.60(1), respectively. BCT subsolidus pyrochlores exhibited low electrical conductivities, 10−7–10−6 S cm−1, moderate dielectric constants, ε′, ∼60–80 and low dielectric losses, tan δ, ∼0.01–0.20 at 1 MHz and ambient temperature, ∼28 °C. The recorded low activation energies, 0.32–0.40 eV suggesting these electroceramics were of semiconductor-type at elevated temperatures. |
| first_indexed | 2024-03-06T09:19:15Z |
| format | Article |
| id | upm.eprints-53931 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2024-03-06T09:19:15Z |
| publishDate | 2016 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | upm.eprints-539312018-02-21T09:02:37Z http://psasir.upm.edu.my/id/eprint/53931/ Subsolidus phase equilibria and electrical properties of pyrochlores in the Bi2O3–CuO–Ta2O5 ternary system Chon, M. P. Tan, Kar Ban Khaw, Chwin Chieh Zainal, Zulkarnain Yap, Taufiq Yun Hin Chen, Soo Kien Tan, P. Y. Subsolidus phase relations had been determined for the Bi2O3–CuO–Ta2O5 (BCT) system over the temperature range 700–950 °C in air. Two structurally distinct ternary phases of different symmetries, a cubic pyrochlore and a monoclinic zirconolite were observed. Phase-pure pyrochlores existed in a unique boomerang-shaped area, which could be described using the general formula, Bi2.48+yCu1.92−xTa3.6+x−yO14.64+3x/2−y: 0.00(1) ≤ x ≤ 0.80(1) and 0.00 (1) ≤ y ≤ 0.60(1), respectively. BCT subsolidus pyrochlores exhibited low electrical conductivities, 10−7–10−6 S cm−1, moderate dielectric constants, ε′, ∼60–80 and low dielectric losses, tan δ, ∼0.01–0.20 at 1 MHz and ambient temperature, ∼28 °C. The recorded low activation energies, 0.32–0.40 eV suggesting these electroceramics were of semiconductor-type at elevated temperatures. Elsevier 2016-08 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/53931/1/Subsolidus%20phase%20equilibria%20and%20electrical%20properties%20of%20pyrochlores%20.pdf Chon, M. P. and Tan, Kar Ban and Khaw, Chwin Chieh and Zainal, Zulkarnain and Yap, Taufiq Yun Hin and Chen, Soo Kien and Tan, P. Y. (2016) Subsolidus phase equilibria and electrical properties of pyrochlores in the Bi2O3–CuO–Ta2O5 ternary system. Journal of Alloys and Compounds, 675. pp. 116-127. ISSN 0925-8388; ESSN: 1873-4669 https://www.sciencedirect.com/science/article/pii/S0925838816306582 Ternary phase diagram; X-ray methods; Electrical conductivity; Tantalates 10.1016/j.jallcom.2016.03.089 |
| spellingShingle | Ternary phase diagram; X-ray methods; Electrical conductivity; Tantalates Chon, M. P. Tan, Kar Ban Khaw, Chwin Chieh Zainal, Zulkarnain Yap, Taufiq Yun Hin Chen, Soo Kien Tan, P. Y. Subsolidus phase equilibria and electrical properties of pyrochlores in the Bi2O3–CuO–Ta2O5 ternary system |
| title | Subsolidus phase equilibria and electrical properties of pyrochlores in the Bi2O3–CuO–Ta2O5 ternary system |
| title_full | Subsolidus phase equilibria and electrical properties of pyrochlores in the Bi2O3–CuO–Ta2O5 ternary system |
| title_fullStr | Subsolidus phase equilibria and electrical properties of pyrochlores in the Bi2O3–CuO–Ta2O5 ternary system |
| title_full_unstemmed | Subsolidus phase equilibria and electrical properties of pyrochlores in the Bi2O3–CuO–Ta2O5 ternary system |
| title_short | Subsolidus phase equilibria and electrical properties of pyrochlores in the Bi2O3–CuO–Ta2O5 ternary system |
| title_sort | subsolidus phase equilibria and electrical properties of pyrochlores in the bi2o3 cuo ta2o5 ternary system |
| topic | Ternary phase diagram; X-ray methods; Electrical conductivity; Tantalates |
| url | http://psasir.upm.edu.my/id/eprint/53931/1/Subsolidus%20phase%20equilibria%20and%20electrical%20properties%20of%20pyrochlores%20.pdf |
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