Novel monoclinic zirconolite in Bi2O3-CuO-Ta2O5 ternary system: phase equilibria, structural and electrical properties
Synthesis of novel monoclinic zirconolite, Bi1.92Cu0.08(Cu0.3Ta0.7)2O7.06 (β-BCT) using solid state reaction had been finalised at the firing temperature of 900 °C over 24 h. The X–ray diffraction pattern of β-BCT was fully indexed on a monoclinic symmetry, space group, C2/c with lattice constants,...
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| Format: | Article |
| Language: | English |
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Elsevier
2014
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| Online Access: | http://psasir.upm.edu.my/id/eprint/34674/1/Novel%20monoclinic%20zirconolite%20in%20Bi2O3-CuO-Ta2O5%20ternary%20system%20phase%20equilibri.pdf |
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| author | Tan, Kar Ban Chon, Mun Ping Khaw, Chwin Chieh Zainal, Zulkarnain Yap, Taufiq Yun Hin Tan, Phei Yi |
| author_facet | Tan, Kar Ban Chon, Mun Ping Khaw, Chwin Chieh Zainal, Zulkarnain Yap, Taufiq Yun Hin Tan, Phei Yi |
| author_sort | Tan, Kar Ban |
| collection | UPM |
| description | Synthesis of novel monoclinic zirconolite, Bi1.92Cu0.08(Cu0.3Ta0.7)2O7.06 (β-BCT) using solid state reaction had been finalised at the firing temperature of 900 °C over 24 h. The X–ray diffraction pattern of β-BCT was fully indexed on a monoclinic symmetry, space group, C2/c with lattice constants, a = 13.1052 (8), b = 7.6749 (5), c = 12.162 (6), α = γ = 90° and β = 101.32° (1), respectively. The reaction mechanism study indicated phase formation was greatly influenced by the reaction between intermediate bismuth tantalate binary phases and CuO at elevated temperatures. β-BCT was thermally stable up to a temperature of 900 °C and contained spherulite grains with sizes ranging from 1 to 14 μm. Electrical properties of this material were characterised over a broad temperature range covering temperatures from 10 K to 874 K. At the temperature of 304 K, two semicircles were discernible in complex Cole–Cole plot showing an insulating grain boundary with Cgb = 6.63 × 10−9 F cm−1 and a bulk response capacitance, Cb = 6.74 × 10−12 F cm−1. The Power law frequency-dependent ac conductivity of β-BCT was apparent in three frequency regimes; a low–frequency plateau regime, a high-frequency plateau regime and a dispersive regime taking place in the temperature range of 220–576 K. The frequency-dependent ac conductivity of β-BCT with increasing temperature was attributed to the thermal activated electrical conduction mechanism within the structure. |
| first_indexed | 2024-03-06T08:29:42Z |
| format | Article |
| id | upm.eprints-34674 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2024-03-06T08:29:42Z |
| publishDate | 2014 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | upm.eprints-346742016-11-24T05:26:36Z http://psasir.upm.edu.my/id/eprint/34674/ Novel monoclinic zirconolite in Bi2O3-CuO-Ta2O5 ternary system: phase equilibria, structural and electrical properties Tan, Kar Ban Chon, Mun Ping Khaw, Chwin Chieh Zainal, Zulkarnain Yap, Taufiq Yun Hin Tan, Phei Yi Synthesis of novel monoclinic zirconolite, Bi1.92Cu0.08(Cu0.3Ta0.7)2O7.06 (β-BCT) using solid state reaction had been finalised at the firing temperature of 900 °C over 24 h. The X–ray diffraction pattern of β-BCT was fully indexed on a monoclinic symmetry, space group, C2/c with lattice constants, a = 13.1052 (8), b = 7.6749 (5), c = 12.162 (6), α = γ = 90° and β = 101.32° (1), respectively. The reaction mechanism study indicated phase formation was greatly influenced by the reaction between intermediate bismuth tantalate binary phases and CuO at elevated temperatures. β-BCT was thermally stable up to a temperature of 900 °C and contained spherulite grains with sizes ranging from 1 to 14 μm. Electrical properties of this material were characterised over a broad temperature range covering temperatures from 10 K to 874 K. At the temperature of 304 K, two semicircles were discernible in complex Cole–Cole plot showing an insulating grain boundary with Cgb = 6.63 × 10−9 F cm−1 and a bulk response capacitance, Cb = 6.74 × 10−12 F cm−1. The Power law frequency-dependent ac conductivity of β-BCT was apparent in three frequency regimes; a low–frequency plateau regime, a high-frequency plateau regime and a dispersive regime taking place in the temperature range of 220–576 K. The frequency-dependent ac conductivity of β-BCT with increasing temperature was attributed to the thermal activated electrical conduction mechanism within the structure. Elsevier 2014-04-15 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/34674/1/Novel%20monoclinic%20zirconolite%20in%20Bi2O3-CuO-Ta2O5%20ternary%20system%20phase%20equilibri.pdf Tan, Kar Ban and Chon, Mun Ping and Khaw, Chwin Chieh and Zainal, Zulkarnain and Yap, Taufiq Yun Hin and Tan, Phei Yi (2014) Novel monoclinic zirconolite in Bi2O3-CuO-Ta2O5 ternary system: phase equilibria, structural and electrical properties. Journal of Alloys and Compounds, 592. pp. 140-149. ISSN 0925-8388; ESSN: 1873-4669 http://www.sciencedirect.com/science/article/pii/S0925838813029393 10.1016/j.jallcom.2013.11.197 |
| spellingShingle | Tan, Kar Ban Chon, Mun Ping Khaw, Chwin Chieh Zainal, Zulkarnain Yap, Taufiq Yun Hin Tan, Phei Yi Novel monoclinic zirconolite in Bi2O3-CuO-Ta2O5 ternary system: phase equilibria, structural and electrical properties |
| title | Novel monoclinic zirconolite in Bi2O3-CuO-Ta2O5 ternary system: phase equilibria, structural and electrical properties |
| title_full | Novel monoclinic zirconolite in Bi2O3-CuO-Ta2O5 ternary system: phase equilibria, structural and electrical properties |
| title_fullStr | Novel monoclinic zirconolite in Bi2O3-CuO-Ta2O5 ternary system: phase equilibria, structural and electrical properties |
| title_full_unstemmed | Novel monoclinic zirconolite in Bi2O3-CuO-Ta2O5 ternary system: phase equilibria, structural and electrical properties |
| title_short | Novel monoclinic zirconolite in Bi2O3-CuO-Ta2O5 ternary system: phase equilibria, structural and electrical properties |
| title_sort | novel monoclinic zirconolite in bi2o3 cuo ta2o5 ternary system phase equilibria structural and electrical properties |
| url | http://psasir.upm.edu.my/id/eprint/34674/1/Novel%20monoclinic%20zirconolite%20in%20Bi2O3-CuO-Ta2O5%20ternary%20system%20phase%20equilibri.pdf |
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