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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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Main Authors: Tan, Kar Ban, Chon, Mun Ping, Khaw, Chwin Chieh, Zainal, Zulkarnain, Yap, Taufiq Yun Hin, Tan, Phei Yi
Format: Article
Language:English
Published: Elsevier 2014
Online Access:http://psasir.upm.edu.my/id/eprint/34674/1/Novel%20monoclinic%20zirconolite%20in%20Bi2O3-CuO-Ta2O5%20ternary%20system%20phase%20equilibri.pdf
http://psasir.upm.edu.my/id/eprint/34674/
http://www.sciencedirect.com/science/article/pii/S0925838813029393
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spelling my.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
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
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.
format Article
author Tan, Kar Ban
Chon, Mun Ping
Khaw, Chwin Chieh
Zainal, Zulkarnain
Yap, Taufiq Yun Hin
Tan, Phei Yi
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
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
title 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_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_sort novel monoclinic zirconolite in bi2o3-cuo-ta2o5 ternary system: phase equilibria, structural and electrical properties
publisher Elsevier
publishDate 2014
url http://psasir.upm.edu.my/id/eprint/34674/1/Novel%20monoclinic%20zirconolite%20in%20Bi2O3-CuO-Ta2O5%20ternary%20system%20phase%20equilibri.pdf
http://psasir.upm.edu.my/id/eprint/34674/
http://www.sciencedirect.com/science/article/pii/S0925838813029393
_version_ 1643831224731435008
score 13.211869

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