Citation

Firman, Kartika and Raman, Velan and Lim, Teik Zheng Alvin and Khaw, Chwin Chieh and Matori, Khamirul Amin and Mohd Zaid, Mohd Hafiz and Ghotekar, Suresh and Murthy, Hanabe Chowdappa Ananda and Chan, Kah Yoong and Nagaswarupa, Hechanur Puttappa and Pang, Li Xia and Zhou, Di and Tan, Kar Ban (2026) Enhanced oxide ion conduction in W 6+ and V 5+ doped Bi 3 TaO 7 fluorites: a promising electrolyte for intermediate-temperature SOFCs. Journal of Asian Ceramic Societies. pp. 1-10. ISSN 2187-0764

Text Enhanced oxide ion conduction in W6+ and V5+ doped Bi3TaO7 fluorites_ a promising electrolyte for in.pdf - Published Version Restricted to Repository staff only Download (3MB)

Abstract

This study investigates the impact of W6+ and V5+ doping on optimizing the structural and ionic conductivity of bismuth tantalates. Phase-pure samples were successfully synthesized at 900°C and 24–48 hours. The increased polarizing power of W6+ and V5+ cations, relative to Ta5+, led to a weakening of Bi-O bonding and a subsequent expansion of the unit cell from 5.4477 (40) Å to 5.4668(1) Å upon chemical doping. No significant variation in grain size, which ranged from 0.20 to 3.41 µm, was observed among the samples and all samples demonstrated a density exceeding 85%. A thermally stable type II Bi2O3 phase was consistently observed across the studied temperature range of 50–1000°C. An enhancement in ionic conductivity was noted in all doped samples, with W-doped samples generally exhibiting better performance. The larger unit cell, stable type II Bi2O3 phase and interstitial oxygen were key contributors to the substantial improvement observed in the W-doped samples, particularly within the higher temperature range of 650 to 700°C. Bi3Ta0.8W0.2O7.10 demonstrated the highest conductivity value, reaching 0.0138 S cm−1 at 700°C, positioning it as a promising candidate for oxide ion conductor applications, such as ion-conducting solid electrolytes in solid oxide fuel cells (SOFCs).

Item Type:	Article
Uncontrolled Keywords:	Ionic
Subjects:	Q Science > QC Physics > QC501-766 Electricity and magnetism > QC501-(721) Electricity
Divisions:	Faculty of Artificial Intelligence & Engineering (FAIE)
Depositing User:	Ms Rosnani Abd Wahab
Date Deposited:	28 Oct 2026 07:39
Last Modified:	28 Oct 2026 07:39
URII:	http://shdl.mmu.edu.my/id/eprint/16949

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