Citation

Firman, K. and Feng, Y. and Alvin Lim, T. Z. and Raman, V. and Khaw, C. C. and Ghotekar, S. and Ananda Murthy, H. C. and Chan, Kah Yoong and Lu, M. and Sun, J. and Zhou, D. and Tan, K. B. (2025) Optimising the structural and ionic conductivity of bismuth tantalate fluorites through rare-earth element doping. Journal of the Indian Chemical Society, 102 (8). p. 101865. ISSN 0019-4522

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Abstract

Herein, we report a comprehensive study on the chemical modification of Bi3TaO7 fluorites through rare-earth element doping to enhance their structural and ionic conductivity. Selected dopants including La3+, Nd3+, Gd3+, Er3+ and Yb3+ were introduced to replace Ta5+ for the synthesis of novel solid solutions through solid-state reaction. Despite identical oxidation states and similar ionic radii, the solid solution formation was limited, with secondary phases observed. The lanthanide-doped Bi3TaO7 solid solutions exhibited improved ionic conductivity, particularly Bi3Ta0.8Nd0.2O6.8, which demonstrated the highest conductivity of 9.26 × 10−3 S cm−1 at 650 °C. Furthermore, this study highlights the role of oxygen vacancies and crystal defects in enhancing ionic conduction, providing further insights into the development of efficient oxide ionic conductors for applications in solid oxide fuel cells and sensor technologies.

Item Type:	Article
Uncontrolled Keywords:	Oxide
Subjects:	Q Science > QD Chemistry > QD450-801 Physical and theoretical chemistry
Divisions:	Faculty of Artificial Intelligence & Engineering (FAIE)
Depositing User:	Ms Rosnani Abd Wahab
Date Deposited:	29 Jul 2025 04:43
Last Modified:	01 Aug 2025 02:56
URII:	http://shdl.mmu.edu.my/id/eprint/14374

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