Optimising the structural and ionic conductivity of bismuth tantalate fluorites through rare-earth element doping

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, K. Y. 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). art. no. 101865. pp. 1-9. ISSN 0019-4522

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.

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Additional Metadata

Item Type:	Article
Subject:	Drug Discovery
Subject:	Physical and Theoretical Chemistry
Subject:	Organic Chemistry
Divisions:	Faculty of Science Faculty of Humanities, Management and Science
DOI Number:	https://doi.org/10.1016/j.jics.2025.101865
Publisher:	Elsevier B.V.
Keywords:	Bismuth tantalate fluorites; Rare-earth element doping; Ionic conductivity; Structural optimization; Solid solutions; Lanthanide doping; Oxygen vacancies; Crystal defects; Solid oxide fuel cells; Sensor technologies
Sustainable Development Goals (SDGs):	SDG 9: Industry, Innovation and Infrastructure, SDG 7: Affordable and Clean Energy, SDG 12: Responsible Consumption and Production
Depositing User:	MS. HADIZAH NORDIN
Date Deposited:	18 Jun 2026 06:41
Last Modified:	18 Jun 2026 06:41
Altmetrics:	http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.jics.2025.101865
URI:	http://psasir.upm.edu.my/id/eprint/124285
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