Bulg. J. Phys. vol.50 no.3 (2023), pp. 322-333

Factors Affecting Ionic Conductivity in La2-xBixMo1.95V0.05O9-δ (0.075 ≤ x ≤ 0:200): XRD and Raman Studies

Amar Jyoti Saikia1,2, Diptimayee Tripathy3, Arvind Pandey4
1Department of Physics, Dhemaji College, Dhemaji, Assam-787057, India
2North Eastern Regional Institute of Science & Technology, Arunachal Pradesh-791109, India
3Doon Inernational School, West Bengal-743422, India
4Department of Applied Science and Humanities, National Institute of Advanced Manufacturing Technology (formerly NIFFT), Jharkhand-834003, India
Abstract. The structural and Raman spectroscopic analyses of La2-xBixMo1.95V0.05O9-δ (0.075 ≤ x ≤ 0:200) are presented in this study. Reitveld refined XRD patterns indicate that the La-O1, La-O2, La-O3, and the average La-O bond length of lanthanum-oxygen polyhedral increases with Bismuth content. The average Mo-O bond length is found to be shortest for the composition x = 0.100, which correlates with the composition's highest conductivity and is also supported by the composition's shortest O2-O3 and O3-O bond distances. At x = 0.100, the La-La-La angle of the [O1LaMo] anti-tetrahedral unit is maximal, enabling greater O2 and O3 ion mobilities. From Raman study it is observed that Mo-O distance is minimal for the composition x = 0.100, which is also revealed by XRD outcome.

doi: https://doi.org/10.55318/bgjp.2023.50.3.322

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