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The doubly-doped bismuth vanadate with Al and Ti having formula unit, Bi2V1-xAlx/2Tix/2O5.5-δ (0.10 ≤ x ≤ 0.25) was synthesized. The specimens were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR), differential scanning calorimetric (DSC), UV-Vis, and electrochemical impedance spectroscopy (EIS) for their structural, thermal, optical, and electrical studies. Influence of both dopant cations (Al and Ti) was observed in the gradual stabilization of the tetragonal phase of Bi2VO5.5-δ with dopant amount. A non-uniform grain growth phenomenon was observed up to x = 0.175, with dopant addition. UV-Vis study revealed the comparatively higher order of oxide ion vacancies for the composition x = 0.175. Impedance spectroscopy measurements indicate a significant decrease of both the grain (Rg) and grain boundary resistances (Rgb) with the rise in temperature and the overall resistance is found to be dominated by the grain interior contribution. Enhancement of ionic conductivity was found in all the compositions in the intermediate temperature range as compared to the parent compound, and the single Al-doped system and the highest value were obtained for x = 0.175.


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Role of Al and Ti doping in modulating electrical properties of BIVOX system

Show Author's information Diptimayee TRIPATHYa( )Amarjyoti SAIKIAaGyati Tachang TADOaArvind PANDEYa,b
Department of Physics, North Eastern Regional Institute of Science and Technology, Nirjuli 791109, Arunachal Pradesh, India
Department of Applied Sciences and Humanities, National Institute of Foundry and Forge Technology, Hatia, Ranchi 834003, Jharkhand, India

Abstract

The doubly-doped bismuth vanadate with Al and Ti having formula unit, Bi2V1-xAlx/2Tix/2O5.5-δ (0.10 ≤ x ≤ 0.25) was synthesized. The specimens were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR), differential scanning calorimetric (DSC), UV-Vis, and electrochemical impedance spectroscopy (EIS) for their structural, thermal, optical, and electrical studies. Influence of both dopant cations (Al and Ti) was observed in the gradual stabilization of the tetragonal phase of Bi2VO5.5-δ with dopant amount. A non-uniform grain growth phenomenon was observed up to x = 0.175, with dopant addition. UV-Vis study revealed the comparatively higher order of oxide ion vacancies for the composition x = 0.175. Impedance spectroscopy measurements indicate a significant decrease of both the grain (Rg) and grain boundary resistances (Rgb) with the rise in temperature and the overall resistance is found to be dominated by the grain interior contribution. Enhancement of ionic conductivity was found in all the compositions in the intermediate temperature range as compared to the parent compound, and the single Al-doped system and the highest value were obtained for x = 0.175.

Keywords:

ionic conductivity, doping, phase transition, grain growth
Received: 25 January 2019 Revised: 12 March 2019 Accepted: 22 March 2019 Published: 04 December 2019 Issue date: December 2019
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Publication history
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Publication history

Received: 25 January 2019
Revised: 12 March 2019
Accepted: 22 March 2019
Published: 04 December 2019
Issue date: December 2019

Copyright

© The author(s) 2019

Acknowledgements

The authors are aptly thankful to Department of Science & Technology (DST), New Delhi for facilitating FIST facility in the Department of Physics (sanction order number SB/52/CMP-093/2013) for XRD and impedance studies. FT-IR facility extended by Tezpur University, SEM facility of CSIC, Dibrugarh University, and DSC facility of CIF, IIT Guwahati are gratefully acknowledged. Amarjyoti SAIKIA gratefully acknowledges DST, New Delhi for Innovation in Science Pursuit for Inspired Research (INSPIRE) fellowship (No. IF160767).

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