Synthesis and Characterization of Vanadium Doped Hexagonal Rubidium Tungsten Bronze

Authors

  • Hasina Akhter Simol Department of Chemistry, University of Dhaka, Dhaka-1000, Bangladesh
  • Istiak Hossain Department of Chemistry, University of Dhaka, Dhaka-1000, Bangladesh
  • Tapas Debnath Department of Theoretical and Computational Chemistry, University of Dhaka
  • Pradip K Bakshi Department of Chemistry, University of Dhaka, Dhaka-1000, Bangladesh
  • Rumana Akther Jahan Centre for Advance Research in Sciences, University of Dhaka, Bangladesh
  • Claus H Ruscher Institute of Mineralogy, Leibniz University of Hannover, Callinstraße 3, 30167 Hannover
  • Altaf Hussain Bangabandhu Sheikh Mujibur Rahman Maritime University, Dhaka, Bangladesh

DOI:

https://doi.org/10.3329/dujs.v72i1.71194

Keywords:

Hexagonal tungsten bronze, Tungsten oxide, Vanadium oxide, Rubidium oxide

Abstract

Attempts have been made to synthesize vanadium doped rubidium hexagonal tungsten bronzes with the nominal composition RbxVyW1-yO3 (x = 0.30, 0.25, and 0.0 ≤ y ≤ x). The samples were synthesized using the solid state synthesis method in a silica glass tube under vacuum at (10-2 Torr) 700°C. The X-ray diffraction measurements reveal that a pure hexagonal tungsten bronze (HTB) phase can be formed with a 60% replacement of W5+ by V5+. The systematic incorporation of vanadium into the HTB lattice, as well as the reduction of V/W-O bond lengths in the xy plane and the lengthening of these bonds in the crystallographic c direction, are also revealed by Rietveld structure refinement of XRD data. The XRD results are supported by FTIR absorption spectra of the oxidized phases. Furthermore, an absorption signature develops as a function of y and exhibits a considerable increase in intensity with the eventual replacement of W5+ by V5+, showing a large decrease in the metallic like contribution and revealing the compounds' nonmetallic nature. Elemental analysis indicates good agreement with nominal values, demonstrating that vanadium was systematically incorporated into the RbxVyW1-yO3 system.

Dhaka Univ. J. Sci. 72(1): 77-84, 2024 (January)

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Published

2024-03-25

How to Cite

Simol, H. A., Hossain, I., Debnath, T., Bakshi, P. K., Jahan, R. A., Ruscher, C. H., & Hussain, A. (2024). Synthesis and Characterization of Vanadium Doped Hexagonal Rubidium Tungsten Bronze. Dhaka University Journal of Science, 72(1), 77–84. https://doi.org/10.3329/dujs.v72i1.71194

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