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Microstructure profiling, lattice dynamics, and morphological studies on multi-excitonic vanadium bismuth oxide compound systems

Microstructure profiling, lattice dynamics, and morphological studies on multi-excitonic vanadium... The solubility limit of bismuth in orthorhombic structured vanadium pentoxide is determined in V2-xBi2xO5-δ compound systems. Highly polycrystalline single-phased solid solutions of V2-xBi2xO5-δ were synthesized for mole fractions “x” varying from 0.01 to 0.04 and at x = 0.05, the compound contorts into an impure phase. Orthorhombic structured compounds with crystallite sizes varied from 54.80 to 70.23 nm are observed from powder X-ray diffraction analysis and supplementary structural information was obtained by recording micro-Raman spectra. Out of the 21 Raman active phonon modes of the α-polymorphic form of V2O5, 10 well-resolved peaks were identified for all “x” values. The dense growths of microstructured constituents were obtained, viz. scanning electron micrographs. The slight increase of optical bandgap from 2.22 to 2.27 eV with the increase in mole fraction is an indication of the replacement of high valency vanadyl cations with Bi3+ ions. Intense and broad near-band edge photoluminescent emissions detected are due to the various electronic transitions. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of the Australian Ceramic Society Springer Journals

Microstructure profiling, lattice dynamics, and morphological studies on multi-excitonic vanadium bismuth oxide compound systems

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References (37)

Publisher
Springer Journals
Copyright
Copyright © The Author(s) under exclusive licence to Australian Ceramic Society 2022
ISSN
2510-1560
eISSN
2510-1579
DOI
10.1007/s41779-022-00766-7
Publisher site
See Article on Publisher Site

Abstract

The solubility limit of bismuth in orthorhombic structured vanadium pentoxide is determined in V2-xBi2xO5-δ compound systems. Highly polycrystalline single-phased solid solutions of V2-xBi2xO5-δ were synthesized for mole fractions “x” varying from 0.01 to 0.04 and at x = 0.05, the compound contorts into an impure phase. Orthorhombic structured compounds with crystallite sizes varied from 54.80 to 70.23 nm are observed from powder X-ray diffraction analysis and supplementary structural information was obtained by recording micro-Raman spectra. Out of the 21 Raman active phonon modes of the α-polymorphic form of V2O5, 10 well-resolved peaks were identified for all “x” values. The dense growths of microstructured constituents were obtained, viz. scanning electron micrographs. The slight increase of optical bandgap from 2.22 to 2.27 eV with the increase in mole fraction is an indication of the replacement of high valency vanadyl cations with Bi3+ ions. Intense and broad near-band edge photoluminescent emissions detected are due to the various electronic transitions.

Journal

Journal of the Australian Ceramic SocietySpringer Journals

Published: Sep 1, 2022

Keywords: Transition metal oxides; Multi-cation oxides; Photoluminescence; V2O5; Micro-Raman

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