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Updated: May 31, 2026
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Published on: October 9, 2012
Raman scattering study of β-Sr(0.33)V(2)O(5) in charge disordered and ordered phase
Z V Popović1, A G Kontos, Y S Raptis
1Center for Solid State Physics and New Materials, Institute of Physics, Pregrevica 118, 11080 Belgrade, Serbia.
Summary
Raman spectroscopy reveals a charge ordering transition in strontium vanadium oxide bronze at 165 K, marked by new spectral modes. This behavior resembles other vanadium oxides, suggesting similar charge-phonon dynamics and electron delocalization.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid State Chemistry
Background:
- Strontium vanadium oxide bronze (β-Sr(0.33)V(2)O(5)) exhibits complex electronic properties.
- Understanding charge ordering phenomena is crucial for developing novel electronic materials.
Purpose of the Study:
- To investigate the charge ordering phase transition in β-Sr(0.33)V(2)O(5) using polarized Raman spectroscopy.
- To compare the charge-phonon dynamics with related vanadium oxide compounds.
Main Methods:
- Polarized Raman spectroscopy measurements were performed on β-Sr(0.33)V(2)O(5) between 300 K and 77 K.
- Analysis of spectral changes, including new mode appearance, frequency shifts, and damping variations, across the phase transition.
Main Results:
- A charge ordering phase transition was identified at approximately 165 K.
- The transition is characterized by the emergence of new Raman-active modes and abrupt changes in phonon frequencies and dampings.
- Raman spectra in the disordered phase show similarities to α'-NaV(2)O(5), indicating analogous charge-phonon coupling.
Conclusions:
- The study confirms a charge ordering transition in β-Sr(0.33)V(2)O(5) via Raman spectroscopy.
- Similarities in spectral features suggest comparable charge-phonon dynamics in β-Sr(0.33)V(2)O(5) and α'-NaV(2)O(5).
- Electrons are proposed to delocalize within V(1)-O(5)-V(3) orbitals in the mixed-valence state.
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