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Infrared reflectivity spectra of η-Na1.3V2O5 in the charge disordered and ordered phase

Popovic, Z V
•
Djokic, D M
•
Dohcevic-Mitrovic, Z
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2008
The European Physical Journal B

We have measured the far-infrared reflectivity spectra of the sodium vanadium oxide η-Na1.3V2O5 polycrystals in the wide temperature (80–300 K) and frequency (150–1500 cm−1) range. Appearance of new phonon oscillators, phonon oscillator mode splitting and step-like shift of TO and LO frequencies at low temperatures are correlated with the charge-ordering phase transition, which takes place at about 120 K in this vanadium oxide.

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