New positive mixed alkali effect in V2O5.nH2O nanocrystalline films

A. S. Abdel Moghny (), Samia E. Attia Negm, Sh. Heikal and A. A. Bahgat
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A. S. Abdel Moghny: Al-Azhar University
Samia E. Attia Negm: Al-Azhar University
Sh. Heikal: Al-Azhar University
A. A. Bahgat: Al-Azhar University

The European Physical Journal B: Condensed Matter and Complex Systems, 2025, vol. 98, issue 4, 1-10

Abstract: Abstract V2O5·nH2O nanocrystalline films intercalated with Li+ and Na+ ions were prepared using the sol–gel technique. The compositions of LixNa1-xV2O5·nH2O were varied with 0 ≤ x ≤ 1 mol% to investigate the mixed alkali effect on structural properties, such as density and X-ray diffraction (XRD), as well as DC electrical conductivity and thermoelectric power. XRD analysis revealed that the LixNa1-xV2O5·nH2O films consist of highly oriented nanocrystals. Structural analysis showed that the intercalation of alkali ions did not significantly alter the structure, while the crystallite size and interlayer spacing exhibited a nonlinear dependence on Li content. Density calculations revealed a linear dependence on composition. The variation of DC conductivity showed a maximum conductivity (σdc) and minimum activation energy (Wdc) at x = 0.5 mol%, which can be attributed to the mixed alkali effect resulting from the mixing of two alkali oxides. The thermoelectric power (S) and power factor (PF) exhibited nonlinear behavior due to the mixed alkali effect. Graphical Abstract

Date: 2025
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DOI: 10.1140/epjb/s10051-025-00907-4

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