New positive mixed alkali effect in V2O5.nH2O nanocrystalline films

IF 1.6 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

The European Physical Journal B Pub Date : 2025-04-17 DOI:10.1140/epjb/s10051-025-00907-4

A. S. Abdel Moghny, Samia E. Attia Negm, Sh. Heikal, A. A. Bahgat

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Abstract

V₂O₅·nH₂O nanocrystalline films intercalated with Li⁺ and Na⁺ ions were prepared using the sol–gel technique. The compositions of Li_xNa_1-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 Li_xNa_1-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 (σ_dc) and minimum activation energy (W_dc) 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.

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V2O5中新的正混合碱效应。nH2O纳米晶膜

采用溶胶-凝胶法制备了插Li+和Na+离子的V2O5·nH2O纳米晶膜。在0≤x≤1 mol%范围内改变LixNa1-xV2O5·nH2O的组成，考察混合碱对结构性能的影响，如密度、x射线衍射（XRD）、直流电导率和热电功率。XRD分析表明，LixNa1-xV2O5·nH2O薄膜由高取向纳米晶体组成。结构分析表明，碱离子的插入对结构没有显著影响，而晶体尺寸和层间间距与锂含量呈非线性关系。密度计算表明，密度与成分呈线性关系。直流电导率在x = 0.5 mol%时出现最大电导率（σdc）和最小活化能（Wdc），这可能是由于两种碱氧化物混合产生的混合碱效应所致。在混合碱的作用下，热电功率(S)和功率因数（PF）表现出非线性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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