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Interplay of cationic substitution, band gap narrowing, and polaronic transport in LiFexCr1-xP2O7 solid solutions
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DOI：10.1016/j.jssc.2026.126184.png)
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Abstract
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• Successful synthesis of LiFexCr1-xP2O7 (0.2 ≤ x ≤ 0.8) solid solutions with preserved monoclinic structure. • Cationic substitution induces lattice strain and defect states, confirmed by XRD and optical analysis. • Systematic band gap narrowing and increased Urbach energy with increasing Fe content. • Enhanced electrical conductivity and reduced activation energy driven by Fe-induced structural disorder. • Strong correlation established between composition, structure, and polaronic transport properties.
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