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The mixed-alkali effect (MAE) has been investigated in the glass system (40 − x)Li2O–xNa2O–10K2O–50B2O3 (0 mol% ≤ x ≤ 40 mol%) through density, modulated differential scanning calorimetry (DSC), and optical absorption studies. From the absorption studies, the values of the optical band gap (Eopt) for direct transition and Urbach energy (ΔE) have been evaluated. The values of Eopt and ΔE show nonlinear...
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