Influence of mixed modifier fluoride on tuning the AC and dielectric properties of xBaF2–(50–x)CaF2–50B2O3 glass system

This study examined the effect of mixed alkaline earth modifier fluoride on AC conductivity and dielectric properties in xBaF2–(50–x)CaF2–50B2O3 (x = 5–35 mol) glass system. The impedance data showed a single-depressed semicircle with decreasing bulk resistance (Rb) with temperature. The change of σAC implied a non-linear relationship with BaF2, which induced a blocking effect on the mobility of the charge carriers at x ≤ 20 mol, indicating the Mixed Alkaline Earth Effect (MAEE). The abrupt increase at x = 25 mol was associated with the expansion of the glass network due to the formation of Non-Bridging Oxygen (NBO). All glass samples followed the Overlapping Large-Polaron Tunneling (OLPT) model for the conduction mechanism. The change in ε′ more prominent in low-frequency regions, signifying that polarization was contributed mainly by the space charge polarization. Electrical modulus analysis revealed non-Debye type relaxation, indicating temperature- and composition-dependent dynamic ion processes..

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