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UPSI Digital Repository (UDRep)
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| Abstract : Universiti Pendidikan Sultan Idris |
| This study examined the effect of mixed alkaline earth modifier fluoride on AC conductivity and dielectric properties in xBaF2(50x)CaF250B2O3 (x = 535mol%) glass system. The impedance data showed a single-depressed semicircle with decreasing bulk resistance (Rb) with temperature. The change of ?AC implied a non-linear relationship with BaF2, which induced a blocking effect on the mobility of the charge carriers at x ? 20mol%, indicating the Mixed Alkaline Earth Effect (MAEE). The abrupt increase at x = 25mol% 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 ?? 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. 2023, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature. |
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