Abstract
The electrical conductivity and dielectric properties of xB2O3–(40−x)Fe2O3–60P2O5 (x=6–20, mol%) glasses were investigated in the frequency range from 0.01Hz to 1MHz and the temperature range from 303K to 523K. At temperatures below 523K an ac conductivity and the dielectric constant follow the universal dielectric response (UDR), being typical for hopping or tunneling of localized charge carriers. A detailed analysis of the temperature dependence of the UDR parameter s in terms of the theoretical model for tunneling of small polarons revealed that below 523K this mechanism governs the charge transport in these glasses. The comparison of the values of characteristic coefficients W∞ and α determined by two different methods confirms the polaronic behavior of boron doped iron phosphate glasses.
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