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Polarons in boron doped iron phosphate glasses
Authors:C Filipič  A Moguš-Milanković  L Pavić  M Karabulut  A Levstik
Institution:1. Jo?ef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia;2. Rudjer Bo?kovi? Institute, 10000 Zagreb, Croatia;3. Kafkas University, 36100 Kars, Turkey
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 0.01 Hz to 1 MHz and the temperature range from 303 K to 523 K. At temperatures below 523 K 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 523 K 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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