Abstract
In the present study, glasses with composition XBi 2O 3 (60− X)P 2O 5 20Fe 3O 4 20Li 2O (0≤ X≤15) mol% have been prepared by the conventional melt quenching technique. The IR studies show the presence of FeO 4, FeO 6, BiO 6, PO 3, PO and PO 4 structural groups. The hyperfine structure of these glasses is investigated using Mössbauer spectroscopy. ME spectroscopy indicated the presence of two different oxidation states of iron (Fe 2+ and Fe 3+). The ferrous ions Fe 2+ occupied tetrahedral coordination states, while the ferric ions Fe 3+ occupied both tetrahedral and octahedral coordination states. The effect of partial replacement of P 2O 5 by Bi 2O 3 on the electric-dielectric properties is studied in more details. It is found that, unmonotonic variation in the σ dc, ( θ D /2), σ ac( ω), ε 1( ω), and ε 2( ω), as a function of Bi 2O 3 contents. Also it is found that, the power law exponent, s, is temperature dependent and the CBH model is the most applicable conduction mechanism in all glass samples. Pseudo Cole-Cole diagram of the investigated glassy samples exhibit similar behavior where all plots show a single semicircle indicating a single relaxation process.
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