Study of Tungsten Phosphate Glasses Containing Fe₂O₃

DOI: 10.4236/njgc.2019.93004, PP. 33-49

Keywords: Phosphate, Glasses, Thermal Analysis, Structure, Electrical Conductivity

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Abstract:

Glasses of the compositions 20Li₂O-(50 - x)Li₂WO₄-xFe₂O₃-30P₂O₅ where (x = 0, 1, 5, 8, 10, 15 mol%) were elaborated by the melt-quenching route. Synthesized glasses are characterized using X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), differential scanning calorimetric？(DSC), and density determination. The XRD patterns confirmed the？amorphous nature of samples, and IR spectra showed the structural groups and highlight the depolymerization of phosphate network with the introduction of iron oxide. It is found that the structural unit Q² converts to Q¹ and Q⁰ as Fe₂O₃ replaces Li₂WO₄. Chemical durability tests on the glasses have shown that the compositions containing pyrophosphate (Q¹) and orthophosphate (Q⁰) units are more water-resist. The electrical conductivity measurements were performed by complex impedance spectroscopy in the frequency range of 20 - 10⁶ Hz at various temperatures from ambient to 400°C. It is found that the conductivity is activated thermally and follows an Arrhenius law. The obtained electrical data were analyzed by the modulus formalism and dielectric formalism. The determined asymmetric nature of？ spectra suggested that the relaxation behavior is non-Debye and characterized by the stretched exponent parameter β < 1.

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