Study of Tungsten Phosphate Glasses Containing Fe2O3
Open Access
- 1 January 2019
- journal article
- research article
- Published by Scientific Research Publishing, Inc. in New Journal of Glass and Ceramics
- Vol. 09 (03), 33-49
- https://doi.org/10.4236/njgc.2019.93004
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 βKeywords
This publication has 28 references indexed in Scilit:
- Influence of iron ions on the structural and magnetic properties of some zinc-phosphate glassesMaterials Chemistry and Physics, 2010
- A glass-encapsulated calcium phosphate wasteform for the immobilization of actinide-, fluoride-, and chloride-containing radioactive wastes from the pyrochemical reprocessing of plutonium metalJournal of Nuclear Materials, 2007
- Microstructures of BaTiO3 based PTC thermistors with Ca, Sr and Pb additionsJournal of the European Ceramic Society, 2005
- Transport properties of Li2O–MnO2–B2O3 glassesSolid State Ionics, 2005
- Impedance spectroscopic and dielectric analysis of PMMA-CO-P4VPNO polymer filmsMaterials Letters, 2004
- Chemically durable iron phosphate glasses for vitrifying sodium bearing waste (SBW) using conventional and cold crucible induction melting (CCIM) techniquesJournal of Nuclear Materials, 2003
- Electronic and ionic conductivity of glasses inside the Li2O–MoO3–P2O5 systemSolid State Ionics, 2000
- Structural Role of PbO in Li2O–PbO–B2O3 GlassesJournal of Solid State Chemistry, 1999
- Structural properties of lead-iron phosphate glassesJournal of Non-Crystalline Solids, 1985
- Lead-Iron Phosphate Glass: A Stable Storage Medium for High-Level Nuclear WasteScience, 1984