研究目的
Investigating the relationship among the electrical conductivity, chemical durability, and structure of conductive vanadate glass in which Fe2+–Fe3+ and V4+–V5+ systems simultaneously coexist.
研究成果
The addition of Fe2O3 to vanadate glass improves electrical conductivity, chemical durability, and thermal properties by generating Fe2+–O–P or Fe3+–O–P bonds and replacing V O bonds with stronger Fe–O–V and P–O–V bonds. The structural reinforcement was confirmed through thermal and chemical properties analysis.
研究不足
The study focuses on a specific composition range of Fe2O3 (1 to 10 mol%) in the glass system. The effects of higher concentrations or other dopants were not explored. The study is limited to the analysis of electrical conductivity, chemical durability, and structural properties without exploring potential applications in detail.
1：Experimental Design and Method Selection:
Prepared samples of iron vanadium borophosphate glass with various compositions given by 78V2O5–15P2O5–7B2O3–xFe2O3 (1, 5,
2：5 and 10 mol%). Analyzed the electrical conductivity, chemical durability, FTIR spectra, thermal properties, density, and molar volume. Sample Selection and Data Sources:
Used extra pure grades of V2O5, B2O3, NH4H2PO4, and Fe2O3 as starting materials.
3：List of Experimental Equipment and Materials:
SDT Q600 for DSC measurements, Rigaku Co. Ultima 4 for XRD patterns, Spectrum GX for FTIR measurements, ESCALAB250 XPS system for XPS measurements, GH-200 for density measurements, HMS-3000 for Hall-effect measurement.
4：Experimental Procedures and Operational Workflow:
Mixed raw materials, melted in an electric furnace, quenched in air, annealed, heat treated, milled, sieved, and stored in vacuum.
5：Data Analysis Methods:
Used Gaussian-Lorentzian peaks fitted by the least-squares method for XPS data analysis.
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