研究目的
To study the structure-property relations in (35-x)B2O3-65Bi2O3-x Fe2O3 glass system by means of XRD patterns, EPR and electronic spectra, focusing on the local structure and symmetry around trivalent iron ions.
研究成果
The EPR spectra show lines at g=4.2 and g=2.0, indicating trivalent iron in distorted octahedral environments with rhombic distortion and cluster formation at higher Fe2O3 concentrations. Electronic spectra confirm d-d transitions in the same environment. The symmetry around iron is composition-independent, but intensity changes with Fe2O3 content, suggesting structural insights for glass applications.
研究不足
The study is limited to a specific composition range (0.1≤ x ≤ 0.4) and does not explore other transition metal oxides or different synthesis methods. The EPR and electronic spectra interpretations rely on established theories, which may not capture all nuances of the glass structure.
1：Experimental Design and Method Selection:
The sol-gel technique was employed to synthesize glass samples with varying Fe2O3 content. EPR and electronic spectroscopy were used to analyze the local structure and symmetry of trivalent iron ions.
2：Sample Selection and Data Sources:
Four glass samples (A1-A4) with compositions (35-x)B2O3-65Bi2O3-x Fe2O3 (x = 0.1, 0.2, 0.3, 0.4) were prepared using reagent grade chemicals.
3：1, 2, 3, 4) were prepared using reagent grade chemicals.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Reagent grade iron(III) nitrate, bismuth(III) nitrate, boric acid, citric acid, silica crucibles, electrically heated furnace, ice cold aluminium plates, Seifert diffractometer (model XRD 3000) with CuKα radiation, JEOL JES TE100 EPR spectrometer, Varian Cary 5000 UV-visible NIR spectrophotometer.
4：Experimental Procedures and Operational Workflow:
Solutions of precursors were mixed with citric acid, heated to form gel, dried, melted at 1313-1374 K, quenched on aluminium plates, and powdered for analysis. XRD, EPR, and electronic spectra were recorded at room temperature.
5：Data Analysis Methods:
XRD patterns confirmed amorphous nature. EPR spectra were analyzed for g-values and line intensities. Electronic spectra were interpreted for d-d transitions using energy level diagrams.
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