研究目的
To study the effect of irradiation with Fe7+ ions on the structural properties, morphology, and strength properties of thin TiO2 foils, specifically focusing on defect formation, crystallinity changes, and radiation resistance.
研究成果
Irradiation with Fe7+ ions leads to significant structural changes in TiO2 foils, including decreased crystallinity, increased lattice parameters, and reduced microhardness at high fluences. This is due to defect formation and migration, resulting in hillock formation and surface degradation. The findings highlight the reduced radiation resistance of brookite-phase TiO2 foils under heavy ion irradiation, with implications for their use in protective coatings in nuclear applications.
研究不足
The study is limited to specific irradiation conditions (Fe7+ ions at 85 MeV) and fluence range; results may not generalize to other ions or energies. The foil thickness and substrate material could influence outcomes. The simulation of neutron radiation effects using heavy ions might not fully replicate actual reactor conditions.
1：Experimental Design and Method Selection:
The study involved irradiating thin TiO2 foils with Fe7+ ions to simulate neutron radiation effects and assess structural changes. Methods included magnetron sputtering for foil preparation, irradiation at a heavy ion accelerator, and various characterization techniques (XRD, microhardness testing, AFM, SEM/EDS).
2：Sample Selection and Data Sources:
Thin TiO2 foils (620 nm thick) were prepared using magnetron sputtering on steel substrates. Samples were irradiated with fluences from 1×1011 to 1×1014 ions/cm
3：List of Experimental Equipment and Materials:
Equipment included Edwards Auto 500 magnetron sputtering system, DC-60 heavy ion accelerator, LM-700 microhardness meter, D8 ADVANCE ECO X-ray diffractometer, STM SmartSPM atomic force microscope, Hitachi TM3030 scanning electron microscope with Bruker XFlash MIN SVE microanalysis system. Materials included titanium oxide target (K. Lesker), argon and oxygen gases, steel substrate (12X18H10T).
4：Experimental Procedures and Operational Workflow:
Foils were deposited via magnetron sputtering (240 W power, 6×10^-3 mbar pressure, 2 minutes per layer). Irradiation was performed with Fe7+ ions at 85 MeV. Post-irradiation, samples were analyzed for microhardness (100 N load), XRD (CuKα radiation, 20 kV, 5 mA, 2θ=10-80°), AFM (AC-Mode, 10x10 μm scan size), and SEM/EDS (15 kV accelerating voltage).
5：Data Analysis Methods:
Data were analyzed using formulas for density calculation, texturing degree, Williamson-Hall method for crystallite size and deformation, and microhardness calculation. Statistical analysis included error estimates for measurements.
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