研究目的
Investigating the effect of gamma-ray irradiation on the electric and optical properties of SrTiO3 single crystals, focusing on the development of visible emission and the formation of oxygen vacancies.
研究成果
The STO single crystal exhibits a good tolerance against damage by γ-ray irradiation, with newly generated oxygen vacancies not significantly harming its electric and optical properties. The visible emission near 550 nm increases with γ-ray dose, indicating an increase in oxygen vacancies, but without detrimental effects on the material's properties.
研究不足
The study focused on the effects of γ-ray irradiation up to 900 kGy on STO single crystals. The analysis was limited to visible emission, electric, and optical absorption properties. The mechanism behind the red-shift of the PL peak with γ-ray irradiation was not fully explained, indicating a need for further theoretical work.
1：Experimental Design and Method Selection:
The study involved irradiating SrTiO3 single crystals with γ-ray from a 60Co source at various total doses up to 900 kGy and analyzing their photoluminescence (PL), electric, and optical absorption properties.
2：Sample Selection and Data Sources:
STO single crystals in the (100) crystalline orientations were used.
3：List of Experimental Equipment and Materials:
He-Cd Laser (λ = 325 nm) for PL measurements, ultraviolet-visible-nearinfrared spectrophotometer (V-670, JASCO) for reflectivity and transmission spectra.
4：Experimental Procedures and Operational Workflow:
PL spectra were measured with temperature dependence from 10 K to 300 K. Electric properties were measured via frequency-dependent dielectric constant and loss.
5：Data Analysis Methods:
The absorption coefficient spectra were calculated from reflectivity and transmission spectra to analyze electronic structure.
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