Influence of Oxygen-Release Material Doping on the Optical Properties of La_1-xSr_xTiO_3+δ

This study focuses on addressing the reflectivity reduction issue in La_1-xSr_xTiO_3+δ during high-temperature preparation, which is caused by oxygen vacancy generation. Bulk samples of CeO₂-doped La_1-xSr_xTiO_3+δ with varying doping contents as a second phase and sintering temperatures were prepared. The phase composition, reflectivity, and valence states were thoroughly investigated. Introducing 10 wt.%CeO₂ significantly suppressed the formation of oxygen vacancies. Thus, the occurrence of impurity levels caused by oxygen vacancies was reduced. This can further mitigate the reflection decrease caused by impurity levels as photon absorption traps. Additionally, the reduced pore structure achieved at 1450 °C contributed to improved reflectivity compared to pure La_1-xSr_xTiO_3+δ. The findings suggest that this approach has great potential for reducing oxygen vacancies sensitivity in high-reflection ceramics under high-temperature conditions and preserving their optical properties.