Li Wenzhi, Zhu Yichao, He Zhiping
China Helicopter Research and Development Institute, Jingdezhen 333001, China.
Materials (Basel). 2025 May 29;18(11):2553. doi: 10.3390/ma18112553.
This study focuses on addressing the reflectivity reduction issue in LaSrTiO during high-temperature preparation, which is caused by oxygen vacancy generation. Bulk samples of CeO-doped LaSrTiO 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.%CeO 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 LaSrTiO. 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.
本研究聚焦于解决高温制备过程中LaSrTiO因氧空位产生而导致的反射率降低问题。制备了不同掺杂含量的CeO作为第二相且具有不同烧结温度的LaSrTiO块状样品。对其相组成、反射率和价态进行了深入研究。引入10 wt.%的CeO显著抑制了氧空位的形成。因此，减少了由氧空位引起的杂质能级的出现。这可以进一步减轻作为光子吸收陷阱的杂质能级所导致的反射率降低。此外，与纯LaSrTiO相比，在1450℃下获得的孔隙结构减少有助于提高反射率。研究结果表明，这种方法在高温条件下降低高反射陶瓷中氧空位敏感性并保持其光学性能方面具有巨大潜力。
