采用原位显微Raman光谱和18O同位素示踪技术,以325 nm激光为激发光源,对立方Nd2O3上过氧物种的光诱导生成过程进行了详细表征,进一步证实过氧源于分子氧对晶格氧的氧化反应.结果还表明,325 nm激光在室温下即可诱导过氧的生成,在实验条件下,生成的过氧物种可与Nd2O3的晶格氧发生快速的氧交换反应,位于Nd2O3体相的晶格氧也可迁移至样品表层进而参与过氧的生成.325 nm激光照射有助于促进晶格氧的迁移以及晶格氧与分子氧之间的氧交换反应.
Photo-induced formation of peroxide species on cubic Nd2O3 was studied by in situ microprobe Raman spectroscopy using 18O as a tracer and a 325-nm laser as an excitation source. The results confirmed that the peroxide ions were formed through photooxidation of the lattice oxygen species in neodymium sesquioxide by molecular oxygen species. Under UV excitation (λ = 325 nm), the reaction between O2 and O2-could take place at room temperature. A fast oxygen exchange between the peroxide ions and the lattice oxygen species in Nd2O3 took place under the experimental condi-tions studied. Also, bulk lattice oxygen species in Nd2O3 could migrate to the surface layer and par-ticipate in the formation of peroxide ions. The migration of lattice oxygen species and the oxygen exchange between lattice oxygen and peroxide ions were promoted by UV laser irradiation.
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