In this study, Eu³⁺-containing amorphous silica nanoparticles and Eu compounds were successfully synthesized via a mechanochemical solid-state reaction between silica nanoparticles and EuCl₃·6H₂O. This reaction was induced by a grinding process, and the states of Eu³⁺ in the silica/europium composites were investigated. The silica/europium composites exhibited orange–red color luminescence owing to the ⁵D₀–⁷F₀, ⁵D₀–⁷F₁, and ⁵D₀–⁷F₂ transitions, which indicated the presence of Eu³⁺ in the silica framework and the newly formed Eu compounds such as EuOCl and Eu(OH)₂Cl. The mechanochemical reaction because of the grinding process effectively induced an interaction between the silica surface and europium chloride; subsequently, Eu(OH)₂Cl was formed in the silica/europium composites. Additionally, the Eu(OH)₂Cl in the silica/europium composite exhibited a higher thermal stability than that of simple Eu(OH)₂Cl, indicating that the mechanochemical reaction mediated the formation of Eu(OH)₂Cl and new chemical bonding between the newly formed Eu(OH)₂Cl and the silica surface, providing improved thermal stability to Eu(OH)₂Cl. Thus, we successfully prepared silica nanoparticles containing not only Eu(III) in the silica framework but also Eu compounds that exhibit unique chemical bonding during a mechanochemical reaction.

在这项研究中，通过二氧化硅纳米粒子与EuCl ₃ ·6H ₂ O的机械化学固相反应成功地合成了含Eu ³⁺的非晶态二氧化硅纳米粒子和Eu化合物。该反应是通过研磨过程和Eu的状态诱导的研究了二氧化硅/ eur复合物中的³⁺。二氧化硅/铕复合展出橙红色发光由于⁵ d ₀ - ⁷ ˚F ₀，⁵ d ₀ - ⁷ ˚F ₁，和⁵ d ₀ - ⁷ ˚F ₂过渡，表明在二氧化硅骨架中存在Eu ³⁺和新形成的Eu化合物，例如EuOCl和Eu（OH）₂ Cl。由于研磨过程的机械化学反应有效地诱导了二氧化硅表面与氯化euro之间的相互作用；随后，在二氧化硅/ eur复合物中形成了Eu（OH）₂ Cl。此外，欧盟（OH）₂氯在二氧化硅/铕复合表现出比简单的Eu（OH）的更高的热稳定性₂氯，表明机械化学反应介导的Eu的形成（OH）₂ Cl和新的化学键合在新形成的Eu（OH）_2之间Cl和二氧化硅表面，提高了Eu（OH）₂ Cl的热稳定性。因此，我们成功地制备了不仅在二氧化硅骨架中包含Eu（III），而且在机械化学反应过程中表现出独特化学键合的Eu化合物的二氧化硅纳米粒子。