以La_2O_3和Ta_2O_5为原材料,采用固相反应法制备了La_2La Ta O_7粉体。用X射线衍射技术、扫描电子显微镜、EDS电子能谱分析了粉体的相结构,显微形貌和元素组成。用激光颗粒度仪和比表面积分析仪分析了粉体的颗粒度及表面积,用可见光照...以La_2O_3和Ta_2O_5为原材料,采用固相反应法制备了La_2La Ta O_7粉体。用X射线衍射技术、扫描电子显微镜、EDS电子能谱分析了粉体的相结构,显微形貌和元素组成。用激光颗粒度仪和比表面积分析仪分析了粉体的颗粒度及表面积,用可见光照射下亚甲基蓝的降解率分析了该粉体的光催化活性。结果表明,本文成功合成了纯净具有单一氟铝镁钠石结构的La_2La Ta O_7粉体,粉体具有明显的团聚现象,其平均颗粒度约为24μm,比表面积仅为0.463 m^2/g。经过150 min照射后,该粉体对亚甲基蓝的降解率达到68%,其较低的降解率可能与其较低的比表面积有关。展开更多
The vibrational spectrum of the CaAl2B2O7 was investigated. It was shown that the vibrations of the BO3 groups are present in the region of 1400600 cm-1, and the bands at 519 nm-1 may originate from the AlO6 vibration...The vibrational spectrum of the CaAl2B2O7 was investigated. It was shown that the vibrations of the BO3 groups are present in the region of 1400600 cm-1, and the bands at 519 nm-1 may originate from the AlO6 vibration. The luminescence properties of Eu3+ in CaAl2B2O7 were investigated. It was found that the Eu3+ ion in CaAl2B2O7 occupies two different sites. Investigation on the phonon sideband of Eu3+ indicates that BO3 groups are present in the surroundings of Eu3+ ions.展开更多
文摘以La_2O_3和Ta_2O_5为原材料,采用固相反应法制备了La_2La Ta O_7粉体。用X射线衍射技术、扫描电子显微镜、EDS电子能谱分析了粉体的相结构,显微形貌和元素组成。用激光颗粒度仪和比表面积分析仪分析了粉体的颗粒度及表面积,用可见光照射下亚甲基蓝的降解率分析了该粉体的光催化活性。结果表明,本文成功合成了纯净具有单一氟铝镁钠石结构的La_2La Ta O_7粉体,粉体具有明显的团聚现象,其平均颗粒度约为24μm,比表面积仅为0.463 m^2/g。经过150 min照射后,该粉体对亚甲基蓝的降解率达到68%,其较低的降解率可能与其较低的比表面积有关。
文摘The vibrational spectrum of the CaAl2B2O7 was investigated. It was shown that the vibrations of the BO3 groups are present in the region of 1400600 cm-1, and the bands at 519 nm-1 may originate from the AlO6 vibration. The luminescence properties of Eu3+ in CaAl2B2O7 were investigated. It was found that the Eu3+ ion in CaAl2B2O7 occupies two different sites. Investigation on the phonon sideband of Eu3+ indicates that BO3 groups are present in the surroundings of Eu3+ ions.
