Threshold effect in the Mg-doping dependence of the photocatalytic ability of LiNbO₃ nanoparticles

详细信息    查看全文

• 作者：Xun Wang ; Wenbo Yan ; Yuwei Zhang ; Lixia Zhang ; Lihong Shi ; Yingying Huang ; Meng Wu ; Xuliang Wang and Hongjian Chen
• 刊名：Journal of the American Ceramic Society
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：100
• 期：2
• 页码：739-745
• 全文大小：979K
• ISSN：1551-2916

文摘

In this study, Mg-doped LiNbO₃ nanoparticles are prepared and their photocatalytic ability is studied for bioorganic degradation application. It is found that their photocatalytic ability shows a pronounced dependence on the Mg-doping levels, and in particular an unusual threshold effect exists at the 2-mol%-doping level. Moreover, X-ray diffraction (XRD), SEM, and differential scanning calorimetry (DSC) analyses show that the similar threshold effect also exists in the Mg-doping dependences of the crystalline anisotropy, morphology, and endothermic behavior of these LiNbO₃ nanoparticles. The relevance between the basic properties and the photocatalytic activity of the LiNbO₃ nanoparticles is discussed, and their Mg-doping dependences are finally connected with the (Nb_Li)⁴⁺ and (Mg_Nb)³⁻ defects in the lattice. It is suggested that both the morphology and the lattice defects of LiNbO₃ nanoparticles contribute to the photocatalytic activity and that trapping holes is the essential way through which the (Mg_Nb)³⁻ defects make the contribution.