Threshold effect in the Mg-doping dependence of the photocatalytic ability of LiNbO<sub>3sub> nanoparticles
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- 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 LiNbO<sub>3sub> 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 LiNbO<sub>3sub> nanoparticles. The relevance between the basic properties and the photocatalytic activity of the LiNbO<sub>3sub> nanoparticles is discussed, and their Mg-doping dependences are finally connected with the (Nb<sub>Lisub>)<sup>4+sup> and (Mg<sub>Nbsub>)<sup>3−sup> defects in the lattice. It is suggested that both the morphology and the lattice defects of LiNbO<sub>3sub> nanoparticles contribute to the photocatalytic activity and that trapping holes is the essential way through which the (Mg<sub>Nbsub>)<sup>3−sup> defects make the contribution.