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Microstructure effects on the local order and electronic defects in (Al, Ti, Mg) co-doped ZnO conductive ceramics
Journal of the European Ceramic Society ( IF 5.7 ) Pub Date : 2020-06-12 , DOI: 10.1016/j.jeurceramsoc.2020.06.033
Qianying Sun , Guorong Li , Zhenyong Man , Liaoying Zheng , Małgorzata Makowska-Janusik , Maud Barré , Jens Dittmer , Sandy Auguste , Anthony Rousseau , Abdel Hadi Kassiba

Fine particles with different sizes of (Al, Ti, Mg) oxide co-doped ZnO ceramics were realized by a suitable grinding and a mechanical ball milling, respectively. The investigations were devoted to understand the origin of the electrical conductivity evolution with the microstructure by analyzing the local order and defect involvement in the crystalline sites of ZnO ceramics. Experimental investigations of particles were conducted to probe the local order and electronic defects with an emphasis on the electrical behavior of ceramics. Particularly, Al doping is intimately correlated with the high conductivity induced from the stabilization of particular AlZn-Zni complexes. The conduction electrons are probed through the induced Knight Shift on NMR spectra and also from the particular relaxation mechanisms of paramagnetic centers revealed by EPR studies. The correlation between the electronic active defects, the microstructure in small sized particles of ZnO based ceramics and the electrical behavior are pointed out and discussed.



中文翻译:

微结构对(Al,Ti,Mg)共掺杂ZnO导电陶瓷的局部有序化和电子缺陷的影响

通过适当的研磨和机械球磨分别获得具有不同尺寸的(Al,Ti,Mg)氧化物共掺杂的ZnO陶瓷的细颗粒。该研究致力于通过分析ZnO陶瓷晶体位置的局部顺序和缺陷参与来了解电导率演化与微观结构的起源。进行了粒子的实验研究,以探究局部缺陷和电子缺陷,重点是陶瓷的电学行为。特别地,Al掺杂与由特定Al Zn -Zn i的稳定化引起的高电导率紧密相关。复合体。传导电子通过NMR光谱上的感应奈特位移以及EPR研究揭示的顺磁中心的特定弛豫机制进行探测。指出并讨论了电子活性缺陷,ZnO基陶瓷小颗粒的微观结构与电学行为之间的关系。

更新日期:2020-06-12
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