The variation of Mn-dopant distribution state with x and its effect on the magnetic coupling mechanism in Zn_(1-x) Mn_x O nanocrystals  

作　　者：程岩 郝维昌 李文献 许怀哲 陈蕊 窦士学 

机构地区：[1]Department of Physics and Center of Materials Physics and Chemistry,Beihang University [2]Institute for Superconducting and Electronic Materials (ISEM),University of Wollongong [3]Solar Energy Technologies,School of Computing,Engineering and Mathematics,University of Western Sydney [4]State Key Laboratory of Inorganic Synthesis and Preparative Chemistry,College of Chemistry,Jilin University

出　　处：《Chinese Physics B》2013年第10期516-521,共6页中国物理B（英文版）

基　　金：Project supported by the National Basic Research Program of China (Grant No.013CB934001);the National Natural Science Foundation of China (Grant No.51272015)

摘　　要：Zn1-xMnxO （x = 0.0005, 0.001, 0.005, 0.01, 0.02） nanocrystals are synthesized by using a wet chemical process. The coordination environment of Mn is characterized by X-ray photoelectron spectroscopy, Raman spectroscopy, and its X-ray absorption fine structure. It is found that the solubility of substitutional Mn in a ZnO lattice is very low, which is less than 0.4%. Mn ions first dissolve into the substitutional sites in the ZnO lattice, thereby forming Mn2＋O4 tetrahedral coordination when x ≤ 0.001, then entering into the interstitial sites and forming Mn3＋O6 octahedral coordination when x ≥ 0.005. All the samples exhibit paramagnetic behaviors at room temperature, and antiferromagnetic coupling can be observed below 100 K.Zn1-xMnxO （x = 0.0005, 0.001, 0.005, 0.01, 0.02） nanocrystals are synthesized by using a wet chemical process. The coordination environment of Mn is characterized by X-ray photoelectron spectroscopy, Raman spectroscopy, and its X-ray absorption fine structure. It is found that the solubility of substitutional Mn in a ZnO lattice is very low, which is less than 0.4%. Mn ions first dissolve into the substitutional sites in the ZnO lattice, thereby forming Mn2＋O4 tetrahedral coordination when x ≤ 0.001, then entering into the interstitial sites and forming Mn3＋O6 octahedral coordination when x ≥ 0.005. All the samples exhibit paramagnetic behaviors at room temperature, and antiferromagnetic coupling can be observed below 100 K.

关 键 词：magnetic semiconductors X-ray absorption fine structure impurity distribution exchange andsuperexchange interactions 

分 类 号：TB383.1[一般工业技术—材料科学与工程]