The variation of Mn-dopant distribution state with x and its effect on the magnetic coupling mechanism in Zn1-xMnxO nanocrystals

doi:10.1088/1674-1056/22/10/107501

Abstract Zn_1-xMn_xO (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.

Keywords: magnetic semiconductors X-ray absorption fine structure impurity distribution exchange and superexchange interactions

Received: 16 April 2013
Revised: 09 May 2013
Accepted manuscript online:

PACS:	75.50.Pp	(Magnetic semiconductors)
	78.70.Dm	(X-ray absorption spectra)
	61.72.sh	(Impurity distribution)
	75.30.Et	(Exchange and superexchange interactions)

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

Corresponding Authors: Hao Wei-Chang, Xu Huai-Zhe
E-mail: whao@buaa.edu.cn;hzxu@buaa.edu.cn

Cite this article:

Cheng Yan (程岩), Hao Wei-Chang (郝维昌), Li Wen-Xian (李文献), Xu Huai-Zhe (许怀哲), Chen Rui (陈蕊), Dou Shi-Xue (窦士学) The variation of Mn-dopant distribution state with x and its effect on the magnetic coupling mechanism in Zn_1-xMn_xO nanocrystals 2013 Chin. Phys. B 22 107501

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The variation of Mn-dopant distribution state with x and its effect on the magnetic coupling mechanism in Zn1-xMnxO nanocrystals

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The variation of Mn-dopant distribution state with x and its effect on the magnetic coupling mechanism in Zn_1-xMn_xO nanocrystals