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Manipulating coupling state and magnetism of Mn-doped ZnO nanocrystals by changing the coordination environment of Mn via hydrogen annealing

Journal Article


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Abstract


  • Mn-doped ZnO nanocrystals are synthesized by a wet chemical route and treated in H2/Ar atmosphere with different H2/Ar ratios. It is found that hydrogen annealing could change the coordination environment of Mn in ZnO lattice and manipulate the magnetic properties of Mn-doped ZnO. Mn ions initially enter into interstitial sites and a Mn3+O6 octahedral coordination is produced in the prepared Mn-doped ZnO sample, in which the nearest neighbor Mn3+ and O2 ions could form a Mn3+-O2--Mn3+ complex. After H2 annealing, interstitial Mn ions can substitute for Zn to generate the Mn2+O4 tetrahedral coordination in the nanocrystals, in which neighboring Mn2+ ions and H atoms could form a Mn2+-O2--Mn2+ complex and Mn-H-Mn bridge structure. The magnetic measurement of the as-prepared sample shows room temperature paramagnetic behavior due to the Mn3+-O2--Mn3+ complex, while the annealed samples exhibit their ferromagnetism, which originates from the Mn-H-Mn bridge structure and the Mn-Mn exchange interaction in the Mn2+-O2--Mn2+ complex.

Authors


  •   Cheng, Yan (external author)
  •   Li, W (external author)
  •   Hao, Weichang (external author)
  •   Xu, Huaizhe (external author)
  •   Xu, Zhongfei (external author)
  •   Zheng, Li Rong. (external author)
  •   Zhang, Jing (external author)
  •   Dou, Shi Xue
  •   Wang, Tianmin (external author)

Publication Date


  • 2016

Citation


  • Cheng, Y., Li, W., Hao, W., Xu, H., Xu, Z., Zheng, L. Rong., Zhang, J., Dou, S. & Wang, T. (2016). Manipulating coupling state and magnetism of Mn-doped ZnO nanocrystals by changing the coordination environment of Mn via hydrogen annealing. Chinese physics B, 25 (1), 017301-1-017301-8.

Scopus Eid


  • 2-s2.0-84955302071

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2747&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1745

Start Page


  • 017301-1

End Page


  • 017301-8

Volume


  • 25

Issue


  • 1

Abstract


  • Mn-doped ZnO nanocrystals are synthesized by a wet chemical route and treated in H2/Ar atmosphere with different H2/Ar ratios. It is found that hydrogen annealing could change the coordination environment of Mn in ZnO lattice and manipulate the magnetic properties of Mn-doped ZnO. Mn ions initially enter into interstitial sites and a Mn3+O6 octahedral coordination is produced in the prepared Mn-doped ZnO sample, in which the nearest neighbor Mn3+ and O2 ions could form a Mn3+-O2--Mn3+ complex. After H2 annealing, interstitial Mn ions can substitute for Zn to generate the Mn2+O4 tetrahedral coordination in the nanocrystals, in which neighboring Mn2+ ions and H atoms could form a Mn2+-O2--Mn2+ complex and Mn-H-Mn bridge structure. The magnetic measurement of the as-prepared sample shows room temperature paramagnetic behavior due to the Mn3+-O2--Mn3+ complex, while the annealed samples exhibit their ferromagnetism, which originates from the Mn-H-Mn bridge structure and the Mn-Mn exchange interaction in the Mn2+-O2--Mn2+ complex.

Authors


  •   Cheng, Yan (external author)
  •   Li, W (external author)
  •   Hao, Weichang (external author)
  •   Xu, Huaizhe (external author)
  •   Xu, Zhongfei (external author)
  •   Zheng, Li Rong. (external author)
  •   Zhang, Jing (external author)
  •   Dou, Shi Xue
  •   Wang, Tianmin (external author)

Publication Date


  • 2016

Citation


  • Cheng, Y., Li, W., Hao, W., Xu, H., Xu, Z., Zheng, L. Rong., Zhang, J., Dou, S. & Wang, T. (2016). Manipulating coupling state and magnetism of Mn-doped ZnO nanocrystals by changing the coordination environment of Mn via hydrogen annealing. Chinese physics B, 25 (1), 017301-1-017301-8.

Scopus Eid


  • 2-s2.0-84955302071

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2747&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1745

Start Page


  • 017301-1

End Page


  • 017301-8

Volume


  • 25

Issue


  • 1