Study of ferromagnetism in Bi2S3 and ZnS nanocrystalline powders |
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| Authors: | Yongjia ZhangHongwei Qin Yayan BaoJifan Hu |
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| Institution: | a School of Physics, State Key Laboratory for Crystal Materials, Shandong University, Jinan 250100, People''s Republic of China
b School of Chemical Engineering, Shanxi Datong University, Datong 037009, People''s Republic of China |
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| Abstract: | Results of magnetic measurements suggested that Bi2S3 and ZnS nanocrystalline powders prepared by hydrothermal method could possibly exhibit room temperature ferromagnetism. The measured saturation magnetization of the powders increases with an increase of annealing temperature from 300 to 500 °C. Ab initio calculations suggested that the cation vacancies on the surface of Bi2S3 and ZnS nanograins could be responsible for the observed magnetic moments. Heat-treatment of Bi2S3 or ZnS nanocrystalline powders in Bi or Zn vapor could bring about an enhancement of ferromagnetism. The calculation results indicated that the interstitial Bi or Zn atoms in Bi2S3 (0 0 1) or ZnS (0 0 1) surface could induce magnetic moments. |
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| Keywords: | Magnetism Magnetic measurement Ab initio calculations Vacancy Interstitial |
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