期刊
CHEMICAL PHYSICS LETTERS
卷 477, 期 4-6, 页码 360-364出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2009.07.037
关键词
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Positron annihilation spectroscopy has been used to explore the nature of defects and to estimate the defect concentrations in ferromagnetic MgO nanoparticles. Our experimental results show that Mg vacancies or Mg vacancy concentration are present approximately at the concentration of 3.4 x 10(16) cm(-3) in the nano-crystalline MgO which is twice the value that obtained for bulk sample. This is in correlation with the decrease of the intensity of blue luminescence and the saturation magnetic moment with increasing particle size. These results clearly demonstrate that the origin of magnetic moment and thus the ferromagnetism in MgO nanoparticles is due to Mg related vacancies at the surface of the particles. (C) 2009 Elsevier B. V. All rights reserved.
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