Hyperfine Interactions

, Volume 68, Issue 1–4, pp 421–424 | Cite as

The investigation of magnetite microcrystals

  • Zheng Hu
  • Xielong Yang
  • Yuanfu Hsia
  • Xinhua Jiang
  • Xinshu Chen
  • Yuanhui He
Magnetism and Magnetic Materials

Abstract

Four samples of Fe3O4 microcrystals with average particle size of 72, 88, 100, 100Å have been investigated by Mössbauer spectroscopy, accompanied with x-ray diffraction and transmission electron microscopy. The experimental results show that the anisotropy energy constantK increases as the particle size decreases. It is found that a sudden drop ofK exists around Verwey transition temperatureT v andK remains constant in temperature well aboveT v . The Verwey temperatureT v for Fe3O4 microcrystals with different particle size is almost the same as that of bulk magnetite.

Keywords

Spectroscopy Particle Size Microscopy Electron Microscopy Thin Film 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. /1/.
    A. Tari, J. popplewell and S. W. Charles, D. St. P. Bunbury and K. M. Alves, J. Appl. Phys. 54(1983)3351ADSCrossRefGoogle Scholar
  2. /2/.
    S. Mørup, H. Topsoe and B. S. Clausen, Physica Scripta 25(1982)713ADSGoogle Scholar
  3. /3/.
    W. Winkler, Phys. Stat. Solidi(A) 84(1984)193MathSciNetGoogle Scholar
  4. /4/.
    Yu. F. Krupyanskii and I. P. Suzdalev, J. Physique 35(1974)C6–407Google Scholar
  5. /5/.
    H. Topsoe and S. Mørup, In Proc. Intern. Conf. on Mössbauer Spectroscopy, Vol. 1, Crakow, Poland (1975) ed. by A. Z. Hrynkiewich and J. A. Sawicki, p. 321Google Scholar
  6. /6/.
    S. Mørup and H. Topsoe, Appl. Phys. 11(1976)63ADSCrossRefGoogle Scholar
  7. /7/.
    R. Birringer, H. Gleiter, H. P. Klein and P. Marquardt, Phys. Lett. 102A(1984)365ADSGoogle Scholar
  8. /8/.
    S. Mørup, H. Topsoe and J. Lipka, J. Physique 37(1976)C6–287Google Scholar
  9. /9/.
    Z. Hu, X. Yang, R. Liu, X. Chen, Y. He and Y. Hsia, Hyp. Int. 57(1990)1871CrossRefGoogle Scholar
  10. /10/.
    X. Yang, X. Sun and N. Zhou, Appl. Phys. A 42(1987)65CrossRefGoogle Scholar
  11. /11/.
    S. Mørup, J. Magn. Magn. Mat. 37(1983)39ADSCrossRefGoogle Scholar

Copyright information

© J.C. Baltzer A.G., Scientific Publishing Company 1991

Authors and Affiliations

  • Zheng Hu
    • 1
  • Xielong Yang
    • 2
  • Yuanfu Hsia
    • 1
  • Xinhua Jiang
    • 3
  • Xinshu Chen
    • 4
  • Yuanhui He
    • 3
  1. 1.Department of PhysicsNanjing UniversityNanjingChina
  2. 2.Department of PhysicsEast China Normal UniversityShanghaiChina
  3. 3.Central LaboratoryDepartment of Geological and Mineral ProductsJiangsu ProvinceChina
  4. 4.Southwest Institute of Applied MagneticsMianyangChina

Personalised recommendations