M ssbauer Study and Atomic Migration in MgFe2O4

  • Lee, Seung Wha (Chungbuk National University) ;
  • Yoon, Sung Hyun (Kunsan National University) ;
  • An, Sung Yong (Kookmin University) ;
  • Kim, Woo Chul (Kookmin University) ;
  • Kim, Chul Sung (Kookmin University)
  • Published : 1999.12.01

Abstract

$MgFe_2O_4$ has been studied with X-ray diffraction, M ssbauer spectroscopy and vibration sample magnetometer (VSM). The crystal structure of the sample is found to have a cubic spinel structure with a lattice constant of $a_0=8.390$\pm$0.005$\AA$.$ The iron ions at both A (tetrahedral) and B (octahedral)sites are found to be in ferric high-spin states. Its Neel temperature TN is found to be 710$\pm$3 K. The Debye temperature for the A and B sites found to be 417$\pm$5 K and 331$\pm$5 K., respectively. Atomic migation from the A to the B sites starts near 425 K and increases rapidly with increasing temperature to such a degree that 31% of the ferric ions at the A sites have moved over to the B sites by 600 K.

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References

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