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No.4(pp.107-135)

Home > Issues > Volume 4 (1999) > No.4(pp.107-135)

M ssbauer Study and Atomic Migration in MgFe₂O₄

Journal of Magnetics, Volume 4, Number 4, 31 Dec 1999, Pages 115-118

Seung-Wha Lee(School of Electrical and Electronics Engineering, Chungbuk National University), Sung-Hyun Yoon(Department of Physics, Kunsan National University), Sung-Yong An(Department of Physics, Kookmin University), Woo-Chul Kim(Department of Physics, Kookmin University), Chul-Sung Kim(Department of Physics, Kookmin University)

Abstract

MgFe₂O₄has been studied with X-ray diffraction, Mössbauer 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 a₀=8.390±0.005 Å. The iron ions at both A (tetrahedral) and B (octahedral)sites are found to be in ferric high-spin states. Its Néel temperature T_N is found to be 710±3 K. The Debye temperature for the A and B sites found to be 417±5 K and 331±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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