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Electrical and magnetic properties of spinel ZnCr2-xFexO4 (0≤x≤1.0)

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Ahn,  K. S.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Yoon, S. J., Lee, S. H., Kim, K. H., & Ahn, K. S. (2002). Electrical and magnetic properties of spinel ZnCr2-xFexO4 (0≤x≤1.0). Materials Chemistry and Physics, 73(2-3), 330-334.


Cite as: https://hdl.handle.net/21.11116/0000-000E-EDF5-3
Abstract
The spinel ZnCr2-xFexO4 (0 less than or equal to X less than or
equal to 1.0) systems were synthesized in air under atmospheric
pressure, and showed single spinel phases in the XRD patterns,
and lattice parameters increased by increasing Fe3+ ion
substitution. From IR measurement, it was found that the Zn2+
ion was only at tetrahedral site and the Fe3+ ion was only at
octahedral site by substitution. In the electrical conductivity
measurements, it was shown that the more substitution of Fe
ions, the less conductivity because of electron-hole
compensation of Fe2+-hole produced from Fe3+ ion.
Electroconduction mechanism was a small polaron hopping
mechanism, which was explained by electron exchange between
Cr3+ and Cr4+, and between Fe3+ and Fe2+. The thermal EMF
measurement showed that these systems were n-type
semiconductors. From the magnetic and susceptibility
measurements, the spinel ZnCr2-xFexO4 systems were found to
exhibit anti-ferromagnetism. It was also found that the A site
was occupied by only Zn2+ ion, and that magnetic moments depend
upon B-B sub-lattice interaction. (C) 2002 Published by
Elsevier Science B.V.