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Magnetic Transitions Studied by Electrically Based Methods in Mn-Zn Ferrite

Published online by Cambridge University Press:  10 February 2011

P. Gutiérrez ,
A. Peláiz ,
A. Huanosta  and
R. Valenzuela
P. Gutiérrez
Affiliation:
Institute for Materials Research, National University of Mexico, Mexico.
A. Peláiz
Affiliation:
Institute for Materials Research, National University of Mexico, Mexico.
A. Huanosta
Affiliation:
Institute for Materials Research, National University of Mexico, Mexico.
R. Valenzuela
Affiliation:
Institute for Materials Research, National University of Mexico, Mexico.
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Abstract

The thermal variations in electrical conductivity of polycrystalline Mn-Zn ferrites was investigated by impedance spectroscopy. Two well defined semicircles were observed in complex impedance plots, which were associated with grain (or bulk) and grain boundary impedance response, for the high and low frequency ranges, respectively. From these results, the characteristic relaxation frequencies were obtained for each process. The grain boundary frequency exhibited a monotonous behavior as a function of temperature, while the bulk frequency showed a maximum at 132 °C. By a magnetic method, it was verified that this temperature corresponds to the Curie transition. These results show therefore that a magnetic phase transition can be studied by means of electrical methds.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 500: Symposium EE – Electrically Based Microstructural Characterization II , 1997 , 147
Copyright
Copyright © Materials Research Society 1998

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References

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