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Conduction Characteristics of Charge Ordering Type Ferroelectrics,YFe2O4

Published online by Cambridge University Press:  26 February 2011

Ken Imamura ,
Yoichi Horibe ,
Takeshi Yoshimura ,
Norifumi Fujimura ,
Shigeo Mori  and
Naoshi Ikeda
Ken Imamura
Affiliation:
imamura-k@pe.osakafu-u.ac.jp, Osaka Prefecture Univ., Graduate School of Engneering, 1-1 Gakuen-cho,Naka-ku, Sakai, N/A, Japan
Yoichi Horibe
Affiliation:
imamura-k@pe.osakafu-u.ac.jp, Osaka Prefecture Univ., Sakai,Osaka, N/A, Japan
Takeshi Yoshimura
Affiliation:
tyoshi@pe.osakafu-u.ac.jp, Osaka Prefecture Univ., Sakai,Osaka, N/A, Japan
Norifumi Fujimura
Affiliation:
fujim@pe.osakafu-u.ac.jp, Osaka Prefecture Univ., Sakai,Osaka, N/A, Japan
Shigeo Mori
Affiliation:
smori@p.s.osakafu-u.ac.jp, Osaka Prefecture Univ., Sakai,Osaka, N/A, Japan
Naoshi Ikeda
Affiliation:
imamura-k@pe.osakafu-u.ac.jp, Okayama Univ., Okayama, N/A, Japan
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Abstract

Electrical conduction properties of charge ordering type ferroelectrics YFe2O4 were investigated. YFe2O4 was synthesized in reduced atmosphere at 1200 °C. Oxygen partial pressure of the reduced atmosphere was controlled by the equilibrium state of CO and CO2. YFe2O4 is paramagnetic at room temperature and has Néel temperature around 250K. The Néel temperature was decreased with increasing the amount of oxygen deficiency. Moreover, YFe2O4 showed ohmic conduction from 260 to 100 K. The temperature dependence of the DC conductivity showed an inflection point at the Néel temperature, which indicated the development of charge ordering of Fe2+ and Fe3+ ions. From the complex impedance measurements, the equivalent circuits of YFe2O4 with different oxygen deficiency were determined at various temperatures.

Keywords

ferroelectricityYFe
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 966: Symposium T – Ferroelectrics and Multiferroics , 2006 , 0966-T07-27
Copyright
Copyright © Materials Research Society 2007

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References

REFERENCES

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