Critical Analysis on the Structural and Magnetic Properties of Bulk and Nanocrystalline Cu-Fe-O

Authors

D. Paul Joseph, Materials Science Centre, Department of Nuclear Physics, University of Madras, Guindy Campus, Chennai 600 025, India; Center for Condensed Matter Sciences, National Taiwan University, Taipei Taiwan
C. Venkateswaran, Materials Science Centre, Department of Nuclear Physics, University of Madras, Guindy Campus, Chennai 600 025, India
R. Selva Vennila, Center for Study of Matter at Extreme Conditions, Florida International University, Miami, FL; Lawrence Berkeley National Laboratory, Advanced Light Source, Berkeley, CA

Date of this Version

12-16-2010

Document Type

Article

Abstract

Nanocrystalline and bulk samples of “Fe”-doped CuO were prepared by coprecipitation and ceramic methods. Structural and compositional analyses were performed using X-ray diffraction, SEM, and EDAX. Traces of secondary phases such as CuFe₂O₄, Fe₃O₄, and α-Fe₂O₃ having peaks very close to that of the host CuO were identified from the Rietveld profile analysis and the SAED pattern of bulk and nanocrystalline Cu_0.98Fe_0.02O samples. Vibrating Sample Magnetometer (VSM) measurements show hysteresis at 300 K for all the samples. The ferrimagnetic Neel transition temperature () was found to be around 465°C irrespective of the content of “Fe”, which is close to the value of cubic CuFe₂O₄. High-pressure X-Ray diffraction studies were performed on 2% “Fe”-doped bulk CuO using synchrotron radiation. From the absence of any strong new peaks at high pressure, it is evident that the secondary phases if present could be less than the level of detection. Cu₂O, which is diamagnetic by nature, was also doped with 1% of “Fe” and was found to show paramagnetic behavior in contrast to the “Fe” doped CuO. Hence the possibility of intrinsic magnetization of “Fe”-doped CuO apart from the secondary phases is discussed based on the magnetization and charge state of “Fe” and the host into which it is substituted.

Comments

This article was originally published in Hindawi Advances in Materials Science and Engineering Volume 2010 (2010).

Creative Commons License

This work is licensed under a Creative Commons Attribution 2.0 License.

Recommended Citation

D. Paul Joseph, C. Venkateswaran, and R. Selva Vennila, “Critical Analysis on the Structural and Magnetic Properties of Bulk and Nanocrystalline Cu-Fe-O,” Advances in Materials Science and Engineering, vol. 2010, Article ID 715872, 14 pages, 2010. doi:10.1155/2010/715872