Investigations on the Structural, Morphological, Electrical, and Magnetic Properties of CuFe2O4-NiO Nanocomposites
IR@CECRI: CSIR-Central Electrochemical Research Institute, Karaikudi
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Title |
Investigations on the Structural, Morphological, Electrical, and
Magnetic Properties of CuFe2O4-NiO Nanocomposites
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Creator |
Kalaiselvan, R.
Krishnan, V. Augustin, C.O. Bertagnolli, H. Kim, C.S. Gedanken, A. |
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Subject |
Electropyrometallurgy
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Description |
CuFe2O4-xNiO (x ) 1, 5, 10, and 20 wt %) nanocomposites have been successfully prepared by a
simple combustion method using urea-nitrate precursors. The samples were sintered at different
temperatures, namely 600, 800, 1000, and 1100 °C, for 5 h to enhance the compound formation and
phase purity, studied by means of XRD patterns. Then the 1100 °C sintered sample was further
characterized for its structural (EXAFS, XANES, FT-IR, UV–vis), morphological (SEM, TEM, HRTEM,
SAED), electrical (ac conductivity, dielectric constant, dielectric loss tangent), and magnetic (Mössbauer)
properties. The EXAFS and XANES studies reveal the formation of NiFe2O4 and CuO, in addition to the
existence of CuFe2O4 and NiO phases. A partial substitution of metal cations by nickel ions could also
be evidenced. The stretching and bending vibration of the tetrahedral and octahedral complexes have
been established from FT-IR spectra. The UV–vis spectra elucidate that the prepared materials are
semiconductors and also show the quantum size confinement effect. The well-defined grain and grain
boundary structure was identified from the SEM studies. The nanosize of the synthesized materials has
been identified by TEM investigations. The HRTEM and SAED images reveal the crystallinity and
polycrystalline behavior of the as-synthesized materials. The electrical studies show the normal
ferrimagnetic behavior of the materials. The inverse spinel nature of the materials has been enumerated
from Mössbauer spectra, which also illustrates the phase transition behavior.
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Publisher |
American Chemical Society
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Date |
2008
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Type |
Article
PeerReviewed |
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Format |
application/pdf
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Identifier |
http://cecri.csircentral.net/46/1/015-2008.pdf
Kalaiselvan, R. and Krishnan, V. and Augustin, C.O. and Bertagnolli, H. and Kim, C.S. and Gedanken, A. (2008) Investigations on the Structural, Morphological, Electrical, and Magnetic Properties of CuFe2O4-NiO Nanocomposites. Chem. Mater., 20 (2). pp. 429-439. |
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Relation |
http://cecri.csircentral.net/46/
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