Structural stability study of cobalt ferrite-based nanoparticle using micro Raman spectroscopy

Soler, Maria A. G.; Melo, T.F.O.; Silva, S. W. da; Lima, E.C.D.; Pimenta, A.C.M.; Garg, V. K.; Oliveira, A. C.; Morais, P.C.

doi:10.1016/j.jmmm.2003.12.582

Cited by 56 publications

(24 citation statements)

References 10 publications

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“…The phase identity was confirmed by Raman spectroscopy which shows the characteristic modes of the cubic inverse-spinel structure of cobalt ferrite (Supporting Information). [14] XRD diffractograms were also in good agreement with the reported structure for cobalt ferrite (Supporting Information). [15] Magnetometry studies demonstrated the ferromagnetic nature of the nanocomposites (Supporting Information).…”

supporting

confidence: 84%

NMR Relaxation of Water in Nanostructures: Analysis of Ferromagnetic Cobalt-Ferrite Polyelectrolyte Nanocomposites

et al. 2011

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supporting

confidence: 84%

NMR Relaxation of Water in Nanostructures: Analysis of Ferromagnetic Cobalt-Ferrite Polyelectrolyte Nanocomposites

et al. 2011

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“…A group theory treatment leads to 42 Raman active modes for SrFe 12 O 19 (11A 1g + 14E 1g + 17E 2g ) [14][15][16]. As for CoFe 2 O 4 , there are five Raman active modes (A g + E g + 3E 2g ) [17][18][19]. Three modes of CoFe 2 O 4 287 cm −1 , 457 cm −1 and 663 cm −1 can be seen in Fig.…”

Section: Resultsmentioning

confidence: 93%

Synthesis and characterization of SrFe12O19/CoFe2O4 nanocomposites with core-shell structure

Zhang

2009

Journal of Alloys and Compounds

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“…symmetry space group has 39 normal vibrational modes, out of which the five active Raman modes are 3T 2g +E g +A 1g [35,36]. However there are additional 12 Raman modes which are inactive include: T 1g , 2A 2u , 2E u , 4T 1u (IR),T 1g (acoustic), and 2T 2u are largely inactive in spinel structure.…”

Section: Raman Spectroscopymentioning

confidence: 99%

Chemical bonding and magnetic properties of gadolinium (Gd) substituted cobalt ferrite

Puli

Adireddy

Ramana

2015

Journal of Alloys and Compounds

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Polycrystalline gadolinium (Gd) substituted cobalt ferrites (CoFe 2-x Gd x O 4 ; x=0-0.3, referred to CFGO) ceramics have been synthesized by solid state reaction method. Chemical bonding, crystal structure and magnetic properties of CFGO compounds have been evaluated as a function of Gd-content. X-ray diffraction and Raman spectroscopic analyses confirmed the formation of inverse spinel structure. However, a secondary ortho-ferrite phase (GdFeO 3 ) nucleates for higher values of Gd-content. A considerable increase in the saturation magnetization has been observed upon the initial substitution of Gd (x=0.1). The saturation magnetization drastically decreases at higher Gd content (x≥0.3). No contribution from ortho-ferrite GdFeO 3 phase is noted to the magnetic properties. The increase in the magnetic saturation magnetization is attributed to the higher magnetic moment of Gd 3+ (4f 7 ) residing in octahedral sites is higher when compared to that of Fe 3+ (3d 5 ) and as well due to the migration of Co 2+ (3d 7 ) ions from the octahedral to the tetrahedral sites with a magnetic moment aligned anti-parallel to those of rare earth (RE 3+ ) ions in the spinel lattice. Increase in coercivity with increase in Gd 3+ is content is attributed to magnetic anisotropy in the ceramics.

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Structural stability study of cobalt ferrite-based nanoparticle using micro Raman spectroscopy

Cited by 56 publications

References 10 publications

NMR Relaxation of Water in Nanostructures: Analysis of Ferromagnetic Cobalt-Ferrite Polyelectrolyte Nanocomposites

NMR Relaxation of Water in Nanostructures: Analysis of Ferromagnetic Cobalt-Ferrite Polyelectrolyte Nanocomposites

Synthesis and characterization of SrFe12O19/CoFe2O4 nanocomposites with core-shell structure

Chemical bonding and magnetic properties of gadolinium (Gd) substituted cobalt ferrite

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