Details
| Original language | English |
|---|---|
| Pages (from-to) | 1905-1909 |
| Number of pages | 5 |
| Journal | Ceramics International |
| Volume | 37 |
| Issue number | 6 |
| Early online date | 19 Feb 2011 |
| Publication status | Published - Aug 2011 |
Abstract
NiFe2-xBixO4 (x = 0, 0.1, 0.15) nanopowders were synthesized via sol-gel method. The precursor gels were calcined at 773 K in air for 1 h to obtain the pure nanostructured NiFe 2-xBixO4 spinel phase. The crystal structure and magnetic properties of the substituted spinel series of NiFe 2-xBixO4 have been investigated by means of 57Fe Mössbauer spectroscopy, transmission electron microscopy and alternating gradient force magnetometry. Mössbauer spectroscopic measurements revealed that Bi3+ cations tend to occupy octahedral positions in the structure of the substituted ferrite, i.e., the crystal-chemical formula of the as-prepared nanoparticles may be written as: (Fe)[NiFe1-xBix]O4 (x = 0, 0.1, 0.15), where parentheses and square brackets enclose cations on sites of tetrahedral and octahedral coordination, respectively. Selective area electron diffraction studies provided evidence that the samples of the NiFe2-xBi xO4 series, independently of x, exhibit the cubic spinel structure. The values of the saturation magnetization and the coercive field of NiFe2-xBixO4 nanoparticles were found to decrease with increasing degree of bismuth substitution.
Keywords
- D. Ferrite, Mössbauer spectroscopy, Nanostructured materials, Sol-gel method
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Materials Science(all)
- Ceramics and Composites
- Chemical Engineering(all)
- Process Chemistry and Technology
- Materials Science(all)
- Surfaces, Coatings and Films
- Materials Science(all)
- Materials Chemistry
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In: Ceramics International, Vol. 37, No. 6, 08.2011, p. 1905-1909.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Structural and magnetic properties of NiFe2-xBi xO4 (x = 0, 0.1, 0.15) nanoparticles prepared via sol-gel method
AU - Nasr Isfahani, Mohammad Javad
AU - Isfahani, Parisa Nasr
AU - Da Silva, Klebson Lucenildo
AU - Feldhoff, Armin
AU - Šepelák, Vladimir
N1 - Funding Information: MJNI thanks the Iranian Nanotechnology Initiative for the support of this work. Partial support by the DFG is gratefully acknowledged.
PY - 2011/8
Y1 - 2011/8
N2 - NiFe2-xBixO4 (x = 0, 0.1, 0.15) nanopowders were synthesized via sol-gel method. The precursor gels were calcined at 773 K in air for 1 h to obtain the pure nanostructured NiFe 2-xBixO4 spinel phase. The crystal structure and magnetic properties of the substituted spinel series of NiFe 2-xBixO4 have been investigated by means of 57Fe Mössbauer spectroscopy, transmission electron microscopy and alternating gradient force magnetometry. Mössbauer spectroscopic measurements revealed that Bi3+ cations tend to occupy octahedral positions in the structure of the substituted ferrite, i.e., the crystal-chemical formula of the as-prepared nanoparticles may be written as: (Fe)[NiFe1-xBix]O4 (x = 0, 0.1, 0.15), where parentheses and square brackets enclose cations on sites of tetrahedral and octahedral coordination, respectively. Selective area electron diffraction studies provided evidence that the samples of the NiFe2-xBi xO4 series, independently of x, exhibit the cubic spinel structure. The values of the saturation magnetization and the coercive field of NiFe2-xBixO4 nanoparticles were found to decrease with increasing degree of bismuth substitution.
AB - NiFe2-xBixO4 (x = 0, 0.1, 0.15) nanopowders were synthesized via sol-gel method. The precursor gels were calcined at 773 K in air for 1 h to obtain the pure nanostructured NiFe 2-xBixO4 spinel phase. The crystal structure and magnetic properties of the substituted spinel series of NiFe 2-xBixO4 have been investigated by means of 57Fe Mössbauer spectroscopy, transmission electron microscopy and alternating gradient force magnetometry. Mössbauer spectroscopic measurements revealed that Bi3+ cations tend to occupy octahedral positions in the structure of the substituted ferrite, i.e., the crystal-chemical formula of the as-prepared nanoparticles may be written as: (Fe)[NiFe1-xBix]O4 (x = 0, 0.1, 0.15), where parentheses and square brackets enclose cations on sites of tetrahedral and octahedral coordination, respectively. Selective area electron diffraction studies provided evidence that the samples of the NiFe2-xBi xO4 series, independently of x, exhibit the cubic spinel structure. The values of the saturation magnetization and the coercive field of NiFe2-xBixO4 nanoparticles were found to decrease with increasing degree of bismuth substitution.
KW - D. Ferrite
KW - Mössbauer spectroscopy
KW - Nanostructured materials
KW - Sol-gel method
UR - http://www.scopus.com/inward/record.url?scp=79957442027&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2011.02.003
DO - 10.1016/j.ceramint.2011.02.003
M3 - Article
AN - SCOPUS:79957442027
VL - 37
SP - 1905
EP - 1909
JO - Ceramics International
JF - Ceramics International
SN - 0272-8842
IS - 6
ER -