The structure and magnetic properties of Zn1−xNixFe2O4 ferrite nanoparticles prepared by sol–gel auto-combustion

Zhang, H.E.; Zhang, B.F.; Wang, G.F.; Dong, Xiaoqing; Gao, Yu

doi:10.1016/j.jmmm.2006.09.016

Cited by 133 publications

(59 citation statements)

References 19 publications

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“…2a and 2b reveal that the vibration band of C-O bond shifts from 1113 cm −1 for pure TREG to 1103 cm −1 for the current CoFe 2 O 4 nanocrystals which indicates that the oxygen atom of C-O bond coordinates with the metal [7,13,[20][21][22][23][24][25][26]. Figure 3 shows the TGA and differential thermogram (DTG) curves for synthesized CoFe 2 O 4 nanoparticles via polyol method with TREG.…”

Section: Ft-ir Analysismentioning

confidence: 98%

Triethylene Glycol Stabilized CoFe2O4 Nanoparticles

Baykal

Deligöz

Sözeri

et al. 2012

J Supercond Nov Magn

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We report on the synthesis and detailed composition, thermal, micro-structural, ac-dc conductivity performance and dielectric permittivity characterization of triethylene glycol (TREG) stabilized CoFe 2 O 4 nanoparticles synthesized by polyol method. XRD analysis confirmed the inorganic phase as CoFe 2 O 4 with high phase purity. Microstructure analysis with TEM revealed well separated, spherical nanoparticles in the order of 6 nm, which is also confirmed by X-ray line profile fitting. FT-IR analysis confirms that TREG is successfully coated on the surface of nanoparticles. Overall conductivity of nanocomposite is approximately two magnitudes lower than that of TREG with increase in temperature. The ac conductivity showed a temperature dependent behavior at low frequencies and temperature independent behavior at high frequencies which is an indication of ionic conductivity. The dc conductivity of the nanocomposites and pure TREG are found to obey the Ar-A. Baykal ( ) · Z. Durmus rhenius plot with dc activation energies of 0.258 eV and 0.132 eV, respectively. Analysis of dielectric permittivity functions suggests that ionic and polymer segmental motions are strongly coupled in the nanocomposite. TREG stabilized CoFe 2 O 4 nanoparticles has lower ε and ε than that of pure TREG due to the doping of cobalt. As the temperature increases, the frequency at which (ε ) reaches a maximum shifted towards higher frequencies. On the other hand, the activation energy of TREG for relaxation process was found to be 0.952 eV which indicates the predominance of electronic conduction due to the chemical nature of TREG. Contrarily, no maximum peak of tan δ was observed for the nanocomposite due to the being out of temperature and frequency range applied in the study.

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Section: Ft-ir Analysismentioning

confidence: 98%

Triethylene Glycol Stabilized CoFe2O4 Nanoparticles

Baykal

Deligöz

Sözeri

et al. 2012

J Supercond Nov Magn

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“…The attractively sol-gel favors could be represented in the ability to overcome the most drawbacks resulted from the conventional process as well as the ability to produce the nano-sized ferrite particles. The investigations on the nano-crystalline ferrite particles containing nickel and zinc using the sol-gel methods have been given much attention [2][3][4]. However, the principle requirements of the ferrites have been less reported.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Permeability and Microstructure of the Optimal Nickel-Zinc Ferrites by Sol-Gel Route

Zahi¹

2010

JEMAA

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“…substituted ZnFe 2 O 4 nanoparticles (i.e., Zn 1-x Ni x Fe 2 O 4 ), maximum magnetization (M s ) has been found in the composition of Zn 0.6 Ni 0.4 Fe 2 O 4 or Zn 0.5 Ni 0.5 Fe 2 O 4 [14,15], which is different from the bulk composition of Zn 0.4 Ni 0.6 Fe 2 O 4 [16,17]. Zhang et al [18] explained this behavior on the basis of non-collinear spin configuration in these nanoparticles caused by broken exchange interactions in surface layers. Whereas, Verma et al [19] reported an enhancement of Curie temperature up to *100 K for Zn-Ni ferrite nanoparticles when compared to that of the bulk [20].…”

Section: Introductionmentioning

confidence: 98%

Sol–gel synthesis of nanocrystalline Zn1−xNixFe2O4 ceramics and its structural, magnetic and dielectric properties

Atif

Nadeem

2014

J Sol-Gel Sci Technol

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Zn 1-x Ni x Fe 2 O 4 (0.0 B x B 1.0) nanoparticles are prepared by sol-gel method using urea as a neutralizing agent. The evaluation of XRD patterns and TEM images indicated fine particle nature. The average crystallite size increased from 10 to 24 nm, whereas lattice parameters and density decreased with increasing Ni content (x). Infrared spectra showed characteristic features of spinel structure along with a strong influence of compositional variation. Magnetic measurements reveal a maximum saturation magnetization for Zn 0.5 Ni 0.5 Fe 2 O 4 (x = 0.5); however, reduced value of magnetization is attributed to the canted spin structure and weakening of Fe 3? (A)-Fe 3? (B) interactions at the surface of the nanoparticles. Impedance analysis for different electro-active regions are carried out at room temperature with Ni substitution. The existence of different relaxations associated with grain, grain boundaries and electrode effects are discussed with composition. It is suggested that x = 0.5 is an optimal composition in Zn 1-x Ni x Fe 2 O 4 system with moderate magnetization, colossal resistivity and high value of dielectric constant at low frequency for their possible usage in field sensor applications.

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The structure and magnetic properties of Zn1−xNixFe2O4 ferrite nanoparticles prepared by sol–gel auto-combustion

Cited by 133 publications

References 19 publications

Triethylene Glycol Stabilized CoFe2O4 Nanoparticles

Triethylene Glycol Stabilized CoFe2O4 Nanoparticles

Synthesis, Permeability and Microstructure of the Optimal Nickel-Zinc Ferrites by Sol-Gel Route

Sol–gel synthesis of nanocrystalline Zn1−xNixFe2O4 ceramics and its structural, magnetic and dielectric properties

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