Crystallization and magnetic behavior of nanosized nickel ferrite prepared by citrate precursor method

Nguyet, Dao Thi Thuy; Duong, Nguyen Phuc; Hưng, Lê Thành; Hien, Than Duc; Satoh, Takuya

doi:10.1016/j.jallcom.2011.03.112

Cited by 55 publications

(19 citation statements)

References 23 publications

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“…These results are certain by the thermo-magnetisation M (T) measurements, and it suggests that the AFM might be the possible reason. Also, in accordance with the report [22], only 6 % change in Ms is observed between 300 and 5 K for 700°C annealed sample. The Curie curve resembles more like our M-T curve, and the Curie temperature Tc is observed at 900 K. This result concludes that the 700°C annealing process suppresses the parasitic phase, but not completely.…”

Section: Raman Spectra Analysissupporting

confidence: 92%

“…Thus, the citrate method offers a rare case of monophase nickel ferrite, and hence, calcination at 1,000°C for 1 h is required for the formation of pure nanocrystalline nickel ferrite or for any ferrite system [21]. The literature also shows that the formation of monophase nickel ferrite is possible by sintering at 700°C for 2 h [22]. Similarly, the 1,073 K annealed sample shows a single phase and, thus, conveys that above 700°C, a-Fe 2 O 3 and other phases are suppressed more effectively.…”

Section: Methodsmentioning

confidence: 99%

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A phenomenal behaviour of nanocrystalline NiFe2O4: influence of secondary and parasitic phases on structure and magnetic property

2015

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In this paper, we report the influence of secondary and parasitic magnetic phases on NiFe 2 O 4 (NFO) nanoparticles synthesised during citrate gel method. Annealing at 773 K showed the presence of secondary and parasitic phases, whereas annealing at 1,073 K for 3 h showed the quenching of the secondary and parasitic phases. X-ray diffraction (XRD) analysis confirmed the nickel ferrite phase, with a trace amount of a-Fe 2 O 3 peak found and other phases being not traceable. The observed a-Fe 2 O 3 peak vanished at 1,073 K annealing, and a single phase of nickel ferrite was formed. The surface morphology of the samples was studied by SEM, which showed the fine grains of nickel ferrite. Raman spectra of the annealed samples were measured and analysed in the range of 1,000-100 cm -1 . Further analysis of isothermal M-H curve, zero-field-cooled and field-cooled (ZFC-FC) measurement and thermo-magnetisation M (T) measurements were performed with the aid of vibrating sample magnetometer on the prepared samples. The measured ZFC-FC curve showed an existence of spin-glass behaviour due to the parasitic phase for 773 K annealed sample, which is quite difficult to be identified using XRD and Raman spectra. Further, we also observed the room temperature coercivity H c = 430 Oe from the M-H curve for the sample annealed at 773 K. Remarkably, both low-temperature and high-temperature M-T curve measurements showed the influence of secondary and parasitic phases for 773 and 1,073K annealed samples.

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Section: Raman Spectra Analysissupporting

confidence: 92%

Section: Methodsmentioning

confidence: 99%

A phenomenal behaviour of nanocrystalline NiFe2O4: influence of secondary and parasitic phases on structure and magnetic property

2015

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“…Several powder preparation techniques are available including conventional ball milling, and mechano-chemical synthesis, or high energy ball milling of inorganic oxide powders [5], and chemical methods such as co-precipitation [6], citrate precursor [7], hydrothermal [8], sol gel auto-combustion [9], reflux [10], electro spinning [11], sol gel [12] and reverse micelle [13] methods. Amongst these methods the sol-gel auto combustion technique is one of the most simplest and convenient, and yields high quality powders at a fast production rate with good chemical homogeneity and the preparation cost is low [14].…”

Section: Introductionmentioning

confidence: 99%

Dielectric and magnetic properties of Nickel ferrite ceramics using crystalline powders derived from DL alanine fuel in sol–gel auto-combustion

Chauhan

Shukla

Sreenivas

2015

Ceramics International

129

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“…Similarly, Chinnasamy et al [13] observed high value of magnetocrystalline anisotropy in the NiFe 2 O 4 nanoparticles resulted from the mixed spinel structure and canted spin structure at the surface and the core. Furthermore, Maaz et al [14] and Nguyet et al [15] found that the small size of the nanoparticles leads to finite-size and surface spin effects. According to them, thermal variation of saturation magnetization follows modified Bloch's law for ferromagnetic materials which is due to their finite-size effects, while below 50 K, an abrupt increase in magnetization is attributed to the surface contribution.…”

Section: Introductionmentioning

confidence: 99%

Cation distribution and enhanced surface effects on the temperature-dependent magnetization of as-prepared NiFe2O4 nanoparticles

Nadeem

Siddique

2015

Appl. Phys. A

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Nickel ferrite, i.e., NiFe 2 O 4 , nanoparticles are synthesized by sol-gel method using urea as a neutralizing agent. The formation of spinel phase and crystal structure of the as-prepared sample is analyzed by X-ray diffraction and transmission electron microscope. In order to confirm phase formation and cation arrangement, room temperature 57 Fe Mössbauer spectroscopy is employed. The degree of inversion (i) estimated from the relative peak area is found to be 0.6, which confirms a mixed spinel structure of the asprepared sample. Zero-field-cooled/field-cooled measurements showed evidence of superparamagnetic behavior associated with the nanosized particles. Hysteresis loop measurements revealed temperature-dependent magnetic properties: The coercive field (H C ) decreases with increasing temperature and deviates from the Kneller's law for ferromagnetic nanostructures; and the saturation magnetization (M s ) follows modified Bloch's law in the temperature range between 25 and 400 K. However, below 25 K, an abrupt increase in magnetization of nanoparticles is observed. In order to understand this behavior, an additional contribution has to be added to the core magnetization to properly fit the data. Hence, a surface correction term to the Bloch's law is found to describe the temperature dependence of magnetization in the core-shell NiFe 2 O 4 nanoparticles.

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Crystallization and magnetic behavior of nanosized nickel ferrite prepared by citrate precursor method

Cited by 55 publications

References 23 publications

A phenomenal behaviour of nanocrystalline NiFe2O4: influence of secondary and parasitic phases on structure and magnetic property

A phenomenal behaviour of nanocrystalline NiFe2O4: influence of secondary and parasitic phases on structure and magnetic property

Dielectric and magnetic properties of Nickel ferrite ceramics using crystalline powders derived from DL alanine fuel in sol–gel auto-combustion

Cation distribution and enhanced surface effects on the temperature-dependent magnetization of as-prepared NiFe2O4 nanoparticles

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