Structural and magnetic properties of Co1−xMnxFe2O4 (0≤x≤0.4) spinel ferrites synthesized by combustion route

Kambale, Rahul C.; Shaikh, Parvez A.; Harale, N.S.; Bilur, V.A.; Kolekar, Y. D.; Bhosale, C.H.; Rajpure, K.Y.

doi:10.1016/j.jallcom.2009.10.082

Cited by 110 publications

(40 citation statements)

References 25 publications

(24 reference statements)

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“…Figure 11 shows (Table 3); this can be attributed to the magnetic character and the anisotropic nature of cobalt substituted by manganese. The obtained result shows that the value of M s is lower (55.16 ± 24 emu/g) for pure CoFe 2 O 4 , and it is increased from 57.75 ± 31 to 66.92 ± 05 emu/g with increase of the concentration of Mn 2+ (x = 0.1 to 0.5), which can be attributed to the smaller magnetic moments of Co 2+ ions (3 μB) substituted by the higher magnetic moments of Mn 2+ ions (5 μB) at the octahedral sites [43][44][45]. From the M-H loop, it can be observed that the spinel Mn 0.5 Co 0.5 Fe 2 O 4 nanoparticles show high saturation magnetization (M s ) justified by the high anisotropy and small dimensions of the grains.…”

Section: Photoluminescence Spectroscopymentioning

confidence: 93%

Role of Mn2+ Doping on Structural, Morphological, and Opto-Magnetic Properties of Spinel Mn x Co1−x Fe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) Nanocatalysts

Manikandan

Durka²,

Antony

2015

J Supercond Nov Magn

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Spinel Mn x Co 1−x Fe 2 O 4 ; x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) nanoparticles were synthesized by ureaassisted auto combustion method using nitrates of Co, Mn and Fe as the starting materials and urea as the fuel. X-ray diffraction (XRD) analysis showed that all composition was found to have a cubic spinel structure. The average crystallite size of the samples was estimated using the Debye-Scherrer formula and was found to be in the range of 22.62 and 36.45 nm. The lattice parameter increased from 8.432 to 8.457Å with increasing the Mn 2+ content, which was determined by Rietveld analysis. High-resolution scanning electron microscopy (HR-SEM) and high-resolution transmission electron microscopy (HR-TEM) analyses were used to study the morphological variation, and the results showed a nanosized particlelike morphology. Energy-dispersive X-ray (EDX) results showed that the composition of the elements was relevant as expected from the synthesis. The bandgap energy of the pure CoFe 2 O 4 was estimated to be 2.33 eV from UV-visible diffuse reflectance spectroscopy (DRS). With the increase of Mn 2+ ion, the bandgap energy increased from 2.35 to 2.42 eV. The magnetic properties of the A. Manikandan ( ) · S. samples were investigated at room temperature by using a vibrating sample magnetometer (VSM). The magnetic hysteresis (M-H) loop confirmed the superparamagnetic nature of pure CoFe 2 O 4 and a weak ferromagnetic behavior of Mn 2+ doped CoFe 2 O 4 samples with specific saturation magnetization in the range of 55.16 ± 24 and 66.92 ± 05 emu/g. All compositions of spinel Mn x Co 1−x Fe 2 O 4 samples were successfully tested as catalyst for the conversion of benzyl alcohol, which has resulted in 62.75 and 92.62 % conversion efficiency of CoFe 2 O 4 and Mn 0.5 Co 0.5 Fe 2 O 4 , respectively.

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Section: Photoluminescence Spectroscopymentioning

confidence: 93%

Role of Mn2+ Doping on Structural, Morphological, and Opto-Magnetic Properties of Spinel Mn x Co1−x Fe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) Nanocatalysts

Manikandan

Durka²,

Antony

2015

J Supercond Nov Magn

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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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“…The peaks are characteristic of pure cubic spinel structure confirming single-phase formation of the synthesized compound. The sample has a cubic inverse spinel structure with a lattice parameter of 8.359 ± 0.001 Å, which similar to that of similar compounds [1]. The grain size of 8.06 ± 0.01 nm was calculated from the most intense (311) XRD peak using the Debye-Scherer formula.…”

Section: Resultsmentioning

confidence: 83%

“…The properties also depend on the synthesis methods and the nanosize nature of the compounds. Mn-Co ferrites have application as stress sensors due to their large magneto-mechanical effect and high sensitivity to stress [1]. Efforts continue to find the best substitutions to improve the properties.…”

Section: Introductionmentioning

confidence: 99%

Mössbauer and magnetic studies of Mn0.1Sr0.2Co0.7Fe2O4 nanoferrite

et al. 2011

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The magnetic properties of Mn 0.1 Sr 0.2 Co 0.7 Fe 2 O 4 nanoferrite with particle size of about 8 nm were investigated using magnetization and Mössbauer spectroscopy measurements. The sample shows a large increase in coercive field from 0.045 kOe at room temperature to about 3.00 kOe at 4 K. Room temperature coercive fields increased with increase in the annealing temperature between 300 • C and 800 • C. Our results show evidence of transformation from single domain to multidomain structure with thermal annealing.

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Structural and magnetic properties of Co1−xMnxFe2O4 (0≤x≤0.4) spinel ferrites synthesized by combustion route

Cited by 110 publications

References 25 publications

Role of Mn2+ Doping on Structural, Morphological, and Opto-Magnetic Properties of Spinel Mn x Co1−x Fe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) Nanocatalysts

Role of Mn2+ Doping on Structural, Morphological, and Opto-Magnetic Properties of Spinel Mn x Co1−x Fe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) Nanocatalysts

Triethylene Glycol Stabilized CoFe2O4 Nanoparticles

Mössbauer and magnetic studies of Mn0.1Sr0.2Co0.7Fe2O4 nanoferrite

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