Influence of pH on structural morphology and magnetic properties of ordered phase cobalt doped lithium ferrites nanoparticles synthesized by sol–gel method

Srivastava, Manish; Ojha, Animesh K.; Chaubey, S.; Sharma, Prashant K.; Pandey, Avinash C.

doi:10.1016/j.mseb.2010.06.005

Cited by 90 publications

(18 citation statements)

References 25 publications

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“…In fact, the change in magnetic behavior of the NPs arises from the antagonism between size and shape anisotropy of the NPs. 50 The value of H c is increased consistently with increasing the particle size from 8.5 to 15.4 nm. It may be due to the enhanced anisotropy caused by the increased crystallinity at higher calcination temperatures.…”

Section: Magnetic Propertiesmentioning

confidence: 79%

“…The values of the magnetic parameters such as the saturation magnetization (M s ), the remanent magnetization (M r ) and the coercivity (H c ) for the CeO 2 NPs of particle size 8.5 ± 1.0, 11.4 ± 1.0 and 15.4 ± 1.0 nm were calculated using the hysteresis curves of the respective size and the results are presented in Table II. The values of the anisotropy constant (K) and magneton number (n B ) have also been calculated for the CeO 2 NPs using the Eq (5) and Eq (6), respectively 50 and values thus obtained are also given in Table II.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

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Controlled synthesis and magnetic properties of monodispersed ceria nanoparticles

et al. 2015

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In the present study, monodispersed CeO2 nanoparticles (NPs) of size 8.5 ± 1.0, 11.4 ± 1.0 and 15.4 ± 1.0 nm were synthesized using the sol-gel method. Size-dependent structural, optical and magnetic properties of as-prepared samples were investigated by X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), high resolution transmission electron microscopy (HR-TEM), ultra-violet visible (UV-VIS) spectroscopy, Raman spectroscopy and vibrating sample magnetometer (VSM) measurements. The value of optical band gap is calculated for each particle size. The decrease in the value of optical band gap with increase of particle size may be attributed to the quantum confinement, which causes to produce localized states created by the oxygen vacancies due to the conversion of Ce4+ into Ce3+ at higher calcination temperature. The Raman spectra showed a peak at ∼461 cm-1 for the particle size 8.5 nm, which is attributed to the 1LO phonon mode. The shift in the Raman peak could be due to lattice strain developed due to variation in particle size. Weak ferromagnetism at room temperature is observed for each particle size. The values of saturation magnetization (Ms), coercivity (Hc) and retentivity (Mr) are increased with increase of particle size. The increase of Ms and Mr for larger particle size may be explained by increase of density of oxygen vacancies at higher calcination temperature. The latter causes high concentrations of Ce3+ ions activate more coupling between the individual magnetic moments of the Ce ions, leading to an increase of Ms value with the particle size. Moreover, the oxygen vacancies may also produce magnetic moment by polarizing spins of f electrons of cerium (Ce) ions located around oxygen vacancies, which causes ferromagnetism in pure CeO2 samples.

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Section: Magnetic Propertiesmentioning

confidence: 79%

Section: Magnetic Propertiesmentioning

confidence: 99%

Controlled synthesis and magnetic properties of monodispersed ceria nanoparticles

et al. 2015

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“…It was mixed quickly into the ionic solution during stirring on a hot plate heater to form uniform precipitates. For phase-purity and desired crystallite size, a value of pH = 12 was maintained at 30 • C [15]. After vigorous stirring for 30 min, the temperature of the solution was raised to 80 ± 2 • C and kept it for 45 min to transform hydroxides into ferrite.…”

Section: Synthesis Of Bifeo3mentioning

confidence: 99%

Phase pure synthesis of BiFeO3 nanopowders using diverse precursor via co-precipitation method

Shami

Awan

Anis-ur-Rehman

2011

Journal of Alloys and Compounds

108

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“…Many techniques have already been employed in the development of cobalt ferrite nanoparticles including a novel solvothermal approach [7], microemulsions [8], a new nonaqueous route [9], a chemical co-precipitation method [10] and the sol-gel technique [11].…”

Section: Introductionmentioning

confidence: 99%

Developments of cobalt ferrite nanoparticles prepared by the sol–gel process

Sajjia

Oubaha

Hasanuzzaman

et al. 2014

Ceramics International

149

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In the phase of the study reported, the sol-gel technique was followed in the preparation of cobalt ferrite amorphous powder following the same procedure which was selected as the best approach as described in a previous study. It was assumed that there must be a correlation between the heat treatment operational parameters and the structural properties of the material being synthesized. Similarly, it was understood that some heat treatment is necessary to completely decompose the organic and nitrate contents present in the amorphous powder. Having ensured that the heat treatment parameters could be changed without producing a material with poorer properties, it was then possible to produce batches of powders using milder conditions in the heat treatment operation. The particle size distributions of these new batches of nanoparticles were estimated to be in the range 7-28 nm and since the results showed promise, their magnetic properties were also determined.

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Influence of pH on structural morphology and magnetic properties of ordered phase cobalt doped lithium ferrites nanoparticles synthesized by sol–gel method

Cited by 90 publications

References 25 publications

Controlled synthesis and magnetic properties of monodispersed ceria nanoparticles

Controlled synthesis and magnetic properties of monodispersed ceria nanoparticles

Phase pure synthesis of BiFeO3 nanopowders using diverse precursor via co-precipitation method

Developments of cobalt ferrite nanoparticles prepared by the sol–gel process

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