Magnetic properties of CoFe2O4 powders and thin films grown by a sol-gel method

Lee, Jae-Gwang; Lee, Hi Min; Kim, Chul Sung; Oh, Young Joo

doi:10.1016/s0304-8853(97)00925-6

Cited by 63 publications

(17 citation statements)

References 4 publications

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“…Addition of zinc also affects the lattice parameter (a 0 ). Various preparation techniques, such as sol-gel pyrolysis method 12 hydrothermal technique 13 and mechanical alloying 14 has been used to prepare ferrite nanoparticles. But coprecipitation method is considered to be an economical way of producing fine particles 15,16. The physical properties of nanoparticles are of current interest due to the size-dependent behavior observed in the nanometer length scale and high crystallinity.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of nickel zinc iron nanoparticles by coprecipitation technique

2010

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Nanoparticles nickel ferrite of size 6 -8 nm, synthesized by the coprecipitation method with x varying from 0 to 1.0. The powder samples were characterized by XRD, VSM and FTIR. The average crystallite sizes of the particles were determined from X-ray diffraction. X-ray analysis showed that the samples were cubic spinel. The lattice constant (a o ) increased with the increase in zinc substitution. The specific saturation magnetization (M S ) of the particles was measured at room temperature. The magnetic parameter of M S , was found to decrease with the increase in zinc substitution. Fourier transform infrared spectroscopy (FTIR) spectra of the Ni 1-x Zn x Fe 2 O 4 with x = 0, 0.5, 1 in the range 400 -4000 cm -1 were reported. The spinel structure and the crystalline water adsorption of Ni 1-x Zn x Fe 2 O 4 nanoparticles were studied by using FTIR.

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Section: Introductionmentioning

confidence: 99%

Synthesis of nickel zinc iron nanoparticles by coprecipitation technique

2010

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“…Thus, there is a need to understand the thermal history of sample. Various methods such as co-precipitation [3], sol-gel [4], hydrothermal technique [5], mechanical alloying [6,7] and combustion [8] have been developed for synthesis of nanosized metal ferrites. Among these methods, co-precipitation approach is an economical and promising ways in the production of fine particles [9].…”

Section: Introductionmentioning

confidence: 99%

Mössbauer and magnetic studies on nanocrystalline NiFe2O4 particles prepared by ethylene glycol route

Umare

Ningthoujam

Sharma³

et al. 2008

Hyperfine Interact

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NiFe 2 O 4 nanoparticles have been synthesized by co-precipitation method at 145 • C in N 2 atmosphere using ethylene glycol as solvent and capping agent. This gives the promising synthesis route for nanoparticles at low temperature. The as-synthesized NiFe 2 O 4 is subsequently heated at 400 • C, 500 • C, 700 • C and 800 • C. Crystallite size increases with the heat treatment temperature. The heat treatment temperature has direct effect on the electron paramagnetic resonance and intrinsic magnetic properties. The room temperature Mössbauer spectrum of the 800 • C heated sample shows the two sextets pattern indicating that the sample is ferrimagnetic and Fe 3+ ions occupy both tetrahedral and octahedral sites of spinel structure.

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“…For instance, coercivity is known to be maximal for a cobalt ferrite crystallite size between 30 and 40 nm. [1][2][3][4][5][6][7] More generally, nanostructured ceramic materials for both electronic and biomedical applications draw industry and scientist attention because of their physical properties depending on grain size. 8 Consequently, synthesis methods of nanometric powders are very attractive.…”

Section: Introductionmentioning

confidence: 99%