Preparation and characterization of nanocrystalline disordered lithium ferrite by citrate precursor method

Dey, Sayan; Roy, Abhijit; Das, Diptasikha; Ghose, J.

doi:10.1016/j.jmmm.2003.08.024

Cited by 75 publications

(49 citation statements)

References 24 publications

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“…Recently there has been a growing interest in the production and study of nanosized ferrites due to their potential applications and fundamental understanding of properties of materials when the particle size approaches the nanometer scale. For example nanocrystalline materials are already being used in contrast enhancement of magnetic resonance imaging, high-density data storage and as magnetic carriers for selective extraction of biological components or delivery of drugs to specific parts of the body [6].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and magnetic properties of Cu0.5Ni0.5Fe2O4 nanoparticles produced by glycothermal and hydrothermal processes

Msomi

Moyo

2009

Hyperfine Interact

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Cu 0.5 Ni 0.5 Fe 2 O 4 nanoparticles have been synthesized in ethylene glycol solution and in deionised water. The glycothermal reaction was carried at 200 • C under gauge pressure of 100 psi. The hydrothermal treatment was done at 100 • C under zero pressure. Complete single-phase cubic spinel structure in the samples made by glycothermal (sample G) and hydrothermal (sample H) processes formed after annealing at 600 • C and 900 • C respectively. The coercive field of sample H increases from 72 Oe to 133 Oe after sintering at 700 • C and then decrease to 11 Oe on sintering at 1000 • C. This variation is attributed to surface effects and crossover from single to multidomain behavior due to increasing particle size.

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Section: Introductionmentioning

confidence: 99%

Synthesis and magnetic properties of Cu0.5Ni0.5Fe2O4 nanoparticles produced by glycothermal and hydrothermal processes

Msomi

Moyo

2009

Hyperfine Interact

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“…The grains are found to be prevalently of spherical shape. The observed trend of coagulation (of particles) with doping (x) is attributed [55] to the growth of the nanophased structure.…”

Section: Sem Studymentioning

confidence: 92%

Experimental characterization of nanocrystalline niobium-doped nickel–zinc ferrites: occurrence of superparamagnetism

Lakshmi¹,

Sridhar

Govindraj

et al. 2016

J Mater Sci

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Structural, morphological, magnetic, and dielectric investigations are carried out in Nb-doped (viz., for x equal to 0.0-0.4 by wt%) nanocrystalline Ni-Zn ferrites synthesized by hydrothermal method. XRD, IR studies infer the growth of nano structures and Fe 2 O 3 phase. Nb ions segregate at grain boundaries. Crystallite size (D) varies from 62 to 18 nm with x. FTIR absorption exhibits split at higher x. Saturation magnetization witnesses an overall decrease with x. Trends of M s (x) are explained by nature of dopant, preferential replacement, surface canting (Y-K angles) and lattice contraction. Variations of coercive field (H c ) and D infer singledomain to multi-domain morphological transformation. Occurrence of superparamagnetism (SPM) is predicted for zeroed values of H c and for a critical concentration x crit equal to 0.321. Enhanced Nb 5? -Fe 2? binding with dopant (x up to 0.2) results for decrease in dielectric constant e 0 r , loss factor tand and increase in resistivity q. Lowered ac conductivity is attributed to blockade of path by Nb 5? ions in the vicinity of B-sites. Relatively higher q (*10 8 X cm) and lower loss (tand *10 -2 -10 -3 ) evinced for 10 kHz. Enhanced core loss is realized with x manifested as lowered H c and tand to usher their utility in high-frequency applications.

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“…Where, the prominent bands at 3470 and 1625 cm −1 are ascribed to the stretching modes and H-O-H bending vibration of the free or absorbed water. This suggests that hydroxyl groups are retained in the ferrites when they are prepared [11][12][13]. The supplementary band appearing at 1120 cm −1 is a characteristic for the secondary OH group.…”

Section: Infrared Spectra Interpretationmentioning

confidence: 93%

Electrical and Dielectric Relaxation Characterization of Ni1−x Zn x Ga0.5Fe1.5O4

Hashhash

Kaiser

Ata‐Allah

2015

J Supercond Nov Magn

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The ferrite system, Ni 1−x Zn x Ga 0.5 Fe 1.5 O 4 (x ranges from 0.0 to 0.5 in steps of 0.1), has been synthesized by a solid-state reaction technique. Single-phase cubic spinel structure was confirmed with X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) results. The effect of introducing zinc in the unit cell on the electrical properties was investigated in the ranges 10 2 -10 5 Hz and 300-600 K of frequency and temperature, respectively. Semiconducting behavior over all studied ranges of frequency and temperature was observed. This behavior is attributed to the cation-anion-cation interaction, which is most predominant at B-sites in these samples. Variation of the universal exponents with temperature indicates the presence of a correlated barrier hopping (CBH) mechanism. The determined transition temperature T C was found to decrease with increasing the compositional parameter x.

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Preparation and characterization of nanocrystalline disordered lithium ferrite by citrate precursor method

Cited by 75 publications

References 24 publications

Synthesis and magnetic properties of Cu0.5Ni0.5Fe2O4 nanoparticles produced by glycothermal and hydrothermal processes

Synthesis and magnetic properties of Cu0.5Ni0.5Fe2O4 nanoparticles produced by glycothermal and hydrothermal processes

Experimental characterization of nanocrystalline niobium-doped nickel–zinc ferrites: occurrence of superparamagnetism

Electrical and Dielectric Relaxation Characterization of Ni1−x Zn x Ga0.5Fe1.5O4

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