Effect of sintering temperature and the particle size on the structural and magnetic properties of nanocrystalline Li0.5Fe2.5O4

Shirsath, Sagar E.; Kadam, R.H.; Gaikwad, Anil S.; Ghasemi, Ali; Morisako, Akimitsu

doi:10.1016/j.jmmm.2011.06.065

Cited by 139 publications

(35 citation statements)

References 32 publications

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“…The increase in saturation magnetization with increasing the annealing temperature may be due to pure phase formation of lithium ferrite and the reduction of defects in the annealed powders. Similar results have been reported in literature for Li-ferrite prepared by sol-gel auto-ignition method (Shirsath et al 2011). Fig.…”

Section: Magnetic Propertiessupporting

confidence: 91%

“…Recently, Li 0.5 Fe 2.5 O 4 nanoparticles have been developed via several techniques like sol-gel auto-ignition (Shirsath et al 2011), oxalate precursor (Hessien 2008), Flash combustion and Citrate precursor (Verma et al 2009). However, no reports have been found so far in the literature describing the preparation of nanocrystalline lithium ferrite by milling process.…”

Section: Introductionmentioning

confidence: 99%

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Structural, magnetic and electrical properties of the lithium ferrite obtained by ball milling and heat treatment

Mazen

Abu-Elsaad

2014

Appl Nanosci

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The physical properties of ferrites are very sensitive to microstructure, which in turn critically depends on the manufacturing process. Lithium ferrite is synthesized by milling process. The powder was annealed at four different temperatures 600, 800, 1,000 and 1,200°C. The powder annealed at 600°C has the spinel structure with some of a-Fe 2 O 3 , while the powders annealed at C800°C formed in single-phase cubic spinel structure. Particle size of lithium ferrite is in the range of 26-70 nm, and is dependent on the annealing temperature. The saturation magnetization increased from 22 to 85 emu/g and the coercivity decreases from 124 to 4 Oe with increase in the annealing temperature. The dielectric constant (e'), dielectric loss (tan d) and ac conductivity (r ac ) were measured at room temperature as a function of frequency. The results of dielectric properties were explained in terms of Koops phenomenological theory.

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Section: Magnetic Propertiessupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Structural, magnetic and electrical properties of the lithium ferrite obtained by ball milling and heat treatment

Mazen

Abu-Elsaad

2014

Appl Nanosci

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“…The prepared powders of all the samples were annealed at 450°C for 4 h to obtain the final product. The detailed synthesis process was discussed in our earlier publications [3,4]. X-ray diffraction patterns of the samples were examined using a Philips X-ray diffractometer (model 3710; PANalytical B.V., Almelo, The Netherlands) with CuKα radiation (λ = 1.5405 Å).…”

Section: Methodsmentioning

confidence: 99%

Influence of Cr3+ substitution on the electrical and magnetic properties of Ni0.4Cu0.4Zn0.2Fe2O4 nanoparticles

Kadam¹,

Karim

Kadam³

et al. 2012

Int Nano Lett

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The Ni 0.4 Cu 0.2 Zn 0.4 ferrites with different concentrations of Cr 3+ were synthesized at a low temperature (450°C) using sol-gel auto-combustion method. The X-ray diffraction analysis of the samples confirms the formation of a single-phase cubic spinel structure. The lattice constant decreases from 8.331 to 8.253 Å with an increase in Cr 3+ substitution. Bulk density decreases from 4.95 to 4.71 gm/cm 3 whereas porosity increases from 9.34% to 14.76% with an increase in Cr 3+ substitution. Transmission electron microscopy was adopted to determine the particle size. Particle size decreases from 19 to 13 nm with the addition of Cr 3+ ions. Saturation magnetization, coercivity, and other hysteresis parameters were measured using a vibrating sample magnetometer at room temperature with a maximum magnetic field of 8 kOe. Magnetization decreases from 62 to 48 emu/g, whereas coercivity increases from 65 to 180 Oe. The direct current (DC) resistivity increases from 3.62 × 10 6 to 4.21 × 10 6 Ω cm with Cr 3+ content x. The dielectric constant (ε 0 ) decreases with increasing concentration of Cr 3+ ions.

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“…The important driving forces for the mechanism in general are: excess free energy in a grain boundary which makes the grain to minimize its local surface area, and the volume free energy difference between the neighboring grains on either side of a grain boundary [51]. Shirsath et al [52] correlated the increasing particle size with increasing sintering temperature to the coalescence that increases as sintering temperature increases. According to the phenomenological kinetic grain growth equation, the increase in sintering temperature increases the grain size [53].…”

Section: 2 Grain Size Measurementsmentioning

confidence: 99%

Effect of sintering temperature on microstructure and electrical properties of Sr1−x(Na0.5Bi0.5) x Bi2Nb2O9 solid solutions

Naceur¹,

Megriche²,

Maaoui³

2014

J Adv Ceram

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Abstract:In this study, we investigated the effect of sintering temperature on densification, grain size, conductivity and dielectric properties of Sr 1 x (Na 0.5 Bi 0.5 ) x Bi 2 Nb 2 O 9 ceramics, prepared by hydrothermal method. Pellets were sintered at different temperatures. Density increased with sintering temperature, reaching up to 96% at 800 . A grain growth was observed with increasing sintering temperature. Impedance spectroscopy analyses of the sintered samples at various temperatures were performed. Increase in dielectric constant and in Curie temperature with sintering was discussed. Electrical conductivity and activation energy were calculated and attributed to the microstructural factors.

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Effect of sintering temperature and the particle size on the structural and magnetic properties of nanocrystalline Li0.5Fe2.5O4

Cited by 139 publications

References 32 publications

Structural, magnetic and electrical properties of the lithium ferrite obtained by ball milling and heat treatment

Structural, magnetic and electrical properties of the lithium ferrite obtained by ball milling and heat treatment

Influence of Cr3+ substitution on the electrical and magnetic properties of Ni0.4Cu0.4Zn0.2Fe2O4 nanoparticles

Effect of sintering temperature on microstructure and electrical properties of Sr1−x(Na0.5Bi0.5) x Bi2Nb2O9 solid solutions

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