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Rao, B. Bhaskara; Rao, K. H.

doi:10.1023/a:1018683615616

Cited by 133 publications

(40 citation statements)

References 14 publications

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“…In Ni-Zn ferrites, on the other hand, an increase in the sintering temperature leads to a decrease in the resistivity due to the higher Fe 2+ concentration, allowing hopping conductivity mechanisms to occur 15,16 . Several investigations on the structure, conductivity and magnetic properties of Ni-modified ferrites have been reported in literature [13][14][15][16] . Most reports, however, describe the obtaining and characterization of nanoparticles through several processing routes 14,[17][18][19][20] .This paper investigates the effect of the sintering temperature of Ni-ferrite bulk ceramics upon microstructural evolution, and evaluates its relation with electric and magnetic properties as well.…”

Section: +mentioning

confidence: 99%

“…In these systems, the high conversion energy coefficient between electric and magnetic fields (ME effect) is directly dependent on the high electric resistivity, high saturation magnetization (Ms) and high magnetostrictive coefficient of the magnetic phase, as well as the chemical stability of the magnetic phases 8,9 . Me-ferrites in polycrystalline form may be obtained by several preparation methods, such as solid state reaction, co-precipitation, mechano-chemical, combustion, or sol-gel [10][11][12][13] . However, variations in synthesis conditions such as sintering time, temperature, atmosphere and thermal annealing will influence final composition and grain size 13,14 .…”

Section: Introductionmentioning

confidence: 99%

“…Me-ferrites in polycrystalline form may be obtained by several preparation methods, such as solid state reaction, co-precipitation, mechano-chemical, combustion, or sol-gel [10][11][12][13] . However, variations in synthesis conditions such as sintering time, temperature, atmosphere and thermal annealing will influence final composition and grain size 13,14 . One of the most important members of Me-Ferrite systems is the nickel ferrite, or NiFe 2 O 4 , which is a soft magnetic material with an inverse spinel structure.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the sintering temperature on the magnetic and electric properties of NiFe2O4 ferrites

et al. 2012

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This study evaluates the structural, microstructural, electric and magnetic properties of nickel ferrite samples prepared through the solid state reaction. It was observed that an increase in the sintering temperature produces a higher cation concentration in the A site when compared to the B site. The assessment of magnetic properties showed that an increase in grain size leads to a decrease in the coercive fields verging on superparamagnetic values, while the saturation magnetization increases up to 46.5 Am 2 .kg -1 for samples sintered at 1200 °C. The dc electric resistivity behavior of samples was attributed to the increase in the cross-sectional area of grains as well as the different oxidation states and distribution of cations amongst the lattice sites of the spinel structure.

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Section: +mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of the sintering temperature on the magnetic and electric properties of NiFe2O4 ferrites

et al. 2012

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“…In this study, NiFe 2 O 4 samples were prepared via the sol-gel technique and sintered at different sintering temperatures [2]. The effects of the sintering conditions on the dielectric properties of nickel ferrites were investigated.…”

Section: Introductionmentioning

confidence: 99%

Dielectric permittivity of nickel ferrites at microwave frequencies 1 MHz to 1.8 GHz

Hassan

Yen

Hashim

et al. 2007

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NiFe 2 O 4 prepared via the sol-gel technique were pre-sintered at 900°C and synthesized at different sintering temperatures from 1,000°C to 1,200°C at 100°C intervals. The samples were characterized for microwave dielectric properties. These samples were measured using Agilent Impedance/Material Analyzer at frequencies 1 MHz to 1.8 GHz. Results showed a decrease in the dielectric constant and loss factor with frequency except at the turning point, around 150 MHz, where the loss factor showed a gradual increase. However, both the dielectric constant and loss factor increase with increasing sintering temperature. The grain size and density also increased with increasing sintering temperature, but the porosity and grain boundary density showed a decrease.

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“…5 shows the complex permittivity spectra of the NiCuZn and MgCuZn samples sintered at 900 • C. There are no notable differences between these two ferrite samples. It is known that the permittivity values of the spinel ferrites are mainly determined by their electronic exchange such as Fe 2+ ⇔ Fe 3+ and grain to grain boundary thickness ratio [11]. Due to little difference on the microstructures between the two kinds of samples, the difference of grain to grain boundary thickness ratio can be ignored.…”

Section: Methodsmentioning

confidence: 99%