Influence of heat treatment on cobalt ferrite ceramic powders

Silva, Juliana B.; Brito, Walter de; Mohallem, Nelcy Della Santina

doi:10.1016/j.mseb.2004.05.029

Cited by 126 publications

(50 citation statements)

References 12 publications

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“…[10][11][12]15,19] or comparable [13,[16][17][18] with other reported methods. Moreover, this method does not require any corrosive reagent like NaOH and any elaborate experimental setup.…”

Section: Magnetic Measurementmentioning

confidence: 64%

“…We have reviewed several chemical synthesis methods used for the preparation of ferrites [8,9]. Synthesis routes are commonly used for CoFe 2 O 4 are co-precipitation [10][11][12][13][14], sol-gel [15,16], *Corresponding author. Email: naren70@yahoo.com precursors [17][18][19], reverse micelle [20], microemulsion [21], hydrothermal [22], etc.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterisation of pure single-phase CoFe₂O₄ nanopowder via a simple aqueous solution-based EDTA-precursor route

Rajput

Hazra

Ghosh

2012

Journal of Experimental Nanoscience

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Single-phase cobalt ferrite (CoFe 2 O 4 ) nanopowder, with average particle size �20 nm, has been synthesised using an ethylene diamine tetra acetic acid precursor-based method. CoFe 2 O 4 nanopowder was obtained by calcining precursor at 550 � C for 4 h in air. The change of microstructure of the synthesised CoFe 2 O 4 with increasing sintering temperature was studied using scanning electron microscopy. DC electrical resistivities of unsintered and sintered samples were measured using a two-probe method. Room temperature magnetic hysteresis measurement revealed that the synthesised CoFe 2 O 4 nanopowder exhibited ferromagnetic behaviour at room temperature with saturation magnetisation of 67.55 emu/g and coercivity of 1645.24 Oe.

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“…[10][11][12]15,19] or comparable [13,[16][17][18] with other reported methods. Moreover, this method does not require any corrosive reagent like NaOH and any elaborate experimental setup.…”

Section: Magnetic Measurementmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Synthesis and characterisation of pure single-phase CoFe₂O₄ nanopowder via a simple aqueous solution-based EDTA-precursor route

Rajput

Hazra

Ghosh

2012

Journal of Experimental Nanoscience

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“…Nevertheless, it has been shown that heat treatment can be used to control the magnetic properties of cobalt ferrite as desired. 8 It has also been shown that heat treatment can result in changes in exchange interaction between the tetrahedral and octahedral sites cations. 9 Hence heat treatment is useful for tailoring the magnetic and magnetostrictive properties.…”

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confidence: 99%

Temperature dependence of magnetic properties of heat treated cobalt ferrite

Nlebedim¹,

Melikhov²,

Jiles³

2014

Journal of Applied Physics

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This study demonstrates the effectiveness of heat treatment in optimizing the magneticproperties of cobalt ferrite, compared to other methods such as cation substitution. It also shows how the magnetic properties of the heat treated cobalt ferrite vary under differenttemperature conditions. Saturation magnetization increased more due to heat treatment than due to Zn-substitution; a cation substitution that is known to result in high saturationmagnetization in ferrites. A remarkable observation is that the increase in the saturationmagnetization due to heat treatment was not at the expense of Curie temperature as was often reported for cation substituted materials. The observed variations in the magnetic propertieswere explained on the basis of cation redistribution arising as a result of the heat treatment. KeywordsAmes Laboratory, Heat treatments, Ferrites, Cobalt, Saturation moments, Thermal properties Disciplines Electromagnetics and Photonics CommentsThe following article appeared in Journal of Applied Physics 115 (2014) This study demonstrates the effectiveness of heat treatment in optimizing the magnetic properties of cobalt ferrite, compared to other methods such as cation substitution. It also shows how the magnetic properties of the heat treated cobalt ferrite vary under different temperature conditions. Saturation magnetization increased more due to heat treatment than due to Zn-substitution; a cation substitution that is known to result in high saturation magnetization in ferrites. A remarkable observation is that the increase in the saturation magnetization due to heat treatment was not at the expense of Curie temperature as was often reported for cation substituted materials. The observed variations in the magnetic properties were explained on the basis of cation redistribution arising as a result of the heat treatment. V C 2014 AIP Publishing LLC. [http://dx

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“…We can infer from this that the 15 The magnetic properties of both strongly depend on cobalt and iron content, particle size, preparation method and particle shape. [16][17][18] The remanent magnetizations of CoFe 2 O 4 and Co 2 FeO 4 lie between 25 and 60 emu/g and 18-24 emu/g respectively, 19,20 and can reach 120 emu/cm 3 for CoFe 2 O 4 thin films. 21 Depending on the grain size, magnetic Curie temperature ranges of 520 C-557 C and 187 C have been identified for CoFe 2 O 4 and Co 2 FeO 4 , respectively.…”

Section: Discussionmentioning

confidence: 99%

Crystallographic and magnetic identification of secondary phase in orientated Bi5Fe0.5Co0.5Ti3O15 ceramics

Palizdar

Comyn

Ward

et al. 2012

Journal of Applied Physics

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Type of publicationArticle (peer-reviewed) The fabrication of highly-oriented polycrystalline ceramics of Bi 5 Fe 0.5 Co 0.5 Ti 3 O 15 , prepared via molten salt synthesis and uniaxial pressing of high aspect ratio platelets is reported. Electron backscatter images show a secondary phase within the ceramic which is rich in cobalt and iron. The concentration of the secondary phase obtained from scanning electron microscopy is estimated at less than 2% by volume, below the detection limit of x-ray diffraction (XRD). The samples were characterized by x-ray diffraction, polarization-electric field measurements, superconducting quantum interference device as a function of sample orientation and vibrating sample magnetometry as a function of temperature. It is inferred from the data that the observed ferromagnetic response is dominated by the secondary phase. This work highlights the importance of rigorous materials characterisation in the study of multiferroics as small amounts of secondary phase, below the limit of XRD, can lead to false conclusions. V C 2012 American Institute of Physics.[http://dx

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Influence of heat treatment on cobalt ferrite ceramic powders

Cited by 126 publications

References 12 publications

Synthesis and characterisation of pure single-phase CoFe₂O₄ nanopowder via a simple aqueous solution-based EDTA-precursor route

Synthesis and characterisation of pure single-phase CoFe₂O₄ nanopowder via a simple aqueous solution-based EDTA-precursor route

Temperature dependence of magnetic properties of heat treated cobalt ferrite

Crystallographic and magnetic identification of secondary phase in orientated Bi5Fe0.5Co0.5Ti3O15 ceramics

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Influence of heat treatment on cobalt ferrite ceramic powders

Cited by 126 publications

References 12 publications

Synthesis and characterisation of pure single-phase CoFe2O4 nanopowder via a simple aqueous solution-based EDTA-precursor route

Synthesis and characterisation of pure single-phase CoFe2O4 nanopowder via a simple aqueous solution-based EDTA-precursor route

Temperature dependence of magnetic properties of heat treated cobalt ferrite

Crystallographic and magnetic identification of secondary phase in orientated Bi5Fe0.5Co0.5Ti3O15 ceramics

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Product

Resources

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Synthesis and characterisation of pure single-phase CoFe₂O₄ nanopowder via a simple aqueous solution-based EDTA-precursor route

Synthesis and characterisation of pure single-phase CoFe₂O₄ nanopowder via a simple aqueous solution-based EDTA-precursor route