Synthesis of nanosized MgFe2O4 powders by microwave hydrothermal method

Verma, Seema; Joy, P.A.; Khollam, Y. B.; Potdar, H.S.; Deshpande, S. B.

doi:10.1016/j.matlet.2003.08.025

Cited by 183 publications

(79 citation statements)

References 22 publications

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“…8 Literature contains several physical as well as chemical method to synthesize the spinel ferrites like solid-state reaction, 9 high energy ball milling, 10 sol-gel, 11 hydrothermal synthesis, 12 chemicalcoprecipitation, 13 combustion synthesis, 14 micro-emulsion 15 and microwave hydrothermal. 16 The structural, transport and magnetic properties of the CoFe 2 O 4 are strongly dependent on the synthesis method, crystallite size etc. 17 The ferromagnetic behavior of the cobalt ferrite is observed with transition temperature around 790K which crystallize in the Co 1−δ Fe δ O 4 tetrahedral A-site coordination and Co δ Fe 1−δ O 4 octahedral B-site coordination where, δ-represents the degree of inversion and when δ = 1, the inverse spinel structure is formed and when δ = 0, the normal spinel structure is possible which is observed in the mixed spinel structure.…”

Section: Introductionmentioning

confidence: 99%

Structural, dielectric and magnetic properties of nickel substituted cobalt ferrite nanoparticles: Effect of nickel concentration

et al. 2015

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Microstructure and magnetic properties of MFe 2 O 4 (M = Co, Ni, and Mn) ferrite nanocrystals prepared using colloid mill and hydrothermal method Journal of Applied Physics 117, 17A328 (2015) Nickel substituted cobalt ferrite nanoparticles with composition Co 1−x Ni x Fe 2 O 4 (0.0≤x≤1.0) was synthesized using simple, low temperature auto combustion method. The X-ray diffraction patterns reveal the formation of cubic phase spinel structure. The crystallite size varies from 30-44 nm with the nickel content. Porous and agglomerated morphology of the bulk sample was displayed in the scanning electron microscopy. Micro Raman spectroscopy reveals continuous shift of E g and E g (2) stokes line up to 0.8 Ni substitution. The dispersion behavior of the dielectric constant with frequency and the semicircle nature of the impedance spectra show the cobalt nickel ferrite to have high resistance. The ferromagnetic nature is observed in all the samples, however, the maximum saturation magnetization was achieved by the 0.4 Ni substituted cobalt ferrite, which is up to the 92.87 emu/gm at 30K. C 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License. [http://dx

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Section: Introductionmentioning

confidence: 99%

Structural, dielectric and magnetic properties of nickel substituted cobalt ferrite nanoparticles: Effect of nickel concentration

et al. 2015

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“…Nano-sized magnetic ferrite particles exhibit unique properties, which enable their use in a wide range of applications such as high density recording, high frequency devices and magnetic refrigerators [1,2]. There are several methods for synthesising nano-sized spinel ferrites, such as co-precipitation, sol-gel, microemulsion, hydrothermal and reverse micelle method [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

A comparative study of structural, electrical and magnetic properties of magnesium ferrite nanoparticles synthesised by sol-gel and co-precipitation techniques

Thankachan¹,

Xavier²,

Jacob³

et al. 2013

Journal of Experimental Nanoscience

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A comparative study of structural, electrical and magnetic properties of magnesium ferrite nanoparticles synthesised by sol-gel and co-precipitation techniques, Journal of Experimental Nanoscience, 8:3, 347-357, DOI: 10.1080/17458080.2012 Nano-sized magnesium ferrite was synthesised using co-precipitation and sol-gel techniques. Structural characterisation was performed using X-ray diffractometer (XRD), Fourier transform infrared (FTIR) spectrometer and scanning electron microscope. XRD analysis reveals the prepared samples are single phasic without any impurity. Particle size calculation shows that the crystallite size of sol-gel prepared samples is 9 nm and co-precipitation sample is 11 nm. FTIR analysis confirmed spinel structure of the prepared samples. Magnetic measurements show that both the samples are ferromagnetic with a high degree of isotropy in co-precipitation derived sample. The frequency dependence of the dielectric constant in the range 100 Hz-20 MHz was also investigated in the temperature range 303-533 K. The results of both the samples followed Maxwell-Wagner model based on interfacial polarisation in consonance with Koops theory.Keywords: nano-structured materials; magnesium ferrite; sol-gel technique; co-precipitation; magnetic measurement; dielectric properties IntroductionDiverse practical applications of spinel ferrites of the type MFe 2 O 4 has attracted the attention of researchers for decades. Nano-sized magnetic ferrite particles exhibit unique properties, which enable their use in a wide range of applications such as high density recording, high frequency devices and magnetic refrigerators [1,2]. There are several methods for synthesising nano-sized spinel ferrites, such as co-precipitation, sol-gel, microemulsion, hydrothermal and reverse micelle method [3][4][5]. Magnesium ferrite is a typical spinel in which the cation distribution in the crystal lattice site is sensitive to heat treatment due to high diffusibility of Mg 2þ ions [6,7]. Magnesium ferrites are used as humidity sensors [8], catalysts [9] and also in magnetic and gas sensing applications [10,11]. When its crystallite size is below a certain value, MgFe 2 O 4 possesses unique superparamagnetic properties at room temperature and has promising potential for applications in transformers, ferrofluids and magnet cores of coils [12,13].

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“…The sample prepared at 100˚C shows the greater values of lattice parameter as compared to the samples prepared at 125˚C and 150˚C. 4 June 2014 | Volume 1 | e697 The value of lattice parameter increases with increase in reaction temperature. This can be attributed to the chemical kinematics [24].…”

Section: Lattice Parametermentioning

confidence: 95%

“…The microwave synthesis is fundamentally different from the conventional synthesis in terms of its heating mechanism. In a microwave oven, heat is generated within the sample volume itself by the interaction of microwaves with the material [4]- [6]. Several studies have been reported on substituted lithium ferrites synthesized using different technique [7]- [9] therefore an attempt has been made in the present communication to report the structural properties of Zn substituted Li-Cu ferrite synthesized using microwave induced combustion synthesis route.…”

Section: Introductionmentioning

confidence: 98%

Structural Analysis and Normalised Susceptibility Study of Zn Substituted Li-Cu Ferrite

Khot¹,

Shinde²,

Basavaiah³

et al. 2014

OALib

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Lithium ferrites have attracted considerable attention because they have been used as replacements for garnets due to their low cost. A series of polycrystalline ferrite samples with the composition of Li x Zn 0.6−2x Cu 0.4 Fe 2 O 4 (x = 0.05, 0.1, 0.15, 0.2, 0.25, 0.3) at different chemical reaction temperature (100˚C, 125˚C and 150˚C) were prepared using non-conventional microwave sintering method. The characterization was carried out using X-rays technique. The X-ray analysis confirms the formation of single phase cubic structure. The lattice parameter ranges from 8.3690 Å to 8.4653 Å. The X-ray density shows the variation as a function of temperature of synthesis. The variation of AC susceptibility with temperature shows the existence of single domain structure for x ≥ 0.2 when the chemical reaction carried at 125˚C and 150˚C and exhibits super paramagnetic structure for all the composition prepared at 100˚C. The samples x ≤ 0.2 shows multidomain structure for all the samples prepared at 125˚C and 150˚C. The Curie temperature obtained using the susceptibility data are found to be in the range 350˚C to 700˚C. An attempt has been made to synthesis the nanoparticles at lower reaction temperature by using non-conventional microwave sintering method.

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Synthesis of nanosized MgFe2O4 powders by microwave hydrothermal method

Cited by 183 publications

References 22 publications

Structural, dielectric and magnetic properties of nickel substituted cobalt ferrite nanoparticles: Effect of nickel concentration

Structural, dielectric and magnetic properties of nickel substituted cobalt ferrite nanoparticles: Effect of nickel concentration

A comparative study of structural, electrical and magnetic properties of magnesium ferrite nanoparticles synthesised by sol-gel and co-precipitation techniques

Structural Analysis and Normalised Susceptibility Study of Zn Substituted Li-Cu Ferrite

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