Sol–gel derived nanoparticles of Zn substituted lithium ferrite (Li0.32Zn0.36Fe2.32O4): magnetic and Mössbauer effect measurements and their theoretical analysis

Sutradhar, Soumyaditya; Pati, Satya Prakash; Acharya, S.; Das, Sukhen; Das, Dipankar; Chakrabarti, P.K.

doi:10.1016/j.jmmm.2011.11.019

Cited by 41 publications

(22 citation statements)

References 32 publications

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“…However, the performance of nano-scale ferrites is also more sensitive to the effects of chemical composition, preparation methods, sintering temperature, and sintering time, etc [10,11]. There are multiple synthesis method to prepare the Li-Ni ferrite systems, such as hydrothermal, high temperature ceramic technique, co-precipitation, sol-gel etc [12][13][14][15][16]. In the above preparation methods, sol-gel auto-combustion method can prepare ultrafine crystalline powders exhibiting chemically homogeneous composition, uniform size and good reactivity.…”

Section: Introductionmentioning

confidence: 99%

Effect of heat treatment on structural and magnetic properties of Li–Ni ferrite prepared via sol–gel auto-combustion method

Song

Wang

Gao

2021

J Mater Sci: Mater Electron

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Nanocrystalline Li0.35Ni0.3Fe2.35O4 ferrites were prepared at different annealing temperature by sol-gel auto-combustion method. The effects of the annealing temperature on the structure and magnetic properties of the synthesized Li-Ni ferrites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectra (FT-IR) and Squid-VSM. Rietveld refinement of the X-ray diffraction data confirmed the occurrence of phase transition from α-spinel to β-spinel, from which the ideal cation occupation and lattice parameter can be obtained. The grain size increased significantly with annealing temperature. The variation of saturation magnetization can be well explained in terms of the occupation of ions in tetrahedron and octahedron. The coercivity initially increased and later decreased significantly from 115 to 37 Oe with the increase of annealed temperature which could be attributed the fact that the 600℃-annealed grain size is close to transition size from single to multidomain region.

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Section: Introductionmentioning

confidence: 99%

Effect of heat treatment on structural and magnetic properties of Li–Ni ferrite prepared via sol–gel auto-combustion method

Song

Wang

Gao

2021

J Mater Sci: Mater Electron

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“…Alkali metal ferrites find extensive use in microwave components due to their attractive electrical and magnetic properties [1][2][3][4][5][6][7][8][9][10][11]. Ferrites have been reported as better electromagnetic materials than pure metals because of their low cost, high resistivity and ease of preparation.…”

Section: Introductionmentioning

confidence: 99%

Effect of Zn dopant on Properties of Li ferrite Synthesized by Solution Combustion Method

Anu¹

2017

International Advanced Research Journal in Science, Engineering

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Herein, Urea assisted solution combustion method has been used for the preparation of stoichiometrically pure and Zn doped Li ferrites. Urea acts as a capping agent and helps in the formation of nanostructures. Solution combustion method helps easier formation of ferrites in a single step, at relatively lower temperature and in shorter time than the reported methods. Powder X-ray diffraction (XRD) studies with diffractometer indicate high purity, single phase spinel ferrites formation. Magnetic studies by vibratory sample magnetometer (VSM) reveal an increase in the magnitude of saturation magnetization with increasing Zn content up to x = 0.3. The Zn doped Li ferrite formed possess high dc-resistivity values which make them suitable for high-frequency applications. Apart from the academic interest involved, these investigations are of technological importance in the view of the fact that their end products (ferrites) play a key role as electro-magnetic materials in the modern industry.Keywords: Solution combustion method, powder X-ray diffraction, Powder X-ray diffraction, saturation magnetization, dc-resistivity. I INTRODUCTIONAlkali metal ferrites find extensive use in microwave components due to their attractive electrical and magnetic properties [1][2][3][4][5][6][7][8][9][10][11]. Ferrites have been reported as better electromagnetic materials than pure metals because of their low cost, high resistivity and ease of preparation. The properties of the ferrite materials, which decide the application areas, are generally governed by the chemical compositions along with the procedures followed for their preparation. Therefore, the molecular engineering of ferrite composition and employment of appropriate process parameters play a significant role in tailoring the material properties for a specific need. The properties of the ferrites can be modified by substituting the optimum amount of metal ions as dopant in the basic compositional formulae. It is, therefore, desirable to investigate and understand the dependence of composition on magnetic/electric behavior of these ferrites. Ferrite nanoparticles show unusual magnetic properties such as single domain behavior and superparamagnetism which are not observed in bulk material [12,13]. Also, the resistivity of the ferrites at room temperature can vary from 10 -2 to 10 11 ohm-cm [14][15][16]. The change in the resistivity is brought about by substitution of some appropriate metal ion in the metal site. To obtained sample with high resistivity, it is necessary to ensure that there are no ferrous ions in the stoichiometric ferrite. Therefore, chemical aspect has become the most important factor in the design and preparation of ferrite materials. Solution combustion method has been found to be the most suitable technique for the synthesis of a particular mixed ferrite composition. The properties of the final product (particle size, surface area and porosity) depend on the way the combustion is conducted. The departure of gases favours the desegregation of th...

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“…Of them, the sol-gel technique provides a simple and economic alternative for preparation of Li-ferrites at reduced temperature. This technique ensures good stoichiometric control, production of nanosized particles with narrow size distribution in a relatively shorter time, good homogeneity, and high sinterability [9,10]. Higher heat treatment, as known, is for better crystallization, growth of microstructures and densification [11].…”

Section: Introductionmentioning

confidence: 99%

Low dielectric loss in nano-Li-ferrite spinels prepared by sol–gel auto-combustion technique

et al. 2016

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Pure and doped nano-Li-ferrite spinels were prepared by the sol-gel auto-combustion technique. The prepared ferrites were pelleted and heat treated at different temperatures. Structural characterization was carried out on the as-prepared samples and also on the heat-treated samples using X-ray diffraction (XRD). The studies confirmed the formation of single phase with spinel structures in all the samples. The crystallite size of the samples evaluated from XRD data was found to be 17-24 nm. Scanning electron microscopic photomicrographs revealed the microstructures and the grain size of these nanoferrites. The room-temperature dielectric constant and dielectric loss tangent, tan δ were measured as a function of frequency in the range 100 Hz-1 MHz. These nanoferrites showed the normal dielectric dispersion behaviour. The observed dielectric constant and dielectric loss tangent were found to be much lower than those measured on substituted Li-ferrites prepared by the conventional ceramic method. The results obtained were discussed in the paper.

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Sol–gel derived nanoparticles of Zn substituted lithium ferrite (Li0.32Zn0.36Fe2.32O4): magnetic and Mössbauer effect measurements and their theoretical analysis

Cited by 41 publications

References 32 publications

Effect of heat treatment on structural and magnetic properties of Li–Ni ferrite prepared via sol–gel auto-combustion method

Effect of heat treatment on structural and magnetic properties of Li–Ni ferrite prepared via sol–gel auto-combustion method

Effect of Zn dopant on Properties of Li ferrite Synthesized by Solution Combustion Method

Low dielectric loss in nano-Li-ferrite spinels prepared by sol–gel auto-combustion technique

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