Mechanism of γ-irradiation induced phase transformations in nanocrystalline Mn0.5Zn0.5Fe2O4 ceramics

Angadi, V. Jagadeesha; Anupama, A.V.; Choudhary, Harish Kumar; Kumar, Rajiv; Somashekarappa, H.M.; Mahanthappa, Mallappa; Rudraswamy, B.; Sahoo, Balaram

doi:10.1016/j.jssc.2016.11.017

Cited by 55 publications

(2 citation statements)

References 31 publications

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“…The trend of the average grain size is in good agreement with previous studies, as confirmed by statistical data obtained with Jader 5.0 software and distribution analysis software. 27,28…”

Section: Resultsmentioning

confidence: 99%

The influence of Ca substitution on LaFeO₃ nanoparticles in terms of structural and magnetic properties

Lin

Yang

et al. 2018

Journal of Applied Biomaterials & Functional Materials

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Background: The nanocrystalline structure of La 1-x Ca x FeO 3 was prepared by a sol-gel method involving an autocombustion process. The incorporation of rare-earths in LaFeO 3 induces strain in magnetic properties, especially in terms of the following parameters: replacement amount, oxygen partial pressure, and calcination temperature. Methods: To determine the effects of the amount of Ca 2+ ion doping agent and the calcination temperature on the microstructure, particle morphology, and magnetic properties of LaFeO 3 crystal, we performed the following respective analytical methods: X-ray powder diffraction, Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscopy, and vibrating sample magnetometer tests. Results: The orthorhombic structure of LaFeO 3 perovskite did not change even when it was doped with Ca 2+ ions, and its space group continued to be Pnma (No.62). FT-IR spectra confirmed that the main band appearing at 568 cm −1 is due to the antisymmetric stretching vibration of Fe-O-Fe bonds in FeO 6 . The introduction of Ca inhibits the growth of grains but the morphology of particles is improved. With an increasing concentration of Ca 2+ ions, magnetic behavior of the samples also witnessed an increasing trend in a proportionate manner. With an increase in calcination temperature, the enclosed area of the magnetic hysteresis curve of the sample reduced remarkably. Conclusions: The growth of nanoparticles can be restrained with an increase of Ca content that is used as doping agent. The magnetic behavior of La 1-x Ca x FeO 3 tilts towards G-type antiferromagnetism; the magnetic orientation is achieved from the super exchange interaction of Fe 3+ ions with oxygen ions.

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“…The trend of the average grain size is in good agreement with previous studies, as confirmed by statistical data obtained with Jader 5.0 software and distribution analysis software. 27,28…”

Section: Resultsmentioning

confidence: 99%

The influence of Ca substitution on LaFeO₃ nanoparticles in terms of structural and magnetic properties

Lin

Yang

et al. 2018

Journal of Applied Biomaterials & Functional Materials

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“…Initially, the value of M s is decreased from 57.9 to 35.6 emu/g with the Ce 3+ doping level for 0.01 and is then increased to 48.7 emu/g with x = 0.02. This can be explained by the fact that the ferrites follow Neel's two-sub-lattice model [35]. According to Neel's two-sub-lattice model, the magnetic moment per formula unit is given by η B = M B − M A , where M B and M A are the B and A sub-lattice magnetic moments (in μ B ).…”

Section: Magnetic Studymentioning

confidence: 99%

Effect of Ce3+ Ion on Structural and Hyperfine Interaction Studies of Co0.5Ni0.5Fe2−xCexO4 Ferrites: Useful for Permanent Magnet Applications

Srinivasamurthy

Angadi

Кубрин

et al. 2018

J Supercond Nov Magn

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Nanoparticles of Co 0.5 Ni 0.5 Fe 2−x Ce x O 4 (where x = 0.0, 0.01, 0.015 and 0.02) ferrites are prepared by the modified solution combustion method using a mixture of fuels and are characterized to understand their structural, microstructural and magnetic properties. The X-ray diffraction is used to confirm the formation of a single-phase cubic spinel structure. The average crystallite sizes are calculated using the Scherrer formula and are found to be less than 50 nm. The microstructural features are obtained by the scanning electron microscopy, and the compositional analysis is done by using the energydispersive spectroscopy. The transmission electron microscopy (TEM) investigations show that the synthesized ferrites are made up of very fine spherical nanoparticles. The influence of a rare-earth element (Ce 3+) on the magnetic properties of the samples was studied using the Mössbauer spectroscopy. The Mössbauer spectroscopy reveals the formation of broadened Zeeman lines and quadrupole-split lines and the presence of the Fe 3+ charge state at B sites in the samples. The quadrupole splitting shows that the orientation of the magnetic hyperfine field with respect to the principle axes of the electric field gradient was random. The magnetic hyperfine field values indicate that the A sites have more A-O-B superexchange interactions than the B sites. The coexistence of magnetic sextet and a doublet component on the room-temperature spectra suggests superparamagnetic properties of the nanoparticles. The low-temperature (15 K) Mössbauer spectroscopy explores the paramagnetic relaxation in the nanoparticles. The area under the sextet refers to Fe 3+ concentrations in the tetrahedral and octahedral sites of the ferrite. This study confirms that the Ce 3+ substitution of Fe 3+ only for octahedron sites causes the decrease in Fe-O-Fe arrangement. The effect of Ce 3+ doping on the magnetic properties of Co 0.5 Ni 0.5 Fe 2 O 4 is examined from the vibrating sample magnetometry (VSM) spectra. Saturation magnetization values are decreased initially and then increased, as result of Ce 3+ doping. This can be explained by Neel's two-sub-lattice model. Further, the value of coercivity is found to be increasing with increasing Ce 3+ concentration. The obtained results of M-H loop with improved coercivity (from 851 to 1039 Oe) by Ce 3+ doping of Co 0.5 Ni 0.5 Fe 2 O 4 demonstrate the usefulness for permanent magnet applications.

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Spinel Ferrite Nanoparticles: Synthesis, Crystal Structure, Properties, and Perspective Applications

Tatarchuk

Bououdina

Vijaya³

et al. 2017

Springer Proceedings in Physics

163

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Mechanism of γ-irradiation induced phase transformations in nanocrystalline Mn0.5Zn0.5Fe2O4 ceramics

Cited by 55 publications

References 31 publications

The influence of Ca substitution on LaFeO₃ nanoparticles in terms of structural and magnetic properties

The influence of Ca substitution on LaFeO₃ nanoparticles in terms of structural and magnetic properties

Effect of Ce3+ Ion on Structural and Hyperfine Interaction Studies of Co0.5Ni0.5Fe2−xCexO4 Ferrites: Useful for Permanent Magnet Applications

Spinel Ferrite Nanoparticles: Synthesis, Crystal Structure, Properties, and Perspective Applications

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Mechanism of γ-irradiation induced phase transformations in nanocrystalline Mn0.5Zn0.5Fe2O4 ceramics

Cited by 55 publications

References 31 publications

The influence of Ca substitution on LaFeO3 nanoparticles in terms of structural and magnetic properties

The influence of Ca substitution on LaFeO3 nanoparticles in terms of structural and magnetic properties

Effect of Ce3+ Ion on Structural and Hyperfine Interaction Studies of Co0.5Ni0.5Fe2−xCexO4 Ferrites: Useful for Permanent Magnet Applications

Spinel Ferrite Nanoparticles: Synthesis, Crystal Structure, Properties, and Perspective Applications

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The influence of Ca substitution on LaFeO₃ nanoparticles in terms of structural and magnetic properties

The influence of Ca substitution on LaFeO₃ nanoparticles in terms of structural and magnetic properties