Effect of cobalt substitution on physical &amp; electro-magnetic properties of SrAl4Fe8O19 hexa-ferrite

Shekhawat, Deepshikha; Roy, P.K.

doi:10.1016/j.matchemphys.2019.03.008

Cited by 22 publications

(9 citation statements)

References 36 publications

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“…The presence of these peaks at specific angles verifies the generation of nanoparticles to card number JCPDS 01-080-1197. There is no secondary peak for an extra phase of hematite observed in the pure sample . However, the XRD patterns of cobalt-substituted strontium hexaferrite ( x = 0.15, 0.24, and 0.50) display a desired phase of the strontium M-type hexaferrite and an undesired phase of hematite (Fe 2 O 3 ).…”

Section: Resultsmentioning

confidence: 95%

“…18 The magnetic properties such as saturation magnetization (M s ), coercivity (H c ), and remanence magnetization (M r ) were studied through (M−H) hysteresis loop obtained from a vibrating sample magnetometer. 19 However, the XRD patterns of cobaltsubstituted strontium hexaferrite (x = 0.15, 0.24, and 0.50) display a desired phase of the strontium M-type hexaferrite and an undesired phase of hematite (Fe 2 O 3 ). It can be assumed that during the calcination, magnetite got oxidized into a very stable non-magnetic hematite.…”

Section: Characterization Techniquesmentioning

confidence: 99%

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Improved Electrical Properties of Strontium Hexaferrite Nanoparticles by Co²⁺ Substitutions

2022

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In this work, the sol–gel route was employed to synthesize a series of Co2+-substituted strontium hexaferrite nanoparticles (Sr1–x Co x Fe12O19, x = 0.0–0.50) to study the effect of cobalt ions doping on the magnetic, electrical, and structural properties of the nanoparticles. The structural analysis of the synthesized nanoparticles, performed by X-ray diffraction, showed the formation of a hexagonal structure having no secondary phases. The morphological analysis, performed through scanning electron microscopy, revealed spherical shaped nanoparticles with uniform distribution. Fourier transform infrared spectra demonstrated two consistent absorption bands indicating the intrinsic stretching vibrations around 600 and 400 cm–1 for tetrahedral and octahedral sites, respectively. It was observed through VSM that with cobalt addition, the saturation magnetization increased and the coercivity decreased. Also, a typical decreasing trend of DC electrical resistivity with increasing temperature measured by a two-probe method confirmed the semiconducting behavior of the synthesized samples. An impedance analyzer was used for the dielectric measurements at room temperature against the alternating frequency range of 250 Hz to 5 MHz, and it was found that the dielectric constant decreased with the increase in cobalt content, suggesting that the doped nanomaterials can be used for microwave absorption, electronics, telecommunication, and other high-frequency applications.

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Section: Resultsmentioning

confidence: 95%

Section: Characterization Techniquesmentioning

confidence: 99%

Improved Electrical Properties of Strontium Hexaferrite Nanoparticles by Co²⁺ Substitutions

2022

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“…In addition, the immense capacity to modify ferrites' properties opens the possibility to design materials with novel functionalities. The chemical composition and the crystal structure are the two main aspects that define their characteristics, which can be controlled by an appropriate synthesis and processing route [1][2][3][4] . These materials can be applied in a wide range of technological applications, such as biomedicine 5,6 , electronics 7,8 or energy storage 9,10 .…”

Section: Introductionmentioning

confidence: 99%

“…If the goal is to produce high-purity nanoparticles, wet chemical methods is an interesting group of processes with many different approaches. Some of these approaches are thermal decomposition 25 , hydrothermal 3,10 , solvothermal 26 , co-precipitation [27][28][29] , or sol-gel 2,14,20 for instance.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the Synthesis Route in Obtaining the Cubic or Tetragonal Copper Ferrite Phases

Rosa

Segarra

2020

Inorg. Chem.

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In this work, magnetic copper ferrite nanoparticles are synthesized by polymer-assisted sol-gel and co-precipitation methods. The obtained purity and particle size reach values of 96 % and 94 nm, respectively. Evident differences in the crystal structure have been found in the synthesized nanoparticles. A tetragonal structure is formed by the sol-gel method, while the cubic form is obtained when the co-precipitation approach is used. This work provides an experimental evidence of the formation of both phases by using the same reactants and thermal conditions, and only modifying the technical procedure. The formation and stability of each phase is analysed by temperature dependent measurements, and the observed crystal structure differences are used to propose a potential fundamental explanation to our observations based on a difference on the cations' distribution and the Jahn-Teller distortion. Moreover, different copper ferrite purity and particle sizes are found when using each of the methods. The spherical shape of the particles and their tendency to sinter forming micrometric clusters are observed by electron microscopy. Finally, the divergence in magnetization between the samples prepared by each method support our argument about the different cations' distribution and open the door to a wide range of different technological applications for these materials.

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Tuning magnetic properties in the Ce–Al Co-substituted M-type BaSr (6:4) hexaferrites

Makhdoom

Ahmed

Ghori

et al. 2022

J Mater Sci: Mater Electron

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Effect of cobalt substitution on physical & electro-magnetic properties of SrAl4Fe8O19 hexa-ferrite

Cited by 22 publications

References 36 publications

Improved Electrical Properties of Strontium Hexaferrite Nanoparticles by Co²⁺ Substitutions

Improved Electrical Properties of Strontium Hexaferrite Nanoparticles by Co²⁺ Substitutions

Influence of the Synthesis Route in Obtaining the Cubic or Tetragonal Copper Ferrite Phases

Tuning magnetic properties in the Ce–Al Co-substituted M-type BaSr (6:4) hexaferrites

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Effect of cobalt substitution on physical & electro-magnetic properties of SrAl4Fe8O19 hexa-ferrite

Cited by 22 publications

References 36 publications

Improved Electrical Properties of Strontium Hexaferrite Nanoparticles by Co2+ Substitutions

Improved Electrical Properties of Strontium Hexaferrite Nanoparticles by Co2+ Substitutions

Influence of the Synthesis Route in Obtaining the Cubic or Tetragonal Copper Ferrite Phases

Tuning magnetic properties in the Ce–Al Co-substituted M-type BaSr (6:4) hexaferrites

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Product

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Improved Electrical Properties of Strontium Hexaferrite Nanoparticles by Co²⁺ Substitutions

Improved Electrical Properties of Strontium Hexaferrite Nanoparticles by Co²⁺ Substitutions