Structural elucidation and dielectric behavior evaluation of sol-gel synthesized Co–Al co-substituted M-type hexaferrite materials

Gulbadan, Shagufta; Ejaz, Syeda Rabia; Nizamani, Altaf H.; Shakir, Imran; Agboola, Philips O.; Akhtar, Majid Niaz; Warsi, Muhammad Farooq; Khan, Muhammad Azhar

doi:10.1016/j.ceramint.2019.10.228

Cited by 65 publications

(5 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This study showed obtaining control interfacial structures by adding an Ultrasonic technique in addition to the co-precipitation method [6]. Another study describes the effect of Cobalt and aluminum doping on M-type hexaferrite materials synthesized by the Sol-gel method [20]. Sharma et al analyzed the effect of Gd 3+ doping in M-type barium hexaferrites.…”

Section: Introductionmentioning

confidence: 99%

Exploring the structural and magnetic trends in Ba_0.9Sm_0.1Fe_12−xAl_xO₁₉ M-type Hexaferrites

Asif¹,

Ranjha²,

Ghori³

et al. 2022

Phys. Scr.

View full text Add to dashboard Cite

Current study describes the structural and magnetic properties of Ba0.9Sm0.1Fe12-xAlxO19 (x=0.0, 0.5, 1.0, 2.0, 3.0) M-type hexaferrites. Conventional ceramic route was implied to prepare all the nominal samples. Morphological analysis suggested the non-presence of secondary phases as well as formation of the hexaferrites material. X-ray Diffraction technique was used for structural analysis from which microstructural parameters are calculated and discussed. Magnetic properties are measured at room temperature. The saturation magnetization (Ms) and coercivity (Hc) values shows a cyclic and converse trend for synthesized samples. Firstly, a decrease in Ms and increase in Hc was observed up to intermediate dopant incorporation, and becomes converse for higher doping levels. The maximum coercivity and minimum magnetization is observed for Ba0.9Sm0.1Fe11Al1O19. The c/a and Mr/Ms ratio suggest the formation of perfect M-type hexaferrites. This work suggests that synthesized material is a good option for magnetic applications e.g., transformer and inductor cores, microwave devices, recording heads, and magnetic shielding.

show abstract

Section: Introductionmentioning

confidence: 99%

Exploring the structural and magnetic trends in Ba_0.9Sm_0.1Fe_12−xAl_xO₁₉ M-type Hexaferrites

Asif¹,

Ranjha²,

Ghori³

et al. 2022

Phys. Scr.

View full text Add to dashboard Cite

show abstract

“…This implies that the introduction of rare‐earth elements may alter the magnetic anisotropy of ferrites. [ 28 ] Moreover, a higher concentration of rare‐earth elements exacerbates lattice distortion, challenging the orderly alignment of magnetic moments within the crystal. Collectively, these factors hinder the alignment of magnetic moments in the presence of an external field, weakening the overall magnetic properties of iron oxide.…”

Section: Resultsmentioning

confidence: 99%

“…The dielectric constant of the sample decreases gradually with increasing frequency, which is a common dielectric behavior of ferrite materials. According to the Maxwell-Wagner polarization model, this trend can be explained by a dual-layer dielectric structure, [25,33,34] where one layer consists of conducting grains and the other layer consists of nonconducting thin grain boundaries. In the low-frequency region, the conducting ferrite grains dominate, leading to a higher dielectric constant.…”

Section: Dielectric Constantmentioning

confidence: 99%

Structural Elucidation and Evaluation of Magnetic and Dielectric Properties of Lu–La Co‐substituted M‐Type Hexagonal Ferrites Synthesized by Chemical Co‐precipitation Method

Wang,

Han

2024

Physica Status Solidi (a)

View full text Add to dashboard Cite

In this research, LuxLaySr1–yFe12–xO19, an M‐type strontium ferrite, is synthesized using the coprecipitation method with precursor chemicals. The samples undergo analysis for structure, morphology, and elemental composition through X‐ray diffraction (XRD) and scanning electron microscopy (SEM). Magnetic and dielectric properties are determined using a vibrating sample magnetometer (VSM) and a dielectric property measurement instrument (LCR), respectively. The primary objective of this study is to enhance the dielectric performance of the samples through rare‐earth element doping. The XRD analysis reveals that the samples display a hexagonal single‐phase magnetoplumbite crystal structure. SEM micrographs illustrate a regular hexagonal structure of the grains. VSM analysis affirms LuxLaySr1–yFe12–xO19 as a hard magnetic material with a high coercivity. As the rare‐earth element content increases, the coercivity of the samples significantly decrease from 2065.3 to 910.3 Oe. Dielectric property analysis demonstrates that augmenting the rare‐earth element (Lu–La) content notably increases the relative dielectric constant of the samples. In the low‐frequency region, the relative dielectric constant ranges from 6.71 × 103 to 1.28 × 105, while in the high‐frequency region, it ranges from 3.09 × 103 to 2.03 × 104. Samples doped with rare‐earth elements exhibit a high dielectric constant and low coercivity, rendering them suitable for applications in electromagnetic shielding materials. This can help reduce interference from magnetic fields on internal components while blocking electromagnetic waves.

show abstract

“…Hexaferrites have been synthesized using various techniques including the sol–gel auto combustion, [ 143–146 ] ceramic method, [ 147 ] solid‐state reaction, [ 148,149 ] sol–gel, [ 53 ] solvent‐free synthesis, [ 150 ] coprecipitation R L = −20log|S11 [ 151,152 ] hydrothermal, [ 141,153 ] solvothermal, [ 154 ] reverse microemulsion technique, [ 155,156 ] precursor‐directed synthesis, [ 157 ] citrate precursor technique, [ 158 ] thermal plasma, [ 159 ] pulsed wire discharge, [ 50 ] sol–gel‐citrate method, [ 261 ] the sol–gel‐hydrothermal technique, [ 79 ] etc. A reasonable number of researchers applied these methods for synthesizing the hexagonal ferrites.…”

Section: Synthesis Methods Of the Hexagonal Ferritesmentioning

confidence: 99%

Recent Progress in Hexagonal Ferrites Based Composites for Microwave Absorption

Mohammed

Mohammed²,

Srivastava

2022

Cryst. Res. Technol.

View full text Add to dashboard Cite

With the fast growth of wireless communication technology in high‐frequency ranges, electromagnetic (EM) interference has become a growing concern that has drawn international attention. The development of materials that can absorb EM radiation is a crucial solution. This review provides a detailed overview of ferrites, specifically hexagonal ferrites and their composites for microwave (MW) absorption. It examines hexagonal ferrite classifications based on the stacking order of their fundamental blocks and their synthesis methods and strategies for improving their magnetic properties. On the other hand, this review included a detailed examination of hexagonal ferrites–conducting polymer, hexagonal ferrites–2D materials, and hexagonal ferrite–other nanomaterials composites for MW absorption applications. Enhancing MW absorption in hexagonal ferrites‐based microwave absorption materials (MAMs) regulates their EM characteristics, improves impedance matching, and creates a diversity of loss mechanisms. In addition, the limitations, challenges, and opportunities of hexagonal ferrites‐based MAMs are discussed, which will be helpful to those working in related areas. As a general application potential, it is worth mentioning that, as a result of recent promising findings in the synthesis of hexagonal ferrites‐based composites, hexaferrite‐based composites are suitable devices in the area of microwave absorption.

show abstract

Structural elucidation and dielectric behavior evaluation of sol-gel synthesized Co–Al co-substituted M-type hexaferrite materials

Cited by 65 publications

References 34 publications

Exploring the structural and magnetic trends in Ba_0.9Sm_0.1Fe_12−xAl_xO₁₉ M-type Hexaferrites

Exploring the structural and magnetic trends in Ba_0.9Sm_0.1Fe_12−xAl_xO₁₉ M-type Hexaferrites

Structural Elucidation and Evaluation of Magnetic and Dielectric Properties of Lu–La Co‐substituted M‐Type Hexagonal Ferrites Synthesized by Chemical Co‐precipitation Method

Recent Progress in Hexagonal Ferrites Based Composites for Microwave Absorption

Contact Info

Product

Resources

About

Structural elucidation and dielectric behavior evaluation of sol-gel synthesized Co–Al co-substituted M-type hexaferrite materials

Cited by 65 publications

References 34 publications

Exploring the structural and magnetic trends in Ba0.9Sm0.1Fe12−xAlxO19 M-type Hexaferrites

Exploring the structural and magnetic trends in Ba0.9Sm0.1Fe12−xAlxO19 M-type Hexaferrites

Structural Elucidation and Evaluation of Magnetic and Dielectric Properties of Lu–La Co‐substituted M‐Type Hexagonal Ferrites Synthesized by Chemical Co‐precipitation Method

Recent Progress in Hexagonal Ferrites Based Composites for Microwave Absorption

Contact Info

Product

Resources

About

Exploring the structural and magnetic trends in Ba_0.9Sm_0.1Fe_12−xAl_xO₁₉ M-type Hexaferrites

Exploring the structural and magnetic trends in Ba_0.9Sm_0.1Fe_12−xAl_xO₁₉ M-type Hexaferrites