Structural, magnetic and microwave absorption properties of SrFe12−2x(Mn0.5Cd0.5Zr)xO19 ferrite

Kiani, Esmail; Rozatian, A. S. H.; Yousefi, Mohammad

doi:10.1016/j.jmmm.2014.02.042

Cited by 56 publications

(10 citation statements)

References 24 publications

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“…With the reduction in particle size, the surface effects become more obvious, so the magnetic and microwave properties differ significantly from those of the bulk materials. It is shown that the surface spins of ferrite nanoparticles are in a disordered state because of the broken superexchange bonds [19,27]. The surface spins may lead to a high magnetic loss.…”

Section: Microwave Absorption Studymentioning

confidence: 99%

Structural, magnetic and microwave absorption properties of doped Ba-hexaferrite nanoparticles synthesized by co-precipitation method

Alam

Moradi

Rostami

et al. 2015

Journal of Magnetism and Magnetic Materials

181

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Section: Microwave Absorption Studymentioning

confidence: 99%

Structural, magnetic and microwave absorption properties of doped Ba-hexaferrite nanoparticles synthesized by co-precipitation method

Alam

Moradi

Rostami

et al. 2015

Journal of Magnetism and Magnetic Materials

181

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“…The crystallite size (D) was estimated by using the Scherrer formula [16]. According to Phuoc et al [17], the activation energy is strongly related to the size of the single crystal of nanoparticles.…”

Section: Microstructure-related Analysismentioning

confidence: 99%

Development of Magnetic B-H Hysteresis Loops Through Stages of Microstructure Evolution of Bulk BaFe12 O 19

Huang

Hashim

Ismail

et al. 2015

J Supercond Nov Magn

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A series of polycrystalline BaFe 12 O 19 bulk samples produced have been used to investigate the parallel evolving relationship between the microstructural and magnetic properties of the magnetic material. The raw material starting powders were prepared via the mechanical alloying method and subsequently moulded and pressed by using a hydraulic pressing machine. The nanosized samples were sintered from 700 to 1300 • C with 100 • C increments in static air conditions. The sintered samples were characterized and analysed with increasing sintering temperature to study their crystallinity, microstructural and magnetic properties. The result shows the magnetic B-H hysteresis loop varies with grain size, which was attributed to the increasing crystallinity and changing magnetic parameters. The microstructural properties like grain size were measured by using FeSEM, the phase analysis of the material was analysed with X-ray diffractometry (XRD) and density was determined by a densimeter, while the hysteresis loop was measured by a B-H tracer and Curie temperature was measured with an impedance analyser. The characterized samples were found to be divided into three groups which consisted of grain size varied from 0.30 to 0.39 μm (paramagnetic state), 0.46 to 0.94 μm (intermediate ferromagnetic state) and ≥ 1.78 μm (strong ferromagnetic state). For the latter two groups, slanting sigmoid hysteresis loops were observed. Well-defined sigmoid-shaped B-H hysteresis loops were obtained when high crystallinity Ismayadi Ismail was attained, allowing strong exchange interaction between neighbouring atomic magnetic moments. This indicated that the ferromagnetic state had been achieved. The observed three B-H hysteresis groups exhibited different magnetic properties, and these behaviours are useful for industrial applications.

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“…Other characteristics, such as microstructure, thickness, and surface morphology, also determine the absorbing performance of absorber materials. Some studies have reported on absorbers based on doped ferrite magnetic materials (Adi & Manaf, 2012;Duggal & Aul, 2014;Kiani et al, 2014). Likewise, absorbers based on doped dielectric properties have also been found to have absorbing characteristics (Mohit et al, 2014), and tuneable electromagnetic wave absorbers based on combined magnetic and dielectric properties through a composite structure have also been developed (Sunny et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Absorption Characteristics of the Electromagnetic Wave and Magnetic Properties of the La0.8Ba0.2FexMn½(1-x)Ti½(1-x)O3 (x = 0.1–0.8) Perovskite System

Adi¹,

Manaf²,

Ridwan³

2017

IJTech

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This paper reports on the magnetic properties and electromagnetic characterization of La0.8Ba0.2FexMn½(1-x)Ti½(1-x)O3 (x = 0.1-0.8). The La0.8Ba0.2FexMn½(1-x)Ti½(1-x)O3 (x = 0.1-0.8) materials were prepared using a mechanical alloying method. All the materials were made of analytical grade precursors of BaCO3, Fe2O3, MnCO3, TiO2, and La2O3, which were blended and mechanically milled in a planetary ball mill for 10h. The milled powders were compacted and subsequently sintered at 1000°C for 5h. All the sintered samples showed a fully crystalline structure, as confirmed using an X-ray diffractometer. It is shown that all samples consisted of LaMnO3 based as the major phase with the highest mass fraction up to 99% found in samples with x < 0.3. The mass fraction of main phase in doped samples decreased in samples with x > 0.3. The hysteresis loop derived from magnetic properties measurement confirmed the present of hard magnetic BaFe12O19 phase in all La0.8Ba0.2FexMn½(1-x)Ti½(1-x)O3 (x = 0.1-0.8) samples. The results of the electromagnetic wave absorption indicated that there were three absorption peaks of ~9 dB, ~8 dB, and ~23.5 dB, respectively, at respective frequencies of 9.9 GHz, 12.0 GHz, and 14.1 GHz. After calculations of reflection loss formula, the electromagnetic wave absorption was found to reach 95% at the highest peak frequency of 14.1 GHz with a sample thickness of around 1.5 mm. Thus, this study successfully synthesized a single phase of La0.8Ba0.2FexMn½(1-x)Ti½(1-x)O3 (x = 0.1-0.8) for the electromagnetic waves absorber material application.

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Structural, magnetic and microwave absorption properties of SrFe12−2x(Mn0.5Cd0.5Zr)xO19 ferrite

Cited by 56 publications

References 24 publications

Structural, magnetic and microwave absorption properties of doped Ba-hexaferrite nanoparticles synthesized by co-precipitation method

Structural, magnetic and microwave absorption properties of doped Ba-hexaferrite nanoparticles synthesized by co-precipitation method

Development of Magnetic B-H Hysteresis Loops Through Stages of Microstructure Evolution of Bulk BaFe12 O 19

Absorption Characteristics of the Electromagnetic Wave and Magnetic Properties of the La0.8Ba0.2FexMn½(1-x)Ti½(1-x)O3 (x = 0.1–0.8) Perovskite System

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