SrFe12O19/Zn0.65Ni0.25Cu0.1Fe2O4 Core–Shell Nanocomposite: Synthesis, Chracterization and Catalytic Activity in Aqueous Solution

Esir, S.; Junejo, Yasmeen; Baykal, A.; Toprak, Muhammet S.; Sözeri, H.

doi:10.1007/s10904-014-0031-2

Cited by 12 publications

(6 citation statements)

References 29 publications

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“…(d)], suggesting two‐phase behavior. The magnetic properties of the raw mixture are in accordance with previously published results about mixtures of hard/soft magnetic materials without an exchange interaction between the hard and soft phase . Namely, this kink also indicates that the magnetization reversal does not occur under the same strength of an applied field for both materials (the materials are not exchange coupled) .…”

Section: Resultssupporting

confidence: 90%

“…The magnetic properties of the raw mixture are in accordance with previously published results about mixtures of hard/soft magnetic materials without an exchange interaction between the hard and soft phase . Namely, this kink also indicates that the magnetization reversal does not occur under the same strength of an applied field for both materials (the materials are not exchange coupled) . On the contrary, the magnetic properties of the C6 composite suggest single‐phase behavior typical for efficiently exchange‐coupled hard–soft magnetic composites .…”

Section: Resultssupporting

confidence: 89%

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Ferrite‐Based Exchange‐Coupled Hard–Soft Magnets Fabricated by Spark Plasma Sintering

et al. 2016

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Ferrite-based, hard-soft magnetic nanocomposites with the composition (100% -x)SrFe 12 O 19 -xCoFe 2 O 4 , where x = 5, 10, and 15 wt%, were prepared by mixing the constituent powders, followed by spark plasma sintering. In order to control the particle size of the constituent materials, the SrFe 12 O 19 and CoFe 2 O 4 powders were synthesized using the hydrothermal method, mixed and then consolidated with spark plasma sintering. The conditions during the spark plasma sintering process (sintering temperature, time, and applied pressure) were varied in order to prepare composites with a high density and exchange-coupled hard and soft magnetic phases, leading to an increase in the maximum energy product, when compared with pure SrFe 12 O 19 . The microstructural analysis revealed that the relative density of the sintered composite exceeded 90% of the theoretical value and that the CoFe 2 O 4 was uniformly distributed in the SrFe 12 O 19 matrix. Magnetic measurements of the sintered composites showed a single-phase magnetic behavior. When compared with the single-phase SrFe 12 O 19 used in this study, the SPS composites exhibited a 22% increase in the maximum energy product (26.1 kJ/m 3 ).

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Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 89%

Ferrite‐Based Exchange‐Coupled Hard–Soft Magnets Fabricated by Spark Plasma Sintering

et al. 2016

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“…8), is consistent with the above simple theoretical arguments. In some cases, two-stage loops, typical of spring-magnets, have also been observed [93][94][95]98,114,115,131,190,242,245,261,263,264,266,268,269,271,278,279,[282][283][284][285]289,294,295] (see Fig. 9).…”

Section: Static Magnetic Propertiesmentioning

confidence: 91%

Applications of exchange coupled bi-magnetic hard/soft and soft/hard magnetic core/shell nanoparticles

et al. 2015

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A B S T R A C TThe applications of exchange coupled bi-magnetic hard/soft and soft/hard ferromagnetic core/shell nanoparticles are reviewed. After a brief description of the main synthesis approaches and the core/shell structural-morphological characterization, the basic static and dynamic magnetic properties are presented. Five different types of prospective applications, based on diverse patents and research articles, are described: permanent magnets, recording media, microwave absorption, biomedical applications and other applications. Both the advantages of the core/shell morphology and some of the remaining challenges are discussed.

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“…To achieve high performances, PMs ideally require a squared magnetization loop to keep as much of the magnetization as possible within the magnet: specifically, a strong saturation magnetization ( M S ) together with a high remanent magnetization ( M R ) combined with a high coercivity ( H C ) (i.e., high resistance to demagnetization). , Despite considerable efforts, usually all these values cannot be maximized simultaneously in the same material. Hence, coupling materials with intrinsically different physical properties could result in nanocomposites prototypical of a new category of magnets. , For these reasons, several studies on ferrite-based NCs can be found in the literature, covering composites prepared as powders by physical mixing of the two phases, or by different chemical one-pot synthesis, ,− as multilayers films , and as dense ceramic pellets by spark plasma sinterer, or warm compaction . Nevertheless, the lack of comprehensive studies on the degree of magnetic coupling in such systems is rather broad.…”

Section: Introductionmentioning

confidence: 99%

Tuning the Magnetic Properties of Hard–Soft SrFe₁₂O₁₉/CoFe₂O₄ Nanostructures via Composition/Interphase Coupling

et al. 2021

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Magnetic nanocomposites (NCs) are extremely appealing for a wide range of energy-related technological applications, specifically as building blocks for next-generation permanent magnets. The design of such nanostructures requires precise chemical synthesis methods, which will permit the fine-tuning of the magnetic properties. Here we present an in-depth structural, morphological and magnetic characterization of ferrite-based nanostructures obtained through a bottom-up sol−gel approach. The combination of the high coercivity of a hard phase SrFe 12 O 19 (SFO) and the high saturation magnetization of a soft phase, CoFe 2 O 4 (CFO), allowed us to develop exchange-coupled bimagnetic NCs. A symbiotic effect is observed in a SFO/CFO nanocomposite, as the unique oriented growth of SFO prevents grain growth of the CFO, thus restricting the crystallite size of both. Through X-ray powder diffraction (XRPD), transmission electron microscopy (TEM), and magnetic measurements we clarify the relationship between the distribution and size of hard/soft particles, the optimization of interfaces and the obtained uniform magnetic response. This study allowed us to establish the potentiality of hard/soft SFO/CFO nanostructures in current permanent magnet technology.

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SrFe12O19/Zn0.65Ni0.25Cu0.1Fe2O4 Core–Shell Nanocomposite: Synthesis, Chracterization and Catalytic Activity in Aqueous Solution

Cited by 12 publications

References 29 publications

Ferrite‐Based Exchange‐Coupled Hard–Soft Magnets Fabricated by Spark Plasma Sintering

Ferrite‐Based Exchange‐Coupled Hard–Soft Magnets Fabricated by Spark Plasma Sintering

Applications of exchange coupled bi-magnetic hard/soft and soft/hard magnetic core/shell nanoparticles

Tuning the Magnetic Properties of Hard–Soft SrFe₁₂O₁₉/CoFe₂O₄ Nanostructures via Composition/Interphase Coupling

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SrFe12O19/Zn0.65Ni0.25Cu0.1Fe2O4 Core–Shell Nanocomposite: Synthesis, Chracterization and Catalytic Activity in Aqueous Solution

Cited by 12 publications

References 29 publications

Ferrite‐Based Exchange‐Coupled Hard–Soft Magnets Fabricated by Spark Plasma Sintering

Ferrite‐Based Exchange‐Coupled Hard–Soft Magnets Fabricated by Spark Plasma Sintering

Applications of exchange coupled bi-magnetic hard/soft and soft/hard magnetic core/shell nanoparticles

Tuning the Magnetic Properties of Hard–Soft SrFe12O19/CoFe2O4 Nanostructures via Composition/Interphase Coupling

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Product

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Tuning the Magnetic Properties of Hard–Soft SrFe₁₂O₁₉/CoFe₂O₄ Nanostructures via Composition/Interphase Coupling