Structural evolution and magnetic properties of nanocrystalline magnesium–zinc soft ferrites synthesized by glycine–nitrate combustion process

Hajarpour, S.; Honarbakhsh-Raouf, A.; Gheisari, Kh.

doi:10.1016/j.jmmm.2014.03.027

Cited by 37 publications

(5 citation statements)

References 21 publications

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“…Un incremento en los valores de Ms fue alcanzado por las muestras cuando x aumentó desde 0 y hasta 0,3 de Zn 2+ (20,22-40,30 emu/g) para posteriormente disminuir a partir de x≥0,4. Se sabe que la magnetización de saturación que puede ser alcanzada por las NPMs depende directamente de la diferencia entre los momentos magnéticos netos de las sub-redes A (sitios tetraédricos) y B (sitios octaédricos) de la espinela [12,14] y que para el caso de las ferritas Fe-Mg-Zn este valor dependerá de la presencia de los iones Fe 3+ en ambas sub-redes y de su constante reordenamiento debido a la presencia de los iones no-magnéticos (Mg 2+ y Zn 2+ ) [14,15]. Adicionalmente se ha reportado que el catión Zn 2+ tiene preferencia a ocupar sitios A y a migrar a sitios B cuando x ≥ 0,4, promoviendo que los iones Fe 3+ cambien su posición y el momento magnético neto varíe [16], lo cual explica la variación en los valores de Ms reportados en este trabajo.…”

Section: Resultados Y Discusiónunclassified

Síntesis y estudio de propiedades estructurales y magnéticas de ferritas Mg1-xZnxFe2O4 (x= 0-0,9)

et al. 2018

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RESUMENActualmente las nanopartículas magnéticas a base de óxido de hierro son utilizadas en diversas aplicaciones en las áreas de ciencia y tecnología, principalmente por sus propiedades magnéticas. Asimismo, estos materiales son utilizados en aplicaciones biomédicas tales como en la obtención de imágenes por resonancia magnética, hipertermia magnética, liberación de fármacos, etc. En este trabajo se reporta la síntesis y caracterización de ferritas de Mg y Zn con composición química Mg 1-x Zn x Fe 2 O 4 (x=0-0,9) mediante el método de descomposición térmica (DT). Se utilizaron acetilacetonatos metálicos (Mg, Zn y Fe) como reactivos y ácido oleico/feniléter como medio de reacción. Los materiales obtenidos se caracterizaron utilizando las técnicas de difracción de rayos X (DRX), magnetometría de muestra vibrante (MMV), espectroscopia de infrarrojo por transformada de Fourier (FT-IR) y microscopía electrónica de transmisión (MET). Los patrones de difracción de rayos X de los materiales obtenidos muestran la formación de una única fase cristalina con estructura de espinela inversa correspondiente a una ferrita de magnesio (JCPDS 88-1935). Las propiedades magnéticas, tales como magnetización de saturación (Ms), magnetización remanente (Mr) y campo coercitivo (Hc) de las ferritas Mg-Zn fueron evaluadas mediante MMV. Se encontró que la Ms aumenta a medida que se incrementa el contenido de Zn 2+ alcanzando valores de 20,22 a 40,30 emu/g, dicho cambio se atribuye a la variación de la distribución de los cationes presentes en la estructura de espinela. Mediante FT-IR y MET se determinó que las partículas sintetizadas poseen un recubrimiento superficial de ácido oleico, una morfología cercana a la esférica y un tamaño de partícula inferior a los 10 nm. De estos resultados se confirma la viabilidad de la incorporación de iones Zn dentro de la estructura cristalina de MgFe 2 O 4 utilizando el método de DT, obteniéndose ferritas potencialmente utilizables en aéreas biomédicas.Palabras clave: Ferritas, Descomposición térmica, Ácido oleico, Propiedades magnéticas. ABSTRACTNowadays, iron oxide based magnetic nanoparticles are used in several science and technology applications due to their magnetic properties. Likewise, these materials are used in biomedical applications such as contrast agents for magnetic resonance imaging, magnetic hyperthermia, targeted drug delivery, etc. In this work, the synthesis and characterization of Mg, Zn-containing ferrites with the chemical formula of Mg 1-x Zn x Fe 2 O 4 (0-0,9) were performed. Synthesis was carried out by thermal decomposition method (DT) using metal acetylacetonates (Mg, Zn and Fe) as reactants and oleic acid/phenyl-ether as reaction medium. The obtaining materials were characterized by X-ray diffraction (XRD), vibrating sample magnetometry (VSM), Fourier trans-

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Section: Resultados Y Discusiónunclassified

Síntesis y estudio de propiedades estructurales y magnéticas de ferritas Mg1-xZnxFe2O4 (x= 0-0,9)

et al. 2018

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“…The fortuity of preparing ferrites in the form of nanoparticles has opened a novel and exciting trend in the research field. There are many methods for synthesis of hexagonal ferrite nanoparticles, like chemical coprecipitation [14], hydrothermal [15], sol-gel [16,17], combustion [18] etc. In the present work, calcium hexaferrites substituted with trivalent chromium ions synthesized by sol-gel microwave auto combustion method are studied and reported.…”

Section: Experimental Methodsmentioning

confidence: 99%

Synthesis and Characterization of Nano-Hexagonal Calcium Ferrites

Rajashekara¹

2020

JNST

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The comparative study of substituted calcium hexaferrites samples with chemical composition CaCrxFe12-xO19 where, x= 0,2,4,6 have been chosen for their studies on structural and magnetic properties. Structural and morphological properties are studied by X-ray diffraction technique and scanning electron microscopy (SEM). The XRD pattern confirmed that the formation of single phase hexagonal ferrites with space group P63/mmc 167:R-3c. The SEM results confirms that the sample exhibit relatively well defined hexagonal like grains with average particle size found in between 24 to 40 nm. Magnetic characterization of the samples is carried out using vibrating sample magnetometer (VSM). The saturation magnetization (Ms), remanence (Mr) and coercivity (Hc) are found to decrease with increase in the value of substitution which is attributed to the occupation of sub lattice spin-up and spin-down sites by diamagnetic ions and anisotropy. The samples have a better signal-to-noise ratio, as the particle size was less than 50 nm, when calculated by Debye-Scherer formula and may be suitable for recording media.

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“…Mazrouei et al. reported a novel preparation of cobalt spinel ferrite nanopowders using urea and glycine as fuels, respectively, and compared the specific surface area of the product prepared with different fuels [10] . Yao et al.…”

Section: Introductionmentioning

confidence: 99%

“…[9] Mazrouei et al reported a novel preparation of cobalt spinel ferrite nanopowders using urea and glycine as fuels, respectively, and compared the specific surface area of the product prepared with different fuels. [10] Yao et al prepared a sponge-like Ni x Zn 1x Fe 2 O 4 system using polyvinyl pyrrolidone (PVP) as the soft template. As the temperature increased, gases released from the nitrates blew the molten PVP into numerous bubbles, forming a 3D sponge structure.…”

Section: Introductionmentioning

confidence: 99%

Combustion Synthesis of Porous NiCuZn Spinel Ferrite Hierarchies and Their Magnetic Properties

Chen,

Qian,

Zhang

et al. 2023

ChemistrySelect

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Nickel‐copper‐zinc (NiCuZn) spinel ferrites have attracted intensive research owing to their unique magnetic properties and low co‐fire temperature. Combustion synthesis has been viewed as a promising protocol for the large‐scale fabrication of NiCuZn spinel ferrites. However, the spinel ferrites prepared by this method usually suffer from limited saturation magnetization and high coercivity due to their large size, which will impose detrimental harmonics on electrical equipment (e. g., transformer, motor, etc.). To address these issues, highly porous NiCuZn spinel ferrite hierarchies were prepared within several hours through a modified solution combustion method, using glucose and ammonium nitrate as the fuel and combustion enhancer, respectively. The as‐obtained NiCuZn spinel ferrite hierarchies show excellent magnetic properties with a high saturation magnetization up to 62.61 emu/g and a low coercivity of 9.6 Oe thanks to the rational distribution of cations and grain size. More importantly, this method also allows various modifications (heteroatom doping) and large‐scale applications, which may be promising for the fabrication of high‐performance soft magnets for electrical equipment.

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Structural evolution and magnetic properties of nanocrystalline magnesium–zinc soft ferrites synthesized by glycine–nitrate combustion process

Cited by 37 publications

References 21 publications

Síntesis y estudio de propiedades estructurales y magnéticas de ferritas Mg1-xZnxFe2O4 (x= 0-0,9)

Síntesis y estudio de propiedades estructurales y magnéticas de ferritas Mg1-xZnxFe2O4 (x= 0-0,9)

Synthesis and Characterization of Nano-Hexagonal Calcium Ferrites

Combustion Synthesis of Porous NiCuZn Spinel Ferrite Hierarchies and Their Magnetic Properties

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