Synthesis of aligned La3+-substituted Sr-ferrites via molten salt assisted sintering and their magnetic properties

Lei, Chenglong; Tang, Shujie; Du, Youwei

doi:10.1016/j.ceramint.2016.06.204

Cited by 30 publications

(4 citation statements)

References 31 publications

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“…These substitutions primarily involve certain factors. For example, earth ions with a higher atomic radius have a substitution limit whereby it is difficult to enter lattice sites, consequently this leads to crystal collapse and distortion of the strontium hexaferrite lattice [26]. In this sense, it is of great importance for the previous study to carry out satisfactorily the substitution with these elements.…”

Section: Introductionmentioning

confidence: 99%

Effect of the neodymium doping on the magnetic and structural properties of the Sr-hexaferrite obtained by the Pechini method

Ramírez-Ayala

Pérez-Juache

Herrera‐González

et al. 2022

Superficies y Vacio

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In this work, neodymium (Nd3+) doped strontium hexaferrite was obtained using the sol–gel based Pechini method. The cation distribution was modified by doping with different amounts of Nd3+ ions when 0.0 ? x ? 0.4 according to the chemical expression Sr1-xNdxFe12O19 the powders were sintered at 1100 °C for 1 h. The influence of the neodymium was analyzed, and the magnetic and structural properties have been associated with the fabrication method. The crystalline phases, structure, and particle morphology of the samples were determined by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. In addition, the magnetic properties were measured at room temperature using a vibrating sample magnetometer with an applied field of up to 20 kOe. Moreover, magnetization and coercivity values are influenced by the neodymium content. The results showed that the Pechini sol-gel method allows a limited solubility of the Nd3+ ions on the hexaferrite structure.

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Section: Introductionmentioning

confidence: 99%

Effect of the neodymium doping on the magnetic and structural properties of the Sr-hexaferrite obtained by the Pechini method

Ramírez-Ayala

Pérez-Juache

Herrera‐González

et al. 2022

Superficies y Vacio

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“…The nanocomposite material of the hard and soft magnetic phase is called an exchange spring. When this nanocomposite material was wholly dispersed, the energy density product ((BH)max) increased [2]. Some parameters such as grain size, microstructure, and interface exchange stiffness greatly influenced the exchangespring between magnetic hard and soft NCs [3].…”

Section: Introductionmentioning

confidence: 99%

Correlation between Composition and Magnetic Properties of SrFe<sub>12</sub>O<sub>19</sub>/Co Nanocomposite Synthesized by the High Energy Ball-Milling Process

Semaida

Darwish

Karpenkov

et al. 2022

KEM

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Nanocomposites (NCs) (100-x) SrFe12O19/x Co (x = 10, 20, and 30 wt. %) were produced using the high energy ball-milling (HEBM) process. The effects of hard/semi-hard ratio and annealing temperature (800, 900, and 1000 °C) on the exchange-spring in magnetic NCs were discussed. X-ray diffraction examination showed the coexistence of M-type hexaferrite SrFe12O19 (SFO) as the hard phase and CoFe2O4 spinel ferrite (CFO) as the semi-hard phase. Using a scanning electron microscope (SEM), the morphology and elemental analysis of the NCs were analyzed. The magnetic performances were investigated via a vibrating sample magnetometer at room temperature. With increasing the CFO content and annealing temperature, the hysteresis loop became narrower and possessed semi-hard magnetic properties. The 10 wt. % Co NCs annealed at 800 °C had the highest coercivity of Hc = 4.2 kOe. These results are correlated with switching field distribution plots that have indicated the efficient exchange-spring between SFO and CFO phases NCs annealed at 800 °C. The studied samples can be a promising candidate in permanent magnets and magnetic recording media applications.

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“…19 Vinnik et al 20 synthesized single crystals of SrFe 12 O 19 using Na 2 O flux with coercivity of 4.5 Oe and M s 82 emu/g. Apart from alkali metal halides 21,22 and oxides, 23,24 molten fluxes of sulphates, [25][26][27] and carbonates 20,28,29 have also been used in the synthesis of hexaferrites. One proclaimed advantage of the flux-assisted synthesis method is the possible elimination of the pulverization step in post-synthesis processing of ceramic powders, which otherwise is time and energy-consuming.…”

Section: Introductionmentioning

confidence: 99%

Influence of post‐synthesis NaCl flux treatment on the magnetic properties of jet‐milled SrFe₁₂O₁₉ powders

Mocherla¹,

Ganesan

Prabhu

et al. 2021

J Am Ceram Soc.

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A post-synthesis NaCl flux treatment was carried out on jet-milled strontium hexaferrite, SrFe 12 O 19 powders prepared by conventional high-temperature solidstate reaction starting from SrCO 3 and Fe 2 O 3 . Microstructural studies reveal that the adverse effects of jet-milling on the particle morphology like jagged edges and ruptured surfaces have been effectively mitigated by annealing at elevated temperatures in the presence of molten NaCl flux. The coercivity values obtained from angle-dependent M versus H measurements revealed that the coercivity mechanism in the jet-milled powders is dominated by reverse nucleation due to the strain induced during milling. Annealing the powders in presence of NaCl flux changes the coercivity mechanism to exclusively domain rotation. This results in a dramatic increase of coercivity from 1.6 kOe for the jet-milled powders to a maximum of 5.3 kOe for the flux-annealed powders. XPS studies show that the NaCl flux treatment has not altered the chemical state of Fe.

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Synthesis of aligned La3+-substituted Sr-ferrites via molten salt assisted sintering and their magnetic properties

Cited by 30 publications

References 31 publications

Effect of the neodymium doping on the magnetic and structural properties of the Sr-hexaferrite obtained by the Pechini method

Effect of the neodymium doping on the magnetic and structural properties of the Sr-hexaferrite obtained by the Pechini method

Correlation between Composition and Magnetic Properties of SrFe<sub>12</sub>O<sub>19</sub>/Co Nanocomposite Synthesized by the High Energy Ball-Milling Process

Influence of post‐synthesis NaCl flux treatment on the magnetic properties of jet‐milled SrFe₁₂O₁₉ powders

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Synthesis of aligned La3+-substituted Sr-ferrites via molten salt assisted sintering and their magnetic properties

Cited by 30 publications

References 31 publications

Effect of the neodymium doping on the magnetic and structural properties of the Sr-hexaferrite obtained by the Pechini method

Effect of the neodymium doping on the magnetic and structural properties of the Sr-hexaferrite obtained by the Pechini method

Correlation between Composition and Magnetic Properties of SrFe<sub>12</sub>O<sub>19</sub>/Co Nanocomposite Synthesized by the High Energy Ball-Milling Process

Influence of post‐synthesis NaCl flux treatment on the magnetic properties of jet‐milled SrFe12O19 powders

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Influence of post‐synthesis NaCl flux treatment on the magnetic properties of jet‐milled SrFe₁₂O₁₉ powders