Synthesis of M-type SrFe12O19 by mechanosynthesis assisted by spark plasma sintering

Bolarín-Miró, A.M.; Jesús, F. Sánchez-De; Cortés-Escobedo, C.A.; Torre, S.D. De la; Valenzuela, R.

doi:10.1016/j.jallcom.2014.11.124

Cited by 34 publications

(9 citation statements)

References 28 publications

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“…Those two factors play an important role to reorient the grains. It is important to note that the increase in temperature will increase the activation energy of particles that will assist the reorientation of grains due to the external magnetic flux [ 47 ]. In contrast to the effect of the sintering parameters mentioned above, the sintering temperature shown in Figure 4 d is directly proportional to the mean difference between Mr ǁ and Mr Ʇ in the sense that when the temperature was 920 °C, the mean difference was 9.90.…”

Section: Resultsmentioning

confidence: 99%

Process Optimization of In Situ Magnetic-Anisotropy Spark Plasma Sintering of M-Type-Based Barium Hexaferrite BaFe12O19

et al. 2021

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This paper introduces a new spark plasma sintering technique that is able to order crystalline anisotropy by in-series/in situ DC electric coupled magnetic field. The process control parameters have been investigated on the production of anisotropic BaFe12O19 magnets based on resulted remanence (Mr). Sintering holding time (H.T.), cooling rate (C.R.), pressure (P), and sintering temperature (S.T.) are optimized by Taguchi with L9 orthogonal array (OA). The remanent magnetization of nanocrystalline BaFe12O19 in parallel (Mrǁ) and perpendicular (MrꞱ) to the applied magnetic field was regarded as a measure of performance. The Taguchi study calculated optimum process parameters, which significantly improved the sintering process based on the confirmation tests of BaFe12O19 anisotropy. The magnetic properties in terms of Mrǁ and MrꞱ were greatly affected by sintering temperature and pressure according to ANOVA results. In addition, regression models were developed for predicting the Mrǁ as well as MrꞱ respectively.

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Section: Resultsmentioning

confidence: 99%

Process Optimization of In Situ Magnetic-Anisotropy Spark Plasma Sintering of M-Type-Based Barium Hexaferrite BaFe12O19

et al. 2021

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“…Bolarín-Miró et al [65] carried out a comparative study between M-type strontium hexaferrite prepared from strontium and iron single oxides mechanically activated by high-energy ball milling for 5 h followed by RSPS, and the same milled powder mixture sintered by conventional route. They showed that, in comparison with conventional heat treatment, RSPS process allows the formation of strontium hexaferrite single phase at lower temperatures with a higher magnetization.…”

Section: Hard Magnets: Hexaferritesmentioning

confidence: 99%

Sintering and Reactive Sintering by Spark Plasma Sintering (SPS)

Franceschin¹,

Flores‐Martínez²,

Vázquez‐Victorio³

et al. 2018

Sintering of Functional Materials

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A wide variety of technological applications, especially in electronics, requires high-density nanostructured solids, consolidated by sintering from nanoparticles. A new sintering technique known as spark plasma sintering (SPS) appears as the only method to reach high densities while preserving the final grain size within the nanometric range, with the added advantage of carrying out the process at significantly lower temperatures and shorter times as compared with the classical processes. Recent studies have revealed that in many cases, SPS can also accomplish the solid-state reaction to achieve the desired compound, leading to reactive SPS (RSPS). In this chapter, a review of RSPS is presented, focusing particularly on magnetic oxide materials as functional solids.

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“…Since its discovery in 1950 [3], the hexagonal ferrite type-M SrFe 12 O 19 has played an important role in hard magnetic materials and has been studied for decades due to its good chemical stability, ferrimagnetic behavior, high Curie temperature, high saturation magnetization, high coercivity, high magneto-crystalline anisotropy (MCA), and it is inexpensive compared to similar compounds [4][5][6]. As it has magnetization values of about 60 Am 2 /kg and coercivity of 4.37 × 10 5 A/m, it is widely used in magnetic recording material, data storage devices [7], magneto-optical recordings, microwave devices [8], permanent magnets, and electromagnetic devices [9]. A number of recent studies have considered SrFe 12 O 19 nanoparticles (NPs) in a composite as a promising candidate material for biomedical applications, primarily because of their biocompatibility, an example of which is the treatment for cancer known as magnetic hyperthermia, where heat generated by magnetic nanoparticles in a radio frequency magnetic field is used to destroy malignant cells [10].…”

Section: Introductionmentioning

confidence: 99%

Effect of Sonication Output Power on the Crystal Structure and Magnetism of SrFe12O19 Nanoparticles

et al. 2018

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Abstract:We reported the effect of the sonication output power (SOP), from 120, 180, to 240 W, on the crystal structure, morphology, and magnetic properties of SrFe 12 O 19 nanoparticles synthesized by sonochemical process assisted with heat treatment. X-ray Diffraction analysis of the obtained powder showed the formation of Fe 3 O 4 with low crystallinity degree, which increased with the increase in SOP, together in a crystalline phase identified as SrCO 3 . The formation of SrFe 12 O 19 started at 1073 K, and was completed at 1173 K. However, hexaferrite was obtained with the secondary phases α-Fe 2 O 3 and SrFeO 2.5 . At 1323 K, the secondary phases vanished, and a single phase SrFe 12 O 19 was detected. Vibrating Sample Magnetometry analysis showed that the SrFeO 2.5 phase caused the formation of a hysteresis loop known as the Perminvar magnetic hysteresis loop. At 1323 K, the powder synthesized at 120 W showed a specific magnetization of 67.15 Am 2 /kg at 1.43 × 10 6 A/m, and coercivity of 4.69 × 10 4 A/m, with a spherical-like morphology and average particle size of 56.81 nm obtained by Scanning Electron Microscopy analysis. The increment of SOP promoted a high degree of crystallinity and decrease in crystal size. Additionally, it promoted the formation of secondary phases, induced agglomeration, and modified the morphology of the particles.

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Synthesis of M-type SrFe12O19 by mechanosynthesis assisted by spark plasma sintering

Cited by 34 publications

References 28 publications

Process Optimization of In Situ Magnetic-Anisotropy Spark Plasma Sintering of M-Type-Based Barium Hexaferrite BaFe12O19

Process Optimization of In Situ Magnetic-Anisotropy Spark Plasma Sintering of M-Type-Based Barium Hexaferrite BaFe12O19

Sintering and Reactive Sintering by Spark Plasma Sintering (SPS)

Effect of Sonication Output Power on the Crystal Structure and Magnetism of SrFe12O19 Nanoparticles

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