Crystallographic parameters of magnetic Pr 2 Fe 14−x Co x B-type alloys determined using anomalous x-ray diffraction with synchrotron radiation

Galego, Eguiberto; Serna, Marilene Morelli; Ramanathan, Lakshmi; Faria, Rubens Nunes de

doi:10.1016/j.jmmm.2016.10.070

Cited by 3 publications

(2 citation statements)

References 26 publications

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“…Low coercivity values (up to 254 kA/m) were obtained for all the investigated conditions as already observed in literature for melt spun NdFeB alloys[6]. However, the better coercivity was obtained from the sample with bigger strain in the lattice parameter[4]. The hysteresis loops of the all samples (Fig.4a) present a…”

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confidence: 84%

PrFeB Based Alloys Obtained by Melt Spinning for the Production of Permanent Magnets

Meira¹,

Moises

Silva

et al. 2020

MSF

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Rare earth permanent magnets are essential components in many fields of technology due to their excellent magnetic properties. There are some techniques used in the manufacture of permanent rare earth magnets: the powder metallurgy to obtain anisotropic HD sintered permanent magnets and the melt spinning and HDDR processes to obtain isotropic and anisotropic bonded permanent magnets. In this work, the influence of the melt spinning parameters on the microstructural and magnetic properties of the Pr14FebalCo16B6 alloy was studied. The alloy was melted and rapidly cooled at 9.9 x 105°C/s. The parameters used in the process were: wheel speed of 15 m/s and 20 m/s and ejection pressure of 25.3 kPa and 50.7 kPa. Ribbons and/or flakes of 30 μm thickness and width until 5 mm were obtained. Results show that the melt spinning alloys are nanocrystalline and that the parameters of the process influence the microstructure and their magnetic properties. Mean crystallite size up to 38.5 nm and intrinsic coercivity (iHc) up to 254 kA/m were obtained.

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confidence: 84%

PrFeB Based Alloys Obtained by Melt Spinning for the Production of Permanent Magnets

Meira¹,

Moises

Silva

et al. 2020

MSF

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“…As one can see from Table 3, the addition of Co to the alloy composition resulted in the reduction of the unit cell parameters of the 2:14:1phase. It has been frequently reported that the addition of Co to the hard magnetic RE-Fe-B alloys results in changes of their magnetic properties, without the change of the 2:14:1 phase structure type [38][39][40][41]. The Co atoms take the Fe sites in the unit cell of the 2:14:1 phase, resulting in a monotonic decrease of the unit cell parameters.…”

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confidence: 99%

Structural and Magnetic Studies of Bulk Nanocomposite Magnets Derived from Rapidly Solidified Pr-(Fe,Co)-(Zr,Nb)-B Alloy

Pawlik

Wysłocki

et al. 2020

Materials

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In the present study, the phase constitution, microstructure and magnetic properties of the nanocrystalline magnets, derived from fully amorphous or partially crystalline samples by annealing, were analyzed and compared. The melt-spun ribbons (with a thickness of ~30 µm) and suction-cast 0.5 mm and 1 mm thick plates of the Pr9Fe50Co13Zr1Nb4B23 alloy were soft magnetic in the as-cast state. In order to modify their magnetic properties, the annealing process was carried out at various temperatures from 923K to 1033K for 5 min. The Rietveld refinement of X-ray diffraction patterns combined with the partial or no known crystal structures (PONKCS) method allowed one to quantify the component phases and calculate their crystalline grain sizes. It was shown that the volume fraction of constituent phases and their crystallite sizes for the samples annealed at a particular temperature, dependent on the rapid solidification conditions, and thus a presence or absence of the crystallization nuclei in the as-cast state. Additionally, a thermomagnetic analysis was used as a complementary method to confirm the phase constitution. The hysteresis loops have shown that most of the samples exhibit a remanence enhancement typical for the soft/hard magnetic nanocomposite. Moreover, for the plates annealed at the lowest temperatures, the highest coercivities up to ~1150 kA/m were measured.

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Rare–Earths–Cobalt–Boron Compounds

Burzo

2023

Rare Earths-Transition Metals-Boron Compounds

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Crystallographic parameters of magnetic Pr 2 Fe 14−x Co x B-type alloys determined using anomalous x-ray diffraction with synchrotron radiation

Cited by 3 publications

References 26 publications

PrFeB Based Alloys Obtained by Melt Spinning for the Production of Permanent Magnets

PrFeB Based Alloys Obtained by Melt Spinning for the Production of Permanent Magnets

Structural and Magnetic Studies of Bulk Nanocomposite Magnets Derived from Rapidly Solidified Pr-(Fe,Co)-(Zr,Nb)-B Alloy

Rare–Earths–Cobalt–Boron Compounds

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