The effect of praseodymium content on the microstructure and magnetic properties of PrFeCoBNb HDDR magnets

Barbosa, Luzinete Pereira; Takiishi, Hidetoshi; Faria, Rubens Nunes de

doi:10.1016/j.jmmm.2003.08.026

Cited by 8 publications

(8 citation statements)

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“…Two other phases (white and grey) were also found in the alloys containing 16 at% Co (see Fig. 5 for phase identification) and were identified previously [11,12] as Pr 3 Co and Pr(Fe,Co) 2 (Laves phase).…”

Section: Article In Pressmentioning

confidence: 60%

“…All the alloys contain about 0.1 wt% aluminium as an impurity (as per the supplier's specification). Details about the preparation of the HDDR magnets, alloy homogenisation heat treatment and magnetic measurements have been described in previous papers [1][2][3][4][5][6][7]11,12]. Permeameter measurements were carried out after saturation in a pulsed field of 6.0 T. Remanence values were normalized assuming 100% density for the HDDR sample, and by also considering a linear relationship between density and remanence.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, it was shown that the amount of cobalt (Pr 14 Fe 79.9Àx Co x B 6 Nb 0.1 ) has a significant influence on the microstructure of magnetic alloys and on the properties of HDDR magnets [11]. More recently, it was shown that the praseodymium content (Pr x Fe 77.9Àx Co 16 B 6 Nb 0.1 ) also has a great influence in Pr-based alloys and HDDR materials [12]. Similar influence has been obtained with the niobium concentration (Pr 14 Fe 64Ày Co 16 B 6 Nb y ) in these magnets [13].…”

Section: Introductionmentioning

confidence: 99%

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Effect of boron content on magnetic properties and microstructure of PrFeCoBNb HDDR permanent magnets

Barbosa

Takiishi

Lima

et al. 2005

Journal of Magnetism and Magnetic Materials

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Section: Article In Pressmentioning

confidence: 60%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of boron content on magnetic properties and microstructure of PrFeCoBNb HDDR permanent magnets

Barbosa

Takiishi

Lima

et al. 2005

Journal of Magnetism and Magnetic Materials

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“…Praseodymium is a rare earth element with various applications, including magnet production [1], lighting [2], lasers [3], and more. The increasing demand for its manufacturing has driven research into alternative sources of praseodymium [4,5].…”

Section: Introductionmentioning

confidence: 99%

Improved Sorption of Praseodymium Ions From Nitrate Solutions by Activated Ion Exchangers

Jumadilov,

Myrzabay,

Ibragimova

2023

Chem. J. of Kaz.

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In this research, we investigated the praseodymium ions sorption by the ion exchangers KU-2-8 (H+form) and AV-17-8 (OH-form) as an interpolymer system called "KU-2-8:AV-17-8" (X:Y) with the molar ratio of ionic groups X:Y (6:0, 5:1, 4:2, 3:3, 2:4, 1:5, and 0:6) in praseodymium nitrate solution. To be clear, two cross-linked polymers having active functional groups that are in the same solution but not in direct contact form an interpolymer system. The purposeof our research to demonstrate how activating ion exchangers as functional polymers by remote contact in an aqueous medium enhances the sorption of a variety of valuable metals and their compounds from industrial waste solutions, including praseodymium. Objects.Ion exchangers that are mutually activated in an aqueous medium undergo conformational and electrochemical changes that lead to a shift in their state from neutral to highly ionized and an increase in their sorption activity toward target metal ions. Results.The experimental findings showed that the sorption activity of the interpolymer system KU-2-8:AV-17-8 (5:1) increased significantly when compared to praseodymium ions (43 %), but the sorption activity of the raw KU-2-8 (6:0) and raw AV-17-8 (0:6) had the same values of 25 % and 5 %, respectively. Conclusion. This research sheds light on a novel and promising approach to improve the efficiency of ion exchangers, opening possibilities for the effective recovery and removal of valuable metals from complex solutions. Additionally, it holds practical implications for sustainable waste management and resource recycling, contributing to the advancement of environmental protection and resource conservation in various industrial sectors. Further investigations and optimization of the interpolymer system could yield substantial benefits for greener and more resource-efficient future sorption technologies.

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“…As fases formadas no contorno de grão alteram: as interações magnetoestáticas, interações dipolares de longa distância e interações de troca de acoplamento a curta distância entre os grãos da fase magnética (Angelo, 2005). Barbosa et al, (2004Barbosa et al, ( , 2005Barbosa et al, ( , 2004a (3.4)…”

Section: Composição Da Liga (% At) T C (K)unclassified

Estudo de ligas e ímãs preparados pelo processo hidrogenação, desproporção, dessorção e recombinação (HDDR) à base de Pr-Fe-B com adição de dopantes elementos de liga

Galego¹

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À minha esposa Marilene O número explica o universo-Lema dos Pitagóricos i AGRADECIMENTOS Agradeço ao PhD. Rubens Nunes de Faria Jr. pela orientação deste trabalho, pela amizade e apoio. Agradeço ao Dr. José Mestnik Filho pela ajuda e tempo dedicado na etapa dos cálculos teóricos utilizados nesta tese, ao apoio e valiosas discussões. Agradeço à Professora Dra. Helena Maria Petrilli pela ajuda na introdução aos cálculos teóricos (ab-initio), pelo tempo dedicado e por permitir o uso de sua área de processamento de dados no CCE-USP.

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The effect of praseodymium content on the microstructure and magnetic properties of PrFeCoBNb HDDR magnets

Cited by 8 publications

References 8 publications

Effect of boron content on magnetic properties and microstructure of PrFeCoBNb HDDR permanent magnets

Effect of boron content on magnetic properties and microstructure of PrFeCoBNb HDDR permanent magnets

Improved Sorption of Praseodymium Ions From Nitrate Solutions by Activated Ion Exchangers

Estudo de ligas e ímãs preparados pelo processo hidrogenação, desproporção, dessorção e recombinação (HDDR) à base de Pr-Fe-B com adição de dopantes elementos de liga

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